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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Corrosion reactions: a reminder
Behavior of the main refractory metals and alloys
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