Studies showed that the immunity to stress corrosion cracking (SCC) conferred by some alloying variations in the standard boiling 45% MgCl2 test and other standard tests is only a conditional immunity produced by film destabilization and by delocalization of corrosion favoring blunt pitting over cracking. In such cases, immunity can be nullified simply by altering environmental conditions to promote relocalization of corrosion. Cl- concentration, Cl- cation type, and additives that influence corrosion kinetics all influence SCC susceptibility through their effects on overall film stability and localization of corrosion. The influence of alloying and environmental factors on protective film stability was found to be associated with their influence on oxide film Cr, Fe, Si, and Ni contents. Crack morphologies produced under conditions of varying film stability were suggestive of a cracking mechanism involving propagation by strain assisted localized corrosion.
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Lawrence Bednar (1977) studied this question.
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