Electrochemical properties and chemical passivity of etch-resistant surface films on steel

I. V. Karpenko, E. M. Gutman, A. K. Mindyuk

Research output: Contribution to journalArticlepeer-review

Abstract

1. All the types of etch-resistant surface films studied are electropositive with respect to the underlying metal. The most electropositive potential was recorded for films of maximum thickness. 2. Adjacent steel surfaces with and without etch-resistant films form galvanic macro- and microcells in which the etch-resistant films act as cathodes. 3. The etch-resistant films can, under specified conditions, considerably reduce the corrosion rate of steel in acid media. For example, a 20% reduction in the corrosion rate for 40Kh steel specimens with type II surface films was recorded in tests in a 53% H2SO4 solution. 4. A tentative explanation (based on the results of X-ray diffraction and metallographic analyses) of the electrochemical and corrosion properties of etch-resistant films is offered. 5. An analogy is suggested between the action of etch-resistant surface films and porous cathodic coatings.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalSoviet Materials Science
Volume1
Issue number2
DOIs
StatePublished - 1 Mar 1966
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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