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Influence of nickel additions on the corrosion behaviour of low nitrogen 22% Cr series duplex stainless steels

The work describes the corrosion behaviour of a series of duplex stainless steels with various Ni contents in different reducing acid and NaCl solutions. The corrosion behaviour exhibited by the alloys was attributed to the influence of Ni on phase modification, microstructural refinement and the types of films formed in different environments. Uniform corrosion behaviour was predominantly controlled by phase composition and ratio, while pitting resistance depended primarily on an alloy’s Ni contents. The findings were significant, as the prevailing opinion was that only the type of phase and its ratio determined pitting corrosion behaviour.