Results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for localized corrosion. The alloys examined include 317 L, 20-type alloys, duplex stainless steels, and nickel-base alloys. The solutions utilized are acid chloride-type with and without ferric ions [Fe2(SO4)3] as an oxidizing species. The acids examined include sulfuric, hydrochloric, and mixtures of these two acids. The best accelerated test for rating localized corrosion resistance of alloys is the immersion pitting temperature test. Results from this test procedure best simulate and correlate with the service performance of alloys.

Subject
Corrosion resistant alloys, Pitting temperature, Stainless alloys, Molybdenum alloys, Crevices, Crevice corrosion, Pitting, Immersion, Corrosion resistance, Localized corrosion, Aluminum alloys, Alloys, Electrochemical potential
National Association of Corrosion Engineers
1983
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