Study of Si-containing amorphous layer by electrical discharge coating

Abstract

Electrical discharge machined surface using Si electrode has excellent corrosion resistance because of the formation of an amorphous layer. In this study, Si-containing amorphous layer which was comparatively thick (about 10μm) was formed by electrical discharge coating, and the characteristics of this layer were investigated. As a result, it was revealed that the Si-containing amorphous layer had excellent erosion resistance in addition to excellent corrosion resistance. Moreover, detailed metallographic analyses showed that fine structures with crystalline existed in the Si-containing amorphous layer.