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„Ochrona przed Korozją” (Corrosion Protection) No. 05/2016

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

 

DOI: 10.15199/40.2016.5.1

High-temperature oxidation of silicide-coated C-103 alloy with a diffusion barrier layer

PRZELIORZ R.

Politechnika Śląska

SWADŹBA R.

Instytut Metalurgii Żelaza

SWADŹBA L.

WITALA B.

MENDALA B.

Politechnika Śląska, Instytut Nauki o Materiałach

Commercial C-103 niobium alloy with a silicide layer modified by a diffusion barrier layer was oxidised. The protective layer was produced by the pack cementation method. The oxidation process was carried out in a temperature range of 950÷1100oC in an atmosphere of oxygen. It was found that the silicide layer modified by the diffusion barrier layer led to a significant improvement of resistance to oxidation of the C-103 niobium alloy compared to the unmodified silicide layer.

Keywords: silicide layers, pack cementation method, oxidation, protective layers, C-103 alloy

2016

Vol. 59, nr 5

s. 143-147

Ref. 14

 


 

DOI: 10.15199/40.2016.5.2

Resistance of concrete with ordinary and low-alkali Portland cement to chloride ingress

SZWEDA Z.

Faculty of Civil Engineering, the Silesian University of Technology, Gliwice

This paper shows results from tests on resistance of ordinary concrete, which differed in a type of used cement, to chloride ingress. Two concrete specimens containing Portland cement proposed for use in transport infrastructure engineering, were compared. Concrete C1 with Portland cement CEM I 42,5 R, and concrete C2 – Portland cement with low alkaline content CEM I 42,5 N/SR3/NA. Resistance to chloride ingress was determined by calculating values of diffusion coefficients from the thermodynamic model of chloride flow under the electric field.

Keywords: concrete resistance to chloride ingress, diffusion, migration, diffusion coefficient, ordinary Portland cement, lowalkali Portland cement

2016

Vol. 59, nr 5

s. 148-153

Ref. 13

 


 

DOI: 10.15199/40.2016.5.3

Hard anodic coatings on duralumin

NAWRAT G.

LACH G.

NIEUŻYŁA Ł.

Silesian University of Technology, Faculty of Chemistry, Gliwice

NOWAK P.

J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków

Paper presents the results of the investigations on the preparation of oxide coatings on aluminum alloy EN AW-2017A containing 3.5÷4.5% of copper as the main alloying component by anodic oxidation. Anodization was conducted in the baths composed of sulfuric(VI) acid, oxalic acid, tartaric acid and binary mixtures of these acids. Thickest coatings, showing at the same time best corrosion resistance, at the same electrolysis charge were obtained using the baths containing sulfuric(VI) acid or sulfuric(VI) acid with the addition of tartaric acid, at the temperature of 0oC.

Keywords: aluminum alloys for plastic working, anodizing, hard oxide coatings

2016

Vol. 59, nr 5

s. 154-159

Ref. 12

 


DOI: 10.15199/40.2016.5.4

Corrosive resistance of 316L stainless steel covered with SiO2 coatings deposited by sol-gel method in a simulated body fluid

MAZUR A.

CHĘCMANOWSKI J.

SZCZYGIEŁ B.

Faculty of Chemistry, Department of Advanced Material Technologies,

Wroclaw University of Science and Technology

Three-layer ceramic SiO2 coatings were deposited on steel 316L, from a sol containing tetraethoxysilane as well as isopropyl alcohol and butyl alcohol as the solvents. The exposure of the samples to a Simulated Body Fluid (SBF) for 142 days showed that the samples with the SiO2 coating were more corrosion resistant than the uncoated steel. When isopropyl alcohol was used as a component of the sol the corrosion resistance of the samples increased fourfold. Ceramic SiO2 coatings form a barrier layer and, as shown by EDS analyses, favour the formation of a hydroxyapatite layer. The ratio of Ca and P peak sizes measured in the surface layer of the coated samples corresponds to the ratio of these elements which occurs in synthetic hydroxyapatites.

Keywords: sol-gel method, SiO2 coating, biocompatibility, corrosion resistance

2016

Vol. 59, nr 5

s. 160-166

Ref. 15

 


 

DOI: 10.15199/40.2016.5.5

Influence of electrolyte on capacity and corrosion resistance of anode material used in Ni-MH cells

GIZA K.

Czestochowa University of Technology, Dept. Chemistry,

Faculty of Production Engineering and Materials Technology

The electrochemical capacity and corrosion resistance of the La2Ni9CoSn0.2 alloy in two different electrolytes (KOH and LiOH) at the same concentration (6 mol·dm-3) has been investigated. Higher values of capacities for the electrode during activation have been obtained in KOH solution. The corrosion current density and corrosion potential of La2Ni9CoSn0.2 alloy indicate that the electrode worked in KOH solution has a better anti-corrosion ability. The decrease of the electrochemical capacity of the alloy observed in LiOH solution can result from accelerated corrosion of the electrode material in this environment.

Keywords: Hydrogen storage alloy, electrolyte, electrochemical properties

2016

Vol. 59, nr 5

s. 167-169

Ref. 18

 


 

DOI: 10.15199/40.2016.5.6

Testing with EIS technique to compare the effect of alkaline pH of concrete pore solution on rebars with or without zinc coating

JAŚNIOK M.

KOŁODZIE J J.

Department of Building Structures at the Silesian University of Technology

This paper describes an attempt to perform the experimental evaluation to compare the effect of alkaline pH of concrete pore solution on rebars protected with hot dip galvanized (HDG) zinc coatings and without the protection. Specimens for tests were prepared from smooth bars with the diameter of 8 mm, each made of St3S reinforcing steel. Zinc baths of different time resulted in different thickness of protective coats on steel. For comparative purpose, some rebars had not zinc coating. Corrosion testing was performed by electrochemical impedance spectroscopy in the three-electrode system. During measurements steel specimens remained in contact with synthetic pore solution with pH of 13.4. During two weeks, three series of impedance measurements were conducted at 7-day intervals for specimens with 100 μm and 50 μm coats and uncoated steel specimen. The test results confirmed entirely different behaviour of galvanized and non-galvanized steel in concrete pore solution at high pH. The performer analysis demonstrated no evidence of corrosion in non-galvanized specimen immersed in the tested pore liquid, and very intensive corrosion of galvanized specimens during first days of their contact with the liquid. Moreover, a 7-day exposure to the pore solution inhibited corrosion on the specimen with a 100 μm zinc coating, whereas the process observed on the specimen with a 50 μm zinc coating, was inhibited after two weeks.

Keywords: concrete structures, reinforcing steel, hot dip galvanized (HDG) zinc coating, synthetic concrete pore solution, corrosion, electrochemical impedance spectroscopy, EIS

2016

Vol. 59, nr 5

s. 170-174

Ref.. 14

 


 

DOI: 10.15199/40.2016.5.7

Smectite sorbents designed for the removal of H2S from corrosive atmospheres

JAROŃ A.

KUC A.

WZOREK Z.

ŻUREK Z.

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

Multilayered clay minerals have been widely studied as potential sorbents for the absorption of various gases including the aggressive ones that cause corrosion. In the present work smectite 2:1 (Krzeniów deposits) has been used as the base material for obtaining sinters – ceramic sorbents. The absorption process of H2S was studied on a smectite sinter deposit using a mixture of Ar/H2S gases containing 450 ppm of hydrogen sulfide. Morphology of the obtained sorbents was determined with the use of SEM. The chemical and phase composition of sorbents were examined with EDX, XRF, and XRD techniques. Sulfur concentration in sorbent after work in an atmosphere containing H2S was determined by XRF technique. Research findings have shown that an increase in sintering temperature of ceramic sorbents based on smectite unfavourably influences their ability to absorb H2S.

Keywords: smectite sorbents, sintering, H2S

2016

Vol. 59, nr 5

s. 176-181

Ref. 20

 


 

DOI: 10.15199/40.2016.5.8

Review of modern monitoring techniques of cathodic protection effectiveness of industrial objects

SOKÓLSKI W.

Anticorrosion Technologies – Cathodic Protection Engineering CORRPOL Gdańsk, Poland

The review of effectiveness monitoring techniques being applied today of steel object cathodic protection systems, mainly elements of municipal and industrial infrastructure is presented. Lack of possibility of direct visual assessment of anti-corrosion protection and cathodic protection current action is a significant inconvenience of application of this anti-corrosion technology. Hence, novel methods of corrosion process effectiveness assessment of underground and underwater objects have been elaborated and implemented with progress and development of technology. In the elaboration a historical outline has been presented of development of effectiveness monitoring methods of cathodic protection systems and techniques being applied today have been presented in engineering practice examples.

Keywords: cathodic protection, effectiveness assessment, monitoring, industrial objects

2016

Vol. 59, nr 5

s. 182-186

Ref. 7

 


 

DOI: 10.15199/40.2016.5.9

Influence of processing parameters on the microstructure, mechanical properties and corrosion behaviour in Ringer’s solution of Co-Mo coatings electrodeposited on pure Co

LATKIEWICZ M.

AGH – University of Science and Technology, ul. Reymonta 23, 30-059 Krakow, Poland

ICB, UMR 6303 CNRS – Université Bourgogne-Franche Comté, BP 47870, 21078 Dijon, France

KRAWIEC H.

AGH – University of Science and Technology, ul. Reymonta 23, 30-059 Krakow, Poland

VIGNAL V.

ICB, UMR 6303 CNRS – Université Bourgogne-Franche Comté, BP 47870, 21078 Dijon, France

The microstructure and the corrosion behaviour in the Ringer’s solution of Co-Mo coatings electrodeposited on pure Co is investigated using a microcapillary with a diameter of 300 μm. The presence of defects (cracks and pores) and the oxygen content are important parameters affecting the electrochemical behaviour of coatings.

Keywords: corrosion, microstructure, Co-Mo coatings

2016

Vol. 59, nr 5

s. 187-190

Ref. 12