Patent ID: 6875292
Filing Date: 2005-04-05
Classification: C23C,C23F,F01D

Abstract:
1. A process for rejuvenating a platinum-containing diffusion aluminide coating on a component following deposition of the diffusion aluminide coating and before placing the component in service at an elevated temperature, the diffusion aluminide coating comprising an additive layer on a surface of the component and a diffusion zone below the additive layer and in a surface region of the component, the process comprising the steps of: treating the diffusion aluminide coating to an aqueous solution consisting essentially of nitric acid and phosphoric acid at a temperature of about 70° C. to about 80° C. until at least part of the additive layer has been removed but the diffusion zone remains, thereby establishing a treated surface of the diffusion aluminide coating; depositing a platinum layer on the treated surface; heat treating the component to diffuse the platinum layer into the treated surface; and then aluminizing the treated surface of the component.