Evaluation of porosity of chromecarbide coatings on different classes of structural materials using measurement of systems stationary potential

Semenychev V.V., Smirnova T.B.
UDC
620.1:629.7.023
DOI
10.18577/2307-6046-2016-0-4-7-7
Article PDF (Russian) (442.3 KB)
How to cite
Semenychev V.V., Smirnova T.B. Evaluation of porosity of chromecarbide coatings on different classes of structural materials using measurement of systems stationary potential // Proceedings of VIAM. 2016. No. 4. DOI: 10.18577/2307-6046-2016-0-4-7-7. URL: https://test.viam.ru/en/journal/2016/4/7
Abstract

Stationary potentials of pyrolytic chromecarbide coating (PCCC), deposited on samples of various structural materials, like steel 30HGSA, titanium alloy VT6 and aluminum alloy D16ch.-T have been measured in 3% aqueous NaCl solution. Thickness of chromecarbide coatings ranged from 6 to 30 μm. In order to eliminate the influence of substrate on formation of stationary potential the PCCC was deposited on glass samples. The potential steady-stated in 72 hours was taken as stationary. Additionally to coated samples the initial samples of selected structural alloys were studied. Research has shown that PCCC is a cathode coating and the value of its stationary potential is +285 mV. Stationary potentials of the used structural materials have negative values, which range from -110 to -730 mV. Analysis of experimental data showed that the decrease in thickness of coating leads to a shift of the value of stationary potential to negative range, i. e. at small coating thicknesses substrate through

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