✦ LIBER ✦

A kinetical model for the electrochemical grooving of grain boundaries

✍ Scribed by L. Beaunier; M. Froment; C. Vignaud

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 617 KB
Volume: 25
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(80)87127-1

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✦ Synopsis

In the case of Fe-Ni-Cr alloys (without precipitation), we propose an electrochemical method which allows us to obtain a reproducible selective corrosion of grain boundaries (H,SO,-2N 25'C in the transpassive domain) . We establish a model of dissolution to explain the morphology of etched grooves . From this model we deduce a parameter a o which characterizes the intergranular corrosion susceptibility of a given alloy .

Electrochemical kinetic allows us to calculate the ratio of the density of active sites at the emergence of the grain boundary and on the surface of the grain . This electrochemical method permits us to study the effects of the segregation phenomena, of composition alloy and of grain boundary structure on intergranular corrosion .

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