There will be rust spots on the steel elbow of the stainless steel pipe, indicating that the steel elbow is not made of pure stainless steel, but is a stainless steel elbow of electroplating type. The rust spots can be polished with ultra-fine sandpaper and then sprayed with colorless varnish for anti-rust treatment ready to use. If the rust spots are not treated, these rust spots will gradually expand, affecting the appearance and shortening the service life of the steel elbow.
When brown rust spots (spots) appear on the surface of stainless steel elbows, people are surprised: "Stainless steel does not rust, and if it rusts, it is not stainless steel, and there may be a problem with the steel." This is a one-sided wrong view of lack of understanding of stainless steel, stainless steel will rust under certain conditions.
When the stainless steel is rusted, the surface of the product can be cleaned with a rust remover to remove the rust and then passivated and rust-proofed to prevent the surface from re-oxidizing.