Original scientific paper

Trends in the Electrochemical Polarization Potentiodynamic Reactivation Method – EPR

V. Cihal
S. Lasek
M. Blahetova
E. Kalabisova
Z. Krhutova

Abstract

This method designed to examine the susceptibility to nonuniform corrosion, ranks among the more successful technique developments. One of its numerous advantages is that it allows nondestructive, on-site examination. EPR measurements are used to establish
the resistance of stainless steels and alloys to intergranular corrosion and stress corrosion cracking e.g. in nuclear engineering applications as well as to study grain boundary precipitation and other minute local changes in alloy composition and structure. By the EPR test, the specimen and/or the field object (working electrode) is tested
in acid solutions, most often in solutions of sulfuric acid (c = 0.01–5 mol dm–3 H2SO4) and potassium thiocyanate (c = 0.001 to 0.1 mol dm–3 KSCN). The principle of the measurements is to reactivate the sample from the incomplete passivity region. This indicates local changes in chemical composition in relation to phase transformations.

Keywords

Nonuniform corrosion; intergranular corrosion; stress corrosion; EPR method

Hrčak ID:

10564

URI

https://hrcak.srce.hr/10564

Publication date:

29.3.2007.

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