Stainless steel is a metal alloy composed mainly of iron, chromium, nickel, and other elements. Among them, the key to its corrosion resistance lies in chromium. Chromium forms an extremely thin and strong chromium-rich oxide film on the surface of the stainless steel, which can prevent oxygen and water from further invading the interior of the stainless steel, thus playing a protective role.

Stainless steel valve rust causes：

1.Ph impact: Both strong acids and bases can destroy the surface oxide film and cause corrosion.

2.High-temperature environmental: At high temperature, the internal structure of stainless steel may change,which reduce the ability of chromium elements to form protective films, and accelerate the rate of corrosion.

3. Material factors stainless steel type difference: Not all stainless steels are created equal. Using improper selection can lead to rust, such as the use of martensitic stainless steel valves in chlorine-containing environments, resulting in rapid rust. Impurities: Impurities in stainless steel such as sulfur, phosphorus, which can lead to accelerate corrosion.

4. Surface damage: The surface oxide film can be damaged during processing, such as cutting, welding, or polishing. High temperatures from welding can destroy this film. If the valve is not properly pickled and passivated after welding, it can become susceptible to rust. Similarly, impacts or scratches during use can damage the oxide film, leading to rust.

5.Stress concentration: Stress concentration during installation or use can also affect the corrosion resistance of the valve.
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