Active Path Dissolution

Definition - What does Active Path Dissolution mean?

Active path dissolution is a material failure due to stress corrosion cracking (SCC) that is characterized by the progression of corrosion along an intermolecular path of least resistance with high concentrations of tensile strength.

Corrosionpedia explains Active Path Dissolution

Active path dissolution is characterized by the significantly increased rate of corrosion along an intergranular sub-section or boundary that presents above average susceptibility to corrosion. Such granular boundaries on the molecular level within metals tend to display segregation of impure elements, while the bulk layer of the material contains a passive tendency. This makes it more difficult for passivation and protection of the bulk material to occur.

This is the case when austenitic stainless steel is sensitized by chromium carbide along its grain boundary. The local chromium concentration at the grain boundary is depleted, causing less passivation. This results in the formation of crevice corrosion at the grain boundary.

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