
Pickling & passivation are the most widely used surface treatment method for stainless steel castings. Stainless steel casting can corrode in service if there is contamination of the surface. Both pickling and passivation are chemical treatments applied to the surface of stainless steel casting to remove contaminants and assist the formation of a continuous chromium-oxide, passive film. Pickling and passivation are both acid treatments and neither will remove grease or oil. As black or yellow scale cinder are easily produced…