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View cover and table of contents (in Polish and English) (pdf)

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Inhibition of corrosion of AISI 316L steel in concentrated acetic acid containing NaCl additions

BALA H.
ADAMCZYK L.
OWCZAREK E.
Czestochowa University of Technology, Department of Chemistry, Czestochowa, Poland
GRUETZNER T.
SEYFANG B. C.

LONZA AG, Chemical R&D, Lonzastrasse, CH-3930 Visp, Switzerland

The effect of Akolidine-10 additions (0.001–0.1%) into deaerated, 5M acetic acid solution on corrosion behaviour
of 316L (X2CrNiMo 18-14-3) stainless steel has been investigated in the absence and in presence of NaCl addition.
It can be postulated that Akolidine-10 decreases the hydrogen activity on the steel corroding surface. Additions of
Akolidine-10 into the test solution is particularly advantageous in passive region because it protects steel surface
against local corrosion attack.
Keywords: 316L stainless steel, acetic acid, Akolidine-10, pitting corrosion

2012
Vol.. 55, nr 11
s. 460-463
Ref. 13

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The Study of Ferritic Steel of Crofer 22 APU Type at High Temperatures in Argon and Air
Atmosphere Containing Water Vapor

CHMURA E.

ŻUREK Z.
JAROŃ A.
STAWIARSKI A.

Faculty of Chemical Engineering and Technology, Cracow University of Technology, Poland

This paper presents results of the behavior of ferritic steel of Crofer 22 APU type in air and argon atmospheres containing water vapor at high temperatures. The effect of water vapor content on the kinetics of oxidation at 1073 K was examined. Water vapor content ranged 1–100%. Total exposure time of each sample was 100 h. Phase and chemical compositions of the formed scales were investigated by XRD and SEM/EDS. The rate of oxidation of Crofer 22 APU steel is varying and depends on the content of water vapor in the atmosphere at a temperature of 1073 K. Phase and chemical compositions in almost the all studied atmospheres were the same.
Keywords: steel Crofer 22 APU, corrosion, oxidation, SOFC

2012
Vol.. 55, nr 11
s. 464-466
Ref.14
 

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Influence of Cobalt Content on the Process of Hydrogen Evolution on the Ni-Co Porous Electrode
 

JAROŃ A.
ŻUREK Z.

Faculty of Chemical Engineering and Technology, Cracow University of Technology, Poland

The presented paper discusses an influence of cobalt content in the nickel powder sintered electrode on electrochemical
processes of hydrogen production. The studies of a samples surface were conducted with the use of SEM/EDX technique. The electrochemical properties of porous Ni-Co electrodes were examined by potentiostatic method. The authors applied a rotating electrode during those tests. The current-potential relationship was obtained at 40oC in 1 molar KOH with Hg|HgO reference electrode, i.e. under conditions similar to the industrial process of hydrogen
production.

2012
Vol.. 55, nr 11
s. 467-469
Ref.17

 

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Protective properties of modified PEDOT/ABA/PMo12 composite coatings on stainless steel

 

ADAMCZYK L.
PIETRUSIAK A.

Katedra Chemii, WIPMiFS, Politechnika Częstochowska

In the presence work the usefulness of composite coatings of poly(3,4-ethylenedioxythiophene) and 4-aminobenzoic acid doped with phosphomolybdic acid heteropolyanions for protection of X20Cr13 stainless steel against corrosion is discussed. The coatings have been obtained by the cyclic woltamperometry method from aqueous micellar solutions containing sodium dodecysulphate. Protective properties of composite coatings were evaluated in the acidified sulphate solutions containing chloride ions.
Keywords: 4-aminobenzoic acid, conducting polymers, poly(3,4-ethylenodioxythiophene), anticorrosion coating, corrosion protection, stainless steel

2012
Vol.. 55, nr 11
s. 470-472
Ref.17

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Diffusitivity and efficiency of hydrogen electrosorption for zinc – doped La(Ni,Co,Al)5 alloys

 

ADAMCZYK L.
GIZA K.
BALA H.
Katedra Chemii, Politechnika Częstochowska, Częstochowa

DRULIS H.

Instytut Niskich Temperatur i Badań Strukturalnych PAN, Wrocław

This paper presents electrochemical characteristics of LaNi4,3Co0,4Al0,3 type hydrogen storage alloy doped with 1.7 at % Zn in positions of Ni or Al. The electrochemical tests have been carried out with a use of chronoammetric charge/discharge technique to determine efficiency of hydrogen electrosorption and hydrogen diffusivity parameter. It is shown that clearly better hydrogenation properties are obtained in case of partial substitution of Al
Keywords: hydrogen storage alloys, discharge capacity, hydrogen diffusion coeffi cient

2012
Vol.. 55, nr 11
s. 473-476
Ref.30

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The influence of chemical treatment of Ti0,80Zr0,20Mn1,50V0,35 powder material on hydrogen absorption 

GIZA K.
KUKUŁA I.
Katedra Chemii, Politechnika Częstochowska, Częstochowa
DRULIS H.
HACKEMER A.

Instytut Niskich Temperatur i Badań Strukturalnych PAN, Wrocław

The effect of the etching and encapsulation of Ti0,80Zr0,20Mn1,50V0,35 powder particles with Ni or Cu coating on the electrochemical hydrogen absorption/ desorption process of obtained composite epoxy bonded material has been evaluated. The investigation was performed in 6M KOH, for two different temperatures using the galvanostatic charge/ discharge measurements. It was found that the tested alloy before surface modification was hardly hydrogenated in KOH electrolyte. Etching and encapsulation improve hydrogen absorption ability of the alloy, however, the improvement is insufficient.
Keywords: Ti0,80Zr0,20Mn1,50V0,35 alloy, composite electrode, particles encapsulation, hydrogen absorption/ desorption

2012
Vol.. 55, nr 11
s. 476-479
Ref.22

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Influence of passivator addition on corrosion resistance of composite layers type: nitrided layer and zinc-iron phosphates coating 

BROJANOWSKA A.
KULIKOWSKI K.
WIERZCHOŃ T.
Wydział Inżynierii Materiałowej Politechniki Warszawskiej

Hybrid technologies, combining various surface treatment processes, belong to the most dynamically developing surface engineering methods as they enable creation of surface layers having unique, complementary properties.The article presents structure (optic microscopy, SEM, XRD) and results of corrosion resistance investigation (open circuit potential measurement, electrochemical impedance spectroscopy, potentiodynamic method) of composite layers on X37CrMoV5-1 steel after heat treatment (hardness 53HRC) produced in the hybrid process combining glow discharge assisted nitriding and chemical phosphating methods. These are the layers of the following type (starting from the surface): zinc-iron phosphates (6 μm thickness) – iron nitrides Fe4N and Fe2-3N – nitrogen in iron solution zone. Composite layers were modified by impregnating with oxidizing inhibitor IKOROL produced by Faculty of Chemistry Warsaw University of Technology. Influence of passivator on corrosion resistance of composite layer was examined.
Keywords: EN X38CrMoV5-1 steel, glow-discharge nitriding, chemical phosphating, composite layers, zinc phosphate coating, corrosion resistance

2012
Vol.. 55, nr 11
s. 480-485
Ref. 12

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Corrosion properties of the composite type aluminium alloy A359-SiC after multiple melting processes

 

GROBELNY M.
KLASIK A.
Instytut Transportu Samochodowego, Warszawa

The paper presents the results of mechanical and corrosion research of the 359 aluminum alloy matrix containing 10, 20 and 30 vol. % of SiC particles alter multiple melting processes, that is, after recycling. Aluminium alloy-SiC particles composites in automotive industry can be applied as material for brake disc and piston. The study of the mechanical properties was carried out during the static tensile test and corrosion resistance was carried out by voltammetric method (polarization curves). The tested materials are characterized by similar corrosion resistance in 0.5 M Na2SO4, pH = 6 electrolyte solution. However, the process of multiple melting causes a gradual deterioration of mechanical properties.
Keywords: corrosion resistance, aluminum, composite materials, strength

2012
Vol.. 55, nr 11
s. 486-488
Ref. 4

 

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Corrosion processes of lead-free solders SnZn type

GROBELNY M.

Instytut Transportu Samochodowego, Warszawa
SOBCZAK N.
Instytut Transportu Samochodowego, Warszawa
Instytut Odlewnictwa, Kraków

The development of lead-free solders has become an important task for material scientists, mainly due to health and environmental concerns induced by the lead content of conventional solders. The corrosion resistance of the next generation solders is one of the key factors responsible for reliability of solder joints. The paper focuses on the comparative studies of corrosion behaviour of Pb-free solder candidates of binary Sn-Zn systems and commercial alloy Sn-Ag-Cu (SAC305). The tests were done by means of voltametric and electrochemical impedance spectroscopy measurements carried out in the sulfate solution (pH = 2).
Keywords: corrosion resistance, electrochemical methods, lead-free solders

2012
Vol.. 55, nr 11
s. 488-490
Ref.11

 

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Structure of outer layer of stainless steels after high-temperature chemical treatments and their susceptibility to local corrosion

 

JAGIELSKA-WIADEREK K.
Katedra Chemii, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej,
Politechnika Częstochowska

Structure of outer layer of stainless steels after high-temperature chemical treatments and their susceptibility to local
corrosion Thermo-chemical treatment of stainless steels is an important way to improve the hardness and strength of the surface. These processes, however, introduce structural changes that are not always favorable from the point of view of their resistance to corrosion. The potentiokinetic tests for AISI 405 stainless steel were carried out in acidified 0.5 M sulphate (pH = 4) solutions containing 0.5M of chloride ions. A method of step-by-step consecutive thinning of surfacial layers of the carburized and carbonitrided steels has been used to determine the depth profiles of their pitting- and repasivation potentials. The thickness of the resulting layers was evaluated on the basis of the spectrophotometric analysis of carbon content and microhardness on the cross section of the chemically and heat-treated material.
Keywords: local corrosion, depth profile, stainless steel, carbonitriding, carburization, fluid flow

2012
Vol.. 55, nr 11
s. 491-494
Ref 19

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Corrosion resistance of AM50 magnesium alloy matrix composite reinforced with SiC particles

KAMIENIAK K.

MALIK M.

Katedra Chemii, WIPMiFS, Politechnika Częstochowska

In present work, the microstructure of the composite based on AM50 magnesium alloy matrix reinforced with SiC particles was characterized. The composite containing 10 wt. % of SiC was fabricated by means of gravity casting. The corrosion resistance of the obtained composite was compared with the corrosion resistance of the matrix alloy in a solution of 0.5 mol dm3 NaCl saturated with Mg(OH)2. The results of performed electrochemical measurements revealed that the corrosion rate of the investigated composite was about two orders of magnitude higher than the corrosion rate of the matrix alloy. This conclusion was confirmed by hydrogen evolution rate measurements.
Keywords: magnesium matrix composites, SiC, AM50 magnesium alloy, corrosion of magnesium matrix composites

2012
Vol.. 55, nr 11
s. 495-498
Ref.16

 

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The influence of deep cryogenic treatment on protective properties of nitrided X153CrMoV12 steel

KAPUŚCIŃSKA A.

WACH P.
CISKI A.
Instytut Mechaniki Precyzyjnej, Warszawa
BURDYŃSKA S.
Wojskowa Akademia Techniczna, Warszawa

The aim of the paper is to present the properties of nitrided layers subjected to deep cryogenic treatment (DCT) and the impact of this process on the corrosion resistance of nitrided tool steel. On X153CrMoV12 steel the nitrided layer was formed, consisting of a diffusion zone with a thickness of about 110 microns and the subsurface layer of iron nitrides with a thickness of about 15–17 microns. DCT process didn't cause any significant change in the thickness or hardness of the subsurface layer of iron nitrides and diffusion zone. However, DCT caused homogenization of the superficial layer, DCT of nitrided steel increased the protective properties of the material in sulphate and chloride solution
Keywords: thermo-chemical treatment, deep cryogenic treatment, corrosion resistance, nitriding

2012
Vol.. 55, nr 11
s. 499-501
Ref. 9

 

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Structure, chemical composition and corrosion resistance of oxide coatings obtained on AZ61 alloy by anodic oxidation process

KAPUŚCIŃSKA A.

KWIATKOWSKI L.
Instytut Mechaniki Precyzyjnej, Warszawa
BAŁKOWIEC A.
Materials Engineers Group Sp. z o.o.
LUTZE R.
Instytut Mechaniki Precyzyjnej, Warszawa
MICHALSKI J.
Materials Engineers Group Sp. z o.o.
TOMASSI P.
Instytut Mechaniki Precyzyjnej, Warszawa

Two kinds of DC anodising processes has been applied to AZ61 alloy. One of the coating is obtained from SiO32-/F- based solutions, another one from KOH/F- solution. Surface examination carried out using microscopic and X-ray methods revealed two different structures of the coatings: low and high porous respectively. Impedance measurements were carried out for AZ61 magnesium alloy after immersion in sodium sulphate. Although higher resistance against corrosion for samples anodized in Si-based solution was obtained, initial impedance for high porous layer (KOH/F-) was also noted. Sealing post-treatment was found as a mean for excellent properties of thin oxide film on AZ61 alloy.
Keywords: Mg alloys, anodic oxidation, corrosion, microstructure, sealing, impedance measurements

2012
Vol.. 55, nr 11
s.502-504
Ref. 3

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Effect of the Nd(Fe,Co)B powder biencapsulation with Ni-P coatings on the corrosion resistance of bonded magnets in the environments of artificial saliva and ringer solution

KLIMECKA-TATAR D.

Politechnika Częstochowska, Wydział Zarządzania, Instytut Inżynierii Produkcji
PAWŁOWSKA G.
Politechnika Częstochowska, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej,
Katedra Chemii
SZYMURA S.
Państwowa Wyższa Szkoła Zawodowa w Nysie
RADOMSKA K.
Politechnika Częstochowska, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej,
Katedra Chemii

Investigations under the effect of the powder particles biencapsulation with NiP/epoxy resin coating on corrosion characteristics of the final bonded magnetic material have been carried out. As corrosion environments the physiological body fluids have been applied. The test material were composite magnets prepared from Nd(Fe,Co)B powder, which surface was coated with NiP layer during 5, 15 and 30 minutes of Ni(II) modyfication solution bath. To evaluate corrosion behaviour of the bonded material the potentiokinetic polarization curves in artificial saliva and Ringer solution have been compared. It is shown that the biencapsulation before the consolidation process has its beneficial effect on corrosion behaviour of the final magnet.
Keywords: biencapsulation, bonded magnets, Ni-P coating, artificial saliva, Ringer solution

2012
Vol.. 55, nr 11
s.505-508
Ref. 19

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Anodic dissolution and corrosion behaviour of stainless steels in Ringer's solution

KASPRZYK D.

STYPUŁA B.
AGH - Akademia Górniczo-Hutnicza w Krakowie, Wydział Odlewnictwa,
Katedra Chemii i Korozji Metali, Kraków

This paper presents results of study the corrosion behavior of stainless steels: commercial one (S30403, S31603), with high content of silicon (S32615) and austenitic-ferritic duplex steel (S32404) in Ringer's solution at temperature of 37oC. Corrosion behavior of the samples were studied on the base of polarisation curves LSV (linear sweep voltammetry), chemical analysis of the corrosion medium using atomic adsorption spectroscope (AAS) and surface analysis by use scanning electron microscope (SEM/EDS).

Keywords: stainless steel, corrosion resistance, Ringer's solution

 

2012
Vol.. 55, nr 11
s.508-510
Ref. 8

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Evaluation of oxidation resistance of high-aluminum cast iron

 

KOPYCIŃSKI D.
GILEWSKI R.
AGH - Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

The main structural component in high aluminum cast iron is eutectic and hypereutectic carbide Al4C3. Ti additions promote the formation of TiC as the primary phase, but the eutectic constituent is still Al4C3. Further Ti additions lead to total replacement of the eutectic Al4C3 by TiC. In this case, at Ti mass fractions 5%, Al4C3 is totally replaced by TiC. In addition, this work indicates that the high-aluminum cast iron alloy posses high oxidation resistance, exceeding that of high-chromium cast iron and chromium cast steels.

Keywords: high-aluminum cast iron, oxidation resistance , TiC, Al4C3

2012
Vol.. 55, nr 11
s.511-513
Ref. 9

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The influence of ductile cast iron structure on zinc coating during galvanizing of castings

KOPYCIŃSKI D.

GUZIK E.
SZCZĘSNYA.
AGH - Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

The growth kinetics of the zinc coating formed on the surface of casting made from ductile iron grade EN-GJS-500-7 was investigated. To produce homogenous metal matrix in test samples, the normalising and ferritising annealing was carried out. Studies showed a heterogeneous structure of cast iron with varying content of the phases formed. This was followed by hot dip galvanizing treatment at 450°C to capture the growth kinetics of the zinc coating (the time of the treatment ranged from 60 to 600 seconds). Nonlinear estimation of the determined growth kinetics of the alloyed layer of a zinc coating was made and an equation of the zinc coating growth was derived. Based on the results of the investigations it was concluded that thickness of the zinc coating formed on the surface of casting with a 100% pearlitic matrix makes 50% of the thickness of coating formed on the surface in 100% ferritic.
Keywords: galvanising, zinc coating, ductile cast iron.

2012
Vol.. 55, nr 11
s.513-515
Ref. 12

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Characteristics of anodic materials used for the electrochemical injection of steel corrosion inhibitors into concrete

KRÓLIKOWSKI A.

ŻUCHOWSKI P.

Wydział Chemiczny, Politechnika Warszawska

Different anodic materials, namely graphite, stainless steel, activated titanium and platinum, have been used in trials of the electrochemical injection of corrosion inhibitors into concrete. Anodic polarization curves of these materials were taken in solutions simulating anolite, typical for these processes. Occurring anodic reactions were revealed upon the analysis of acquired polarization data. In conclusion, the usability of tested anodic materials for the electrochemical injection of the anionic corrosion inhibitor (nitrite ions) into concrete was assessed.
Keywords: reinforced concrete, anionic inhibitor, electrochemical injection, anode

2012
Vol.. 55, nr 11
s.516-517
Ref. 13

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Polarization characteristics of the La2Ni8Co0,8Al0,2Mg alloy produced with the use of mechanical alloying method

KUKUŁA I.

BALA H.
Katedra Chemii, Wydz. IPMiFS, Politechnika Częstochowska
DRULIS H.
HACKEMER A.

 

Instytut Niskich Temperatur i Badań Strukturalnych PAN, Wrocław

Polarization characteristics of sintered, multiphase La2Ni8Co0,8Al0,2Mg hydrogen absorbing alloy obtained by mechanical alloying (MA) method have been compared with these of massive LaNi5 reference compound in 6M KOH environment. The alloy produced by MA method exhibits one order of magnitude greater rates of hydrogen evolution and currents in passive range compared with LaNi5. A strong progress of material oxidation as a result of anodic polarization may result from its multiphase nature, discontinuity of the passive layers formed and structural porosity. A new parameter, called a coefficient of passive layer growing, has been proposed to characterize the alloy ability to efficient passivation
Keywords: hydrogen absorbing materials, mechanical alloying, polarization characteristics, passivation

 

2012
Vol.. 55, nr 11
s.518-521
Ref. 27

 

 

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Characterizations of corrosive properties of nickel nanocomposite surface layers produced by electrochemical method

KUCHARSKA B

Politechnika Warszawska, Wydział Inżynierii Materiałowej
TRZASKA M.
Instytut Mechaniki Precyzyjnej, Warszawa

 

This paper presents the results of studies on corrosion resistance of nanocrystalline nickel Ni and composite layers of Ni/PTFE, Ni/Si3N4, Ni/PTFE/Si3N4 structures produced by electrochemical method on aluminum substrate. By scanning electron microscopy (SEM) was carried out structural analysis of the layers. For researches of corrosive properties of nickel and composite layers were implemented potentiodynamic and electrochemical impedance spectroscopy methods. Current characteristics j = f(E), corrosion current density, corrosion potentials and impedance spectra in the form of Nyquist and Bode diagrams are presented. For the interpretation of impedance spectra were determined equivalent electrical circuits and their components specified parameters are determined.
Keywords: composite coatings Nif/PTFE, Ni/PTFE/S3iN4, corrosion resistance, polarization, impedance spectroscopy

 

2012
Vol.. 55, nr 11
s.522-524
Ref. 8

 

 

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Effect of microstructure on corrosion rate for selected grades of low-alloy high wear resisted steels with boron

ŁĘTKOWSKA B.

DUDZIŃSKI W.
Instytut Materiałoznawstwa i Mechaniki Technicznej, Politechnika Wrocławska
KLAKOČAR-CIEPACZ M.

 

Instytut Technologii Nieorganicznej i Nawozów Mineralnych, Politechnika Wrocławska

The results of electrochemical study in an environment of 3% NaCl of low-alloy boron steel B27 for the delivery state and some states after heat treatment were presented. Following this study the influence of microstructure on the value of corrosion rate and on corrosion mechanisms was defined.
Keywords: low-alloy boron steel, corrosion rate, heat treatment, electrochemical study, microstructure

 

2012
Vol.. 55, nr 11
s.525-527
Ref. 4

  

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Evaluation of the protective properties of aging silane coatings on iron

OWCZAREK E.

ADAMCZYK L.

 

Katedra Chemii, Politechnika Częstochowska

Organosilane compounds are applied to improve the adhesion of organic coatings (paints, lacquers) to metals. These substances can also inhibit corrosion processes of metal surface. In the presents work, protective properties of thin air aged coatings of isobutylotrietoksysilane (IBTES) prepared on iron in weak alkaline solutions containing anions:
Cl- HCO3-, CO32-, SO42- were examined. It was found that IBTES coatings inhibit the corrosion of iron substrate and their protective properties improve with the time of aging in the air as well after exposure in alkaline solution containing ammonia.
Keywords: organofunction silane, films aging, corrosion resistance, Armco iron

2012
Vol.. 55, nr 11
s.528-530
Ref. 17

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The effect of RE-M-B powder particles isolation on the corrosion rate of bonded materials in acidified sulphate solution

PAWŁOWSKA G.

Katedra Chemii, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej,
Politechnika Częstochowska
KLIMECKA-TATAR D.
Instytut Inżynierii Produkcji, Wydział Zarządzania, Politechnika Częstochowska
MAZIK A.
Katedra Chemii, Wydział Inżynierii Procesowej, Materiałowej i Fizyki Stosowanej,
Politechnika Częstochowska

The investigation under encapsulation of the Nd(Fe,Co)B powder particles with Ni-P/epoxy resin coatings and phosphate/epoxy resin on the corrosion behavior of bonded materials obtained on their base in the acidified sulphate environment have been carried out. The Ni-P coatings were prepared in electroless bath containing salt of Ni (II) and sodium diphosphite, by 5, 15 and 30 minutes of exposure. the phosphate/epoxy resin coatings were obtained by powder conditioning in phosphate solutions acidified to pH = 3 or 7. It was found that the powder biencapsulation increased the corrosion resistance of the bonded materials, with the best results in the case of the phosphate coatings formed in the acidified phosphate environment.
Keywords: RE-M-B powder particles biencapsulation, kinetic etching curves, Ni-P coating, phosphate coating

2012
Vol.. 55, nr 11
s.531-533
Ref. 26

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Electroless metallization of carbon fibers from solutions in various temperatures

SAŁACIŃSKA A.

KOZERA R.
BOCZKOWSKA A.
Zakład Materiałów Ceramicznych i Polimerowych, Wydział Inżynierii Materiałowej Politechniki Warszawskiej
BIELIŃSKI J.

Katedra Chemii Nieorganicznej i Technologii Ciała Stałego, Wydział Chemiczny Politechniki Warszawskiej

In this paper the studies on lowering of solutions temperature for carbon fibers electroless metallization process with Ni-P layers was presented, which allows applying these conditions in metallization of 2D and 3D fabrics. The process was carried out with solution of pH 8,5 containing: glycine, sodium hypophosphite and nickel sulfate. The temperature of metallization was decreased to 50oC which gave under applied conditions (metallization time 15 min) increasing in metallization rate, suitable in the case of fabrics metallization. Despite of significant reduction of metallization rate continuous layers was obtained with good adhesion to the substrates and uniform thickness.
Keywords: electroless nickel, carbon fibers, Ni-P protective layer

2012
Vol.. 55, nr 11
s.534-535
Ref. 15

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Investigations on the morphology and chemical composition of chromium-free conversion coatings deposited from the bath contained H2ZrF6 modified with the 3-aminopropyltriethoxysilane additive

WINIARSKI J.

SZCZYGIEŁ B.

Instytut Technologii Nieorganicznej i Nawozów Mineralnych, Politechnika Wrocławska

The Zr-containing conversion coatings were obtained. The coatings were deposited on zinc coated steel from the solution contained i.e. H2ZrF6 and 3-aminopropyltriethoxysilane. The results of microscopic analysis showed that the coatings are homogeneous and rather porous, and the morphology is not affected by the deposition time which was changed in the range of 20 s – 180 s. By means of X-ray photoelectron spectroscopy the chemical composition was determined (Zr, O, C, Zn, F, Si, N) and the film-forming compounds were proposed.
Keywords: zinc coating, conversion coating, chromating, SEM, XPS

2012
Vol.. 55, nr 11
s.536-540
Ref. 16

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Corrosion resistance of chromium-free conversion coatings deposited from the bath contained H2ZrF6 modified with the 3-aminopropylotriethoxysilane additive

WINIARSKI J.

SZCZYGIEŁ B.

Instytut Technologii Nieorganicznej i Nawozów Mineralnych, Politechnika Wrocławska

This paper presents the results of research on Zr-containing conversion coatings. The coatings were deposited on zinc substrate from the solution contained H2ZrF6 as a source of Zr and 3-aminopropyltriethoxysilane. The effect of deposition conditions (bathe temperature and immersion time) on their corrosion resistance (DC polarization measurements in 0.5 M NaCl, salt spray test) was investigated. Coatings deposited from the proposed bath increase the corrosion resistance of zinc electrogalvanized steel and the resistance is affected by the increase in deposition time. The lowest corrosion current density values were recorded for the coatings deposited at T = 25°C in t = 20÷60 s.
Keywords: zinc coating, conversion coating, chromating, corrosion resistance

2012
Vol.. 55, nr 11
s.541-543
Ref. 9

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The production and corrosion properties of Zn-Mn coatings

WYKPIS K.

PANEK J.
BIERSKA-PIECH B.

Uniwersytet Śląski, Instytut Nauki o Materiałach, Katowice

The Zn-Mn coatings were obtained under galvanostatic conditions, from a sulfate-citrate bath. The surface morphology, phase and chemical composition and the corrosion resistance of deposited coatings were investigated. It was found that these properties of the Zn-Mn coatings depends on both current conditions of deposition and Mn2+ ions concentration in a galvanic bath. The possibility of obtaining of electrolytic Zn-Mn coatings containing from 0,2 to 9% at. of manganese was shown. The Zn-Mn coating containing 9% at. Mn, deposited at current density j = 50 mA•cm-2 from the bath with higher concentration of Mn2+ ions (0,9 M) showed the highest corrosion resistance among the investigated Zn-Mn coatings.
Keywords: Zn-Mn coatings, electrodeposition, corrosion resistance

2012
Vol.. 55, nr 11
s.544-545
Ref. 8