Abstract
Corrosion problems of metals and alloys in caustic soda containing chloride and/or chlorate ions have been described in connection with the process conversion of Japanese chlor-alkali industry. Iron and carbon steels are useful in alkaline solutions even at high concentrations. Stainless steels are desirable in alkali free of chloride and chlorate, but are susceptible to localized corrosion of various forms such as pitting, crevice corrosion, and stress corrosion cracking including caustic embrittlement, when the solution contains aggressive impurities, i. e., either Cl- or ClO3-.
