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the claim

Chromium protects stainless steel from rusting by forming a passive oxide layer

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Multiple studies substantiate that chromium protects stainless steel from corrosion by forming a stable, protective chromium oxide (Cr2O3) passive film on its surface.

The analysis

The retrieved literature consistently supports the foundational metallurgical principle that the corrosion resistance of stainless steel is due to a passive chromium oxide surface layer. All relevant studies referencing the mechanism affirm this conclusion, yielding a SUPPORTED balance verdict.

Evidence for · 6
Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel
Recorded source metadata

A. Costa, Mara Cristina Lopes Oliveira, R. A. Antunes. Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel. 2020. https://doi.org/10.1002/sia.6927

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
Recorded source metadata

Jianfang Bai, Haijun Li, Guodong Wang. Review on Evolution of Oxide Layer and Chromium Depletion Layer of Austenitic Stainless Steel during Industrial Processing. 2025. https://doi.org/10.1002/srin.202400938

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
Recorded source metadata

M. Revon, N. Priyantha. Interference of solution constituents on corrosion inhibition of phosphate species on Grade 202 stainless steel. 2025. https://doi.org/10.1007/s44371-025-00157-4

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.
Recorded source metadata

Zhang X, Liu Y, Chen G, Bai S, Li Z, Wang F, Xu D. Long-term continuous corrosion of 316L stainless steel by <i>Streptococcus mutans</i> in simulated oral environment.. 2025. https://doi.org/10.3389/fbioe.2025.1725414

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
Recorded source metadata

C. Gaona-Tiburcio, Miguel Villegas-Tovar, E. Maldonado-Bandala, M. Lara-Banda, M. Baltazar-Zamora, Ce Tochtli Méndez-Ramírez, D. Nieves-Mendoza, Verónica Almaguer-Cantu, J. Jáquez-Muñoz, A. Landa-Gómez, F. Almeraya-Calderón. Investigation into the Effects of Citric Acid on the Corrosion Behavior of AM 350 Stainless Steel Using Electrochemical Impedance Spectroscopy. 2025. https://doi.org/10.3390/met15040420

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.
Recorded source metadata

Jin Y, Cheng Q, Xu D, Lovley DR. Electroactive Microbes Short-Circuit the Passive Film to Corrode Stainless Steel.. 2026. https://doi.org/10.34133/research.1185

Paper [9] discusses how the protective chromium oxide passive film protects underlying metal from corrosive agents.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8301 Aug 2026
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