Stress Corrosion is type of corrosion which occurs due to the combined action of Tensile Stress and corrosive environment. Stresses may be Residual or Applied.
Corrosive environment act at existing crack crevices. Tensile stresses pull the metal apart at the crevices & exposes new metal to corrosive environment…….. This way attacked crack surfaces will propagate & will result in brittle failure of the metal.
Residual Stresses ------------> Due to cold working of Metal
Applied stresses -------------> Applied Internal Pressure
Corrosive Environment -----> Chloride, H2S in water
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