Chromium protects stainless steel from rusting by forming a passive oxide layer
the verdict
SUPPORTED
the evidence backs this
confidence 83/100
Multiple studies substantiate that chromium protects stainless steel from corrosion by forming a stable, protective chromium oxide (Cr2O3) passive film on its surface.
Evidence for · 6
Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel
2020 · cited by 19
Paper [2] notes that citric acid passivation enhances corrosion resistance by enriching the passive film with Cr2O3.
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More for · 5
Review on Evolution of Oxide Layer and Chromium Depletion Layer of Austenitic Stainless Steel during Industrial Processing
2025 · cited by 6
Paper [3] explains that austenitic stainless steel forms a dense Cr2O3 film which endows it with excellent corrosion resistance.
Interference of solution constituents on corrosion inhibition of phosphate species on Grade 202 stainless steel
2025 · cited by 4
Paper [4] states that the strong corrosion resistance of stainless steel is attributed to the presence of chromium, forming a passive surface film of chromium oxide.
Long-term continuous corrosion of 316L stainless steel by <i>Streptococcus mutans</i> in simulated oral environment.
2025 · cited by 1
Paper [5] links stainless steel corrosion to a reduction in the protective Cr2O3 content within the passive film.
Investigation into the Effects of Citric Acid on the Corrosion Behavior of AM 350 Stainless Steel Using Electrochemical Impedance Spectroscopy
2025 · cited by 1
Paper [6] confirms that passivation forms a compact, continuous, and adherent chromium oxide film to improve corrosion resistance.
Electroactive Microbes Short-Circuit the Passive Film to Corrode Stainless Steel.
2026 · cited by 0
Paper [9] discusses how the protective chromium oxide passive film protects underlying metal from corrosive agents.