Abstract
The principles that control the reactions occurring during the formation of metallic diffusion coatings for the protection of iron and steel are reviewed. Thermodynamic principles are used to examine the reaction mechanisms of coating formation, and are related to the composition and structure of the coatings formed. The principles of diffusion are outlined and a description of the experimental determination of diffusivities is given, together with some typical results. The mechanistic aspects are discussed with particular reference to metals. Solutions of the diffusion equations are analysed with respect to the kinetic aspects of diffusion coating formation, which are also often a function of composition and structure.
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