The evaluation of corrosion resistance of protective and functional coatings using corrosion-ratemeter

Semenychev V.V., Smirnova T.B.
UDC
669:620.199
DOI
10.18577/2307-6046-2016-0-6-12-12
Article PDF (Russian) (529.13 KB)
How to cite
Semenychev V.V., Smirnova T.B. The evaluation of corrosion resistance of protective and functional coatings using corrosion-ratemeter // Proceedings of VIAM. 2016. No. 6. DOI: 10.18577/2307-6046-2016-0-6-12-12. URL: https://test.viam.ru/en/journal/2016/6/12
Keywords
corrosion rate, polarization resistance, protective and functional coatings, depth of pits, nano particles.
Abstract

Using device R5035 the corrosion rate, expressed as current units (A/sm2), of different protective and functional coatings, deposited on steel 12H18N9T was assessed. Samples with galvanic nickel, nickel-cobalt, tin and zinc coatings were investigated. Measurements of polarization resistance were carried out in a 3% aqueous solution of NaCl with the addition of 1 ml of HCl per 100 ml of solution. Polarization resistance of pairs of samples with similar coatings was defined for forward and reverse polarization current, amounting to 800 Ω for nickel, 700 Ω for nickel-cobalt, 96 Ω for tin, 6 Ω for zinc and550 Ω for steel without coating. From the values of polarization resistance the corrosion rate of coatings in the current units was calculated and the comparison of obtained values with the sample mass loss per surface unit was given. Using «Olympus» microscope the depth of the pits formed on the surface of coatings was assessed. Work is executed within implementation of the comp

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