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Chemical and biochemical engineering quarterly, Vol.21 No.1 March 2007. -

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.

Nonuniform corrosion; intergranular corrosion; stress corrosion; EPR method

Autor: V. Cihal - S. Lasek - M. Blahetova - E. Kalabisova - Z. Krhutova -



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