The degree of interfacial attack in devitrified Metglass 2826A was determined by electrochemical potentiokinetic reactivation (EPR) testing and compared to solution-treated, stabilized, and sensitized AISI 304 stainless steel (SS). The interfacial corrosion of heat-treated AISI 304 SS increased in the order solution-treated, stabilized, and sensitized in the active-passive region of polarization in 0.5 M H2SO4 + 0.01 M KSCN. Primary crystallized (multiphase) Metglass 2826A displayed much higher interfacial corrosion than even sensitized AISI 304 SS. A refining of the distribution and type of phases present by polymorphic (supersaturated solid solution) crystallization reduced the level of attack to that observed for solution-treated AISI 304 SS.

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National Association of Corrosion Engineers
1987
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