What is it about?
We studied the resistance to crevice corrosion of 304 and 316 stainless steels, among the most widely used passive metallic materials, by the testing methods developed for the more resistant Ni-Cr-Mo alloys. Galvele's localized acidification model was very useful to gain insight into the crevice corrosion mechanism.
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Why is it important?
Austenitic stainless steels of the type 304 and 316 are among the stainless alloys most commonly used in practically every industry. Through this work we have a common basis of comparison for the crevice corrosion resistances of these stainless steels and the more corrosion resistant Ni-Cr-Mo alloys (10.1149/2.0431503jes). Galvele's model helped us to quantify the different contributions to the repassivation potential. In the light of this model, we can also compare crevice corrosion and pitting corrosion results (10.1016/S0010-938X(98)00020-1). The model can account for the effect of molybdenum as an alloying element on the crevice corrosion resistance of stainless steels.
Perspectives
The development and application of more severe and conservative testing techniques and devices for the study of crevice corrosion has led to reproducible results which can quantify the resistance of different types of materials. Comparison of results is now possible, an so we can infer not only which material would be the best choice, but also which ones are good enough and which ones are unsuitable. 304 and 316 type stainless steels are still to be used in many environments. They are currently licensed for use as the confinement boundary of dry cask storage systems canister for nuclear waste in the United States. This special number of Corrosion journal gave a the chance to pay tribute to our mentor, Prof. José R. Galvele, founder of our group and first director of Instituto Sabato (Argentina).
Dr Martín A Rodríguez
Comision Nacional de Energia Atomica
Read the Original
This page is a summary of: Comparative Study of the Crevice Corrosion Resistance of UNS S30400 and UNS S31600 Stainless Steels in the Context of Galvele's Model, CORROSION, August 2016, NACE International,
DOI: 10.5006/2179.
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