Abstract
The improved lifetime of platinum-modified aluminide coatings under conditions of high temperature, hot corrosion and cyclic oxidation has been attributed in large part to the excellent oxide adherence exhibited by these systems. Although these benefits have been well documented, the reasons for the increased adherence requires additional investigation. In this study the effects of pre-aluminizing surface smoothness and coating structure for both platinum-modified and unmodified aluminide coatings on IN-738 were examined in a cyclic oxidation environment at 1100 °C. Weight change measurements were used to determine the coating scale adherence characteristics and to quantify the cyclic oxidation behavior effect of the various coating structures.
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