Why Does Stainless Steel Rust?

First of all, stainless steel screws have strong corrosion resistance, high temperature resistance, and good anti-rust performance. However, they are not completely immune to external environmental erosion, and they will still rust in some harsh environments.

1. The surface of stainless steel has dust or foreign metal particles of other metal elements. In humid air, the condensed water between the attachments and the stainless steel connects the two into a micro-battery, triggering an electrochemical reaction, destroying the protective film, and generating electrochemical corrosion.

2. Organic juice (such as vegetables, noodle soup, sputum, etc.) adheres to the surface of stainless steel. In the presence of water and oxygen, organic acid is formed. The organic acid corrodes the metal surface for a long time.

3. Acid, alkali, and salt substances (such as alkaline water and lime water splashing from wall decoration) adhere to the surface of stainless steel, causing local corrosion.

4. In polluted air (such as atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), condensed water forms sulfuric acid, nitric acid, and acetic acid liquid points, causing chemical corrosion.

5. In coastal areas, due to proximity to the sea, the air contains a lot of salt, which can corrode stainless steel, etc.

6. Due to poor on-site storage, contamination by rust-prone objects or welding slag on the surface, fasteners can also rust.