Passivity breakdown, pit initiation and propagation of pits in metallic materials – Review

Corrosion behavior of an equiatomic CoCrFeMnNi high-entropy alloy compared with 304 stainless steel in sulfuric acid solution

Pitting corrosion behaviour of austenitic stainless steels – combining effects of Mn and Mo additions

High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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G.O Ilevbare

Papers

The role of alloyed molybdenum in the inhibition of pitting corrosion in stainless steels

The inhibition of pitting corrosion of stainless steels by chromate and molybdate ions

The effect of specimen size on the measured pitting potential of stainless steel