Stainless steel Corrosion resistance

Damage of passivation film:

The thickness of the passivation film on the surface of stainless steel is very small, only 1-3nm. Passivation treated stainless steel can easily damage the passivation film during storage, transportation, and use, affecting its corrosion resistance.

The main reasons for the damage of the passivation film are:

1. Collision, squeezing, and scratching of the passivation film on the surface of stainless steel.

2. Various liquids, solvents, greases, or protective materials may cause localized damage to the passivation film on the surface of stainless steel.

3. Dust deposition on stainless steel surfaces containing Zn, Pb, Cu, Al, Fe, brass, bronze, galvanized products, and zinc paint damages the uniformity of the passivation film.

4. Local or overall oxidation stain caused by welding, hot forming, heat treatment and other Hot working. The thickness and composition of these color spots generated under different temperature conditions are detrimental to the corrosion resistance of stainless steel.