Metallic materials used in certain areas of the chemical process industry face high temperature attack in the form of oxidation, sulfidation, carburization, halogen attack, etc. One approach to defending metallic materials against high temperature corrosive attack is through the use of protective coatings. Although several coating methods are available, halide-activated pack cementation is a coating process of choice due to its versatility and cost-effectiveness. Traditionally pack cementation has been utilized to apply aluminum, chromium or silicon-rich coatings. The coating process is reviewed and a model to predict the kinetics is outlined. The effective utilization of this process to achieve desired results is discussed.

Subject
Coatings, Materials, Thermodynamics, Substrates, Aluminum, Gas pressure, Partial pressures, Substrate surfaces, Constants, Kinetics, Deposition rate, Cementation, High temperature
Keywords:
coatings, pack cementation, halide-activated, aluminizing, chromizing, siliconizing
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2009
Association for Materials Protection and Performance (AMPP)
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