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„Ochrona przed Korozją” (Corrosion Protection) No. 01/2016

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

 

DOI: 10.15199/40.2016.1.1

Characteristic of cyclic oxidation of chosen austenitic steels in a steam atmosphere

KOŚCIELNIAK B.

Silesian University of Technology, Department of Material Science and Metallurgy,

Katowice, Poland

SMOŁA G.

GRZESIK Z.

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

Department of Physical Chemistry and Modeling, Kraków, Poland

The aim of the study was to evaluate the oxidation resistance of chromium-nickel austenitic steels in an atmosphere, which contains oxygen and steam at a temperature of 750oC. The oxidation test of steel samples X2CrNiMo17-12-2, X6CrNiMoTi17-12-2, Super 304H and HR3C was carried out in a cyclic mode, made up of 100 cycles trials of 2 hours. The results show the mass changes of steels caused by a cyclic oxidation. The morphology and chemical composition of the oxide layer formed on the surface of tested samples were also described. It has been proved that under these conditions HR3C steel shows the best heat resistance and X2CrNiMo17-12-2 steel presents the worst tendency of oxides to defoliation.

Keywords: austenitic steels, cyclic oxidation, steam

2016

Vol. 59, nr 1

s. 2-5

Ref. 9


DOI: 10.15199/40.2016.1.2

The influence of unconventional ion nitriding corrosion resistance of steel 316L

PILARSKA M.

OLEJNIK M.

RYSZKO K.

FRĄCZEK T.

Politechnika Częstochowska, Wydział Inżynierii Produkcji i Technologii Materiałów,

Instytut Inżynierii Materiałowej, al. Armii Krajowej 19, 42-200 Częstochowa

Preliminary results of the properties of the surface layers obtained on the 316L austenitic stainless steel, as a result of ion nitriding for two variants deployment of samples in the working chamber. The study of surface hardness and surface layers potentiodynamic study allowed us to evaluate the effectiveness of process variants.

Keywords: ion nitriding, active screen, austenitic steel

2016

Vol. 59, nr 1

s. 6-8

Ref. 11


 

DOI: 10.15199/40.2016.1.3

Methodology for assessing chemical resistance of cement concreto for sewer elements

WOYCIECHOWSKI P.

SOKOŁOWSKA J.J.

JAWORSKA B.

Department of Building Materials Technology, Faculty of Civil Engineering,

Warsaw University of Technology

The current state of Polish and European standardization does not include chemical resistance test procedurę for concrete for sewer elements. The elaboration of such a procedure requires the analysis of a number of exploitation aspects as well as aspects related to the methodology of research. This paper presents the comprehensive approach to the number of issues that need to be considered, the extracts from standards and other codified methods of testing chemical resistance of sewer elements made of composites based on cement and other binders and characterization of testing (aggressive) environments. Performed analysis allowed to formulate the outline procedure and potential criteria for evaluation of chemical resistance (including acid resistance) of concrete for sewer elements.

Keywords: concrete chemical resistance, concrete acid resistance, testing methodology, concrete sewer elements

2016

Vol. 59, nr 1

s. 10-17

Ref. 12


DOI: 10.15199/40.2016.1.4

Changing of resistance of RC beam in bending due to reinforcement corrosion

KOTEŠ P.

Department of Structures and Bridges, Civil Engineering Faculty,

University of Žilina, Slovakia

The quality and the durability of the concrete structures are affected by lots of degradation processes. The degradation processes influence mainly concrete and reinforcement and cause chemical, physical and mechanical changes in materials. The paper deals with reinforcement corrosion and its influence on the reliability of the existing bridge concrete structures. One type of passive stage calculation and one type of active stage calculation are considered in this paper. The probabilistic approach is used for the time dependent resistance solution.

Keywords: bridge, reliability, existing structure, load-carrying capacity, bending, concrete, reinforcement, corrosion, mean value, standard deviation

2016

Vol. 59, nr 1

s. 18-21

Ref. 17


DOI: 10.15199/40.2016.1.5

Inhibition of carbon steel corrosion by polyampholyte mixture in a model pore water solution with chloride ions

Klakočar-Ciepacz M.

Klem M.

Muratow P.

Faculty of Chemistry, Wrocław University of Technology

The paper presents the results of research on polyampholyte resin, in light of its potential application as a corrosion inhibitor for carbon steel, in environments simulating concrete pore liquid contaminated with chloride ions. As a result of the electrochemicalstudies conducted, the instantaneous corrosion rate for steel as well as the optimum dose of the test compound used as a carbon steel corrosion inhibitor in the test solutions were determined. On the basis of the spectra obtained in tests using an electron microscope, the changes on the surface of the samples were analysed.

Keywords: corrosion inhibitors, reinforcement, microscopy, spectroscopy

2016

Vol. 59, nr 1

s. 22-26

Ref. 6


CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2016.1.6

Aluminium as structural material for drip cap sections

ZUBIELEWICZ M.

Instytut Inżynierii Materiałów Polimerowych i Barwników, Oddział Farb i Tworzyw, Gliwice

GAWRON M.

RENOPLAST, Żywiec

Drip cap section made both of galvanized steel and aluminium sheets are susceptible to corrosion in contact with humid alkaline building materials, like mortar or concrete. Corrosion damages of drip caps made of galvanized steel coated by coil coating and corrosion of aluminium in alkaline media are discussed. Examples of effective protection systems for aluminium sheets mounted in mineral mortars are also given.

Keywords: drip caps, corrosion, aluminium, protective coatings

2016

Vol. 59, nr 1

s. 27-29

Ref. 12