What is acquired rust? Causes and prevention methods for rusting stainless steel.
Acquired rust refers to the phenomenon where metal in contact with stainless steel rusts, causing the stainless steel itself to rust as well.
"The Causes of Stainless Steel Rusting" Stainless steel has the characteristic of being resistant to rust, but it is not completely rust-proof! There are four main causes of rusting in stainless steel. 1. Contaminated Rust This phenomenon occurs when stainless steel comes into contact with other types of metals, causing the passive film to break down and resulting in rust on the stainless steel. Stainless steel that has been scratched by other metals may gradually rust from the damaged areas. 2. Salt and Acidity The passive film that protects stainless steel from rust is vulnerable to salt and acids. In regions such as coastal areas, where it may come into contact with acidic chemicals, stainless steel can rust. 3. Dirt and Moisture Areas that are contaminated with dirt or water can have their passive film destroyed, leading to rust. 4. Welding and Bending Processes Welded or bent areas may retain residual stress from the processing. If this residual stress remains, it can lead to deterioration of the crystal structure, resulting in rust formation.
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