304 stainless steel wire drawing why rust?? long rust what is the reason?
The machined stainless steel has a change in the composition and structure of the machined surface, and the corrosion resistance will be reduced and the rust will be easily rusted.
1, stainless steel is one of the reasons for the rust is the surface of 400# finish, drawing damage to the finish, so rust2, and there is the drawing equipment, may contain carbon elements, rust after contact
1. stainless steel products have to be passivation process, the surface free iron removal, rust prevention will be good. 304, only to clean the workpiece, soaked in 45% (volume ratio) nitric acid about 30-60min., that is passivation effect2. wire drawing can not contain alumina and other metal compounds, to avoid contamination of stainless steel surface, will affect corrosion resistance and passivation effect3., stainless steel cutting tools, wheels, grinding materials can not share with other metal work
