Metal or alloy for oxygen in the atmosphere, water, acid, salt and moist air caused by corrosion or discoloration called rust or corrosion, it can make metal surface layer with high strength compound strength is very low.To this end, often need to investment castings mid-term anti-rust treatment.Rust prevention measures in the process of heat resistant steel castings in production, usually choose water-based anti-rust or oil rust.No matter choose which kind of way to rust, casting to advance through the wash, wipe out the dirty things on the surface of the, and promote its passivation film.Washing fluid composition, temperature and use.Heat-resistant steel castings after wash with hot, dry compressed air blow dry, then for anti-rust treatment.