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„Ochrona przed Korozją” (Corrosion Protection) No 05/2017

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

 

DOI: 10.15199/40.2017.5.1

Plasma electrolytic oxidation of magnesium alloy AZ91D

NAWRAT G.

Silesian University of Technology, Faculty of Chemistry, Gliwice

WIERZBIŃSKA M.

Rzeszów University of Technology, Department of Materials Science, Rzeszów

MISZTAL A.

GONET M.

LACH G.

NIEUŻYŁA Ł.

KOSZOREK A.

Silesian University of Technology, Faculty of Chemistry, Gliwice

NOWAK P.

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

 This paper presents the results of the investigations on the preparation of the oxide coatings on magnesium alloy AZ91D with the application of the plasma electrolytic oxidation (PEO) method, in the sodium silicate solution. Coatings were characterized by investigating their morphology, chemical composition, thickness and roughness, as well as the corrosion resistivity of the surface modified alloy. The positive influence of the presence of fluoride in the oxide layer on the corrosion resistance of the alloy samples was demonstrated.

Keywords: magnesium casting alloys, plasma electrolytic oxidation, PEO, coating thickness

 2017

Vol. 60, nr 5

s. 131-135

Ref. 15

 


 

DOI: 10.15199/40.2017.5.2

Protective-conducting spinel coatings applied in IT-SOFC interconnects

BRYLEWSKI T.

BOBRUK M.

GIL A.

AGH University of Science and Technology, Faculty of Materials Science and Ceramics

The aim of the presented study was to deposit a protective-conducting Mn1.45Co1.45Dy0.1O4 coating on the E-Brite ferritic steel by means of electrophoresis and to evaluate its physicochemical properties. The structure and morphology of the powder, sinter, and the steel/coating layered system, and the electrical conductivity of both the sinter and the coating on the steel after oxidation were investigated by means of X-ray diffraction (XRD), scanning electron microscopy combined with energydispersive spectroscopy (SEM-EDS), and the two-probe dc method. The obtained spinel exhibited a two-phase composition and high electrical conductivity, while the coating it formed was compact and adhered well to the metallic substrate; moreover, the measured ASR of the steel/ coating system was significantly lower than the level acceptable for interconnect materials. The conducted research confirmed the suitability of the Mn1.45Co1.45Dy0.1O4 spinel as a coating on the E-Brite ferritic steel to be applied in the production of interconnects used in intermediatetemperature SOFCs.

Keywords: solid oxide fuel cell, interconnect, ferritic stainless steel, spinel coating

2017

Vol. 60, nr 5

s. 136-140

Ref. 25

 


 

DOI: 10.15199/40.2017.5.3

Why organophosphates can be effective multifunctional corrosion inhibitors for carbon steel in neutral water environments?

KLAKOČAR-CIEPACZ M.

KOBIAŁKA B.

KĘDZIOR R.

Technology and Chemical Processes Department, Faculty of Chemistry, Wrocław University of Science and Technology

The work presents the results of a study of selected electrochemical and anti-scaling organophosphate compounds which may constitute a basis for the development of multifunctional corrosion inhibitors of stainless steel in neutral water environments.

Keywords: organophosphate compounds, organic corrosion inhibitors, steel

2017

Vol. 60, nr 5

s. 141-145

Ref. 18

 


 

DOI: 10.15199/40.2017.5.4

Protective properties of ZrO2 coatings on steel 316L in simulated body fluid

MAZUR A.

CHĘCMANOWSKI J.

SZCZYGIEŁ B.

Faculty of Chemistry, Department of Advanced Material Technologies, Wroclaw University of Science and Technology

ZrO2 coatings were sol-gel deposited on a base made of stainless steel 316L. The sol used for this purpose contained zirconium(IV) ethoxide (ZrEt) as the precursor and butanol as the solvent. The obtained samples were exposed to simulated body fluid (SBF) for 120 days. Potentiodynamic tests showed that the deposition of five-layer ZrO2 coatings results in a twofold increase in the corrosion resistance of the steel during long-term exposure to SBF. The results of SEM and EDS analyses demonstrated that apatite ceramic accretes on the surface of the thin ZrO2 layers.

Keywords: sol-gel method, ZrO2 coatings, corrosion resistance, apatite ceramics

2017

Vol. 60, nr 5

s. 146-151

Ref. 28

 


 

DOI: 10.15199/40.2017.5.5

Physical properties of concrete with calcareous aggregate exposed to chloride solution at ambient temperature

DĘBSKA D.

Cracow University of Technology, Institute of Building Materials and Structures,

Chair of Building Materials Technology and Structure Protection

It is well known, that concrete can be prone to the chloride ingress. The processes of chloride destruction of concrete made with non reactive gravel aggregate are the subject of many labours. The main topics of these investigations are: the concrete rebar corrosion induced by chlorides, the safe content of chloride ions in various environmental conditions, the impact of freezing-thawing processes in presence of chlorides, and finally the way of chloride ions ingress and effect of chemical interaction between Cl– ions and cement matrix. In case of carbonate aggregates, researchers are mainly concentrated on reaction in type of AAR. The results of an investigation of the impact of liquid environment containing chloride ions on the susceptibility of concrete made with calcareous aggregate to changes in the physical properties such as dimension, flexural and compressive strength as well as visible modification of samples surfaces are presented in the paper. These investigations are a continuation of author’s interest on durability of concrete made with carbonate aggregate in various environmental conditions.

Keywords: physical properties, concrete, calcareous aggregates, chloride environment, ambient temperature.

2017

Vol. 60, nr 5

s. 152-156

Ref. 28

 


 

DOI: 10.15199/40.2017.5.6

Concrete decalcification as a threat of destruction of selected nuclear power plants objects

SŁOMKA-SŁUPIK B.

Faculty of Civil Engineering, Silesian University of Technology

BURY T.

Faculty of Energy and Environmental Engineering, Silesian University of Technology

The attention on the risk of destruction of concrete objects in nuclear power plants due to decalcification of hardened cement paste phases. Study on decalcification process in water solution of chloride ions was conducted under laboratory conditions.

Keywords: concrete, decalcification, SEM, XRD, Vickers, chlorides, nuclear power plant

2017

Vol. 60, nr 5

s. 157-161

Ref. 25

 


 

DOI: 10.15199/40.2017.5.7

Influence of SiC coatings on scaling-resistant properties of valve steels

GAWEŁ R.

KYZIOŁ K.

MARCIN ŚRODA M.

GRZESIK Z.

AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Krakow, Poland

JURASZ Z.

BOSMAL Automotive Research and Development Institute Ltd, Bielsko-Biała, Poland

In this work, the results of oxidation kinetics studies performed at 1173 K are presented for three types of valve steels (X33CrNiMn23-8, X50CrMn- NiNbN21-9 and X53CrMnNiN20-8) covered by a thin SiC coating with 2 micrometer thickness. The coatings were obtained via chemical vapour deposition with the help of plasma generated using electromagnetic waves with radio frequency (RF CVD, 13.56 MHz). It was determined that steels with SiC coatings exhibit greater resistance against oxidation than steels without surface modification. This is due to the formation of scales not containing iron oxides (Fe3O4 and Fe2O3) with low protective properties on the surfaces of the materials covered by SiC.

Keywords: valve steels, SiC coating, oxidation, isothermal conditions

2017

Vol. 60, nr 5

s. 162-165

Ref. 20

 


 

DOI: 10.15199/40.2017.5.8

Galvanized coatings in connecting difficult-to-bond materials.

Pt. 1. Influence of surface preparation on the adhesion of galvanised coatings to a non-metal substrate

MIRSKI Z.

CIEPACZ I.

ZIMNIAK Z.

GRANAT K.

WO JDAT T.

Politechnika Wrocławska

Issues concerning the preparation of a graphite composite surface before deposition of a galvanised copper coating and its influence on soft soldering with PA38 (6060) aluminium are presented in the article. Graphite composite samples, the surfaces of which were prepared using different methods, were galvanically coated with a copper layer and then soldered to PA38 aluminium alloy elements. Results of strength tests and metallographic tests carried out using a light microscope are presented.

Keywords: graphite composite, surface activation, galvanised copper coating, soft soldering, PA38 (6060) aluminium alloy

2017

Vol. 60, nr 5

s. 166-169

Ref. 8

 


 

DOI: 10.15199/40.2017.5.9

New heat-resistant coatings SiCO obtained on the basis of polymer-derived ceramics

NYCZYK-MALINOWSKA A.

AGH University of Science and Technology, Faculty of Materials Science and Ceramics,

Department of Silicates and Macromolecular Compounds

SMOŁA G.

GRZESIK Z.

AGH University of Science and Technology, Faculty of Materials Science and Ceramics,

Department of Physical Chemistry and Modelling

High temperature oxidation studies were initially performed on austenitic steel 1H18N9 covered by a SiCO coating obtained as the result of pyrolysis carried out on the polymer precursor ceramic V3. The results of isothermal and cyclic oxidation tests carried out at 900oC indicated that the studied coating exhibits significant resistance against the effects of a high temperature in the presence of an oxidizing atmosphere.

Keywords: polymer-derived ceramics, pyrolysis, high temperature oxidation, austenitic steel, heat-resistant scale

2017

Vol. 60, nr 5

s. 170-174

Ref. 19

 


 

DOI: 10.15199/40.2017.5.10

Effects of chloride extraction from concrete – electrochemical method for concrete repair – state of the knowledge

SZWEDA Z.

Faculty of Civil Engineering, Silesian University of Technology

This paper presents the current state of knowledge on the application of electrochemical repair method for reinforced concrete structures – electrochemical chloride extraction (ECE) technique. It has been successfully applied since the 1980s in such countries as Norway, Great Britain, the USA, and Japan. In Poland, this technique is not used. Advantages of that method are pointed in the paper as well as some drawbacks which still have not been overcome.

Keywords: chloride extraction, durability of reinforced concrete structures, electrochemical repair of reinforced concrete structures

2017

Vol. 60, nr 5

s. 175-180

Ref. 6