Year: 2025
Type: article
Abstract: In sulfate-or chloride-ion environments, the current density in the active/passive transition region in Fe-11 mass％ Cr steels decreases with the addition of 2 mass％ Al or Si.This reduced current density lowers the passivation pH; consequently, the corrosion resistance of the Al/Si-added Fe-11 mass％ Cr steel is superior to that of the Fe-11 mass％ Cr steel.The Al (or Si) content in the passive film formed on Fe-11 mass％ Cr-2 mass％ Al (or -2 mass％ Si) , is higher than that in the substrate.The excellent corrosion resistance of the Al-added low-Cr stainless steel is attributed to the generation of Al (III) hydroxides, which dominates over that of Fe (II) and Cr (III) .By contrast, the excellent corrosion resistance of the Si-added low-Cr stainless steel is ascribed to the formation of Si oxides.
Source: Corrosion engineering digest
DOI: 10.3323/jcorr.74.155
Authors: Masatoshi Abe, Akinori Kawano, Toru Matsuhashi, Nobuhiko Hiraide, Jun-ichi Hamada, Akira Nagaoka, Eri Hoshiba, Akihiro Fujimura, Koji Fushimi
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7083199450
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