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Stainless steel naturally forms a thin, protective chromium oxide layer on its surface when exposed to oxygen. This layer helps prevent corrosion by blocking oxygen and moisture from reaching the steel underneath.

In the presence of chlorides (like salt), this protective layer can break down, leading to localized corrosion (such as pitting or crevice corrosion). The breakdown often occurs at weak points in the oxide layer.

Molybdenum helps the passive oxide layer repair itself more effectively when exposed to chlorides. By doing this, it enhances the steel’s resistance to pitting and crevice corrosion, which are common in salty or chloride-rich environments.
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