Stainless steel is widely used in industries such as construction, food processing, chemical engineering, and medical devices due to its excellent corrosion resistance and aesthetic appeal. However, different grades (e.g., 304, 316) exhibit significant variations in corrosion resistance.
The corrosion resistance of stainless steel primarily depends on the passive oxide layer (Cr₂O₃) that forms on its surface. Key alloying elements influence this layer's stability:
Chromium (Cr): ≥10.5% is required for passive film formation, enhancing oxidation and acid resistance.
Nickel (Ni): Improves ductility and resistance to reducing environments (e.g., dilute sulfuric acid).
Molybdenum (Mo): Significantly enhances resistance to chloride-induced corrosion (e.g., seawater, salt spray).
Sulfuric & Hydrochloric Acid: Both grades struggle with strong reducing acids, but 316 performs slightly better in dilute sulfuric acid.
Phosphoric & Acetic Acid: Both 304 and 316 perform well, but 316 is preferred in contaminated industrial environments.
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