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Influence of the surface state on the Initiation of Crevice Corrosion on stainless steels
Author(s) -
Sydberger T.
Publication year - 1981
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19810320303
Subject(s) - pickling , crevice corrosion , passivation , metallurgy , materials science , nitric acid , corrosion , austenite , nucleation , hydrofluoric acid , pitting corrosion , composite material , chemistry , microstructure , organic chemistry , layer (electronics)
Results from sea‐water and laboratory exposure tests with multiple crevice assemblies are presented. The results from tests on austenitic and ferritic‐austenitic stainless steel samples subjected to various surface treatments demonstrate that an acid treatment greatly improves the crevice corrosion resistance of previously ground surfaces. Pickling in dilute sulphuric acid and passivation in nitric acid has thereby virtually the same beneficial effect as the common nitric + hydrofluoric pickling acid. The beneficial effect of pickling and passivation is related to the removal from the surface of sulphide inclusions, being potential nucleation sites for the initiation of discrete pitting attacks preceding the onset of crevice corrosion. Potentiodynamically determined pitting potentials and results from testing in 10% FeCl 3 · 6 H 2 O according to ASTM G 48–76 show poor correlation with results from sea‐water exposures.