Corrosion reactions: a reminder
High-temperature gas corrosion of refractory metals and alloys

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COR378 V1 Article

Corrosion reactions: a reminder


High-temperature gas corrosion of refractory metals and alloys

Authors : François ARMANET (†), Gérard BÉRANGER, Gérard MOULIN

Publication date: December 10, 2012 | Lire en français

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2. Corrosion reactions: a reminder

Before considering the rates of reaction of a material, particularly a metal, with its chemical environment (kinetic approach), which determines service life, we need to examine which corrosion products are likely to form under given conditions, assumed to be at equilibrium (thermodynamic approach).

2.1 Thermodynamic approach

Apart from gold, the only metal that is perfectly stable in air, common metals exist in the earth's crust only in combination with oxygen, carbon, phosphorus, sulfur or nitrogen. In nature, therefore, there are numerous metallic minerals of varying richness, including oxides, sulfides, phosphates, sulfates, carbonates, chlorides and nitrates. Metals can be found in their native state, but only under very specific conditions. Their concentrations...

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