Patent ID: 7458358
Filing Date: 2008-12-02
Classification: B23K,C23C,F02B,F02F,F16J,Y02T,Y10T

Abstract:
1. A method for improving the corrosion resistance of a piston crown for an internal combustion engine, said method comprising the steps of: providing a piston having a crown presenting an exterior crown surface; preparing a coating material consisting essentially of a corrosion-resistant and oxidation-resistant composition; applying the coating material to the piston crown such that the coating material adheres to the crown surface having an as-applied microstructure and an as-applied porosity less than 100% full material density; irradiating the coating with a high energy laser beam to increase the density of the coating while simultaneously reforming the microstructure and creating a material bond between the coating and the crown surface; and masking a portion of the coating to prevent irradiation from the laser beam.