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Influence mechanism of heat treatment on corrosion resistance of Te-containing 15–5PH stainless steel.
- Source :
-
Corrosion Science . Dec2023, Vol. 225, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- In this study, the corrosion resistance mechanism of the Te and heat treatments on martensitic stainless steel (15–5PH steel) was investigated. Heat treatment affected the dislocation density of the Te-containing 15–5PH steel and reduced its corrosion tendency. Electrochemical dissolution of the MnS-Te inclusions induced pitting corrosion. Heat treatment significantly affects the potential difference between the Te-modified inclusions and the steel matrix, consequently influencing the emergence of pitting corrosion. Heat treatment improved the anti-corrosion properties of 15–5PH steel by transforming it from an active state to a passive state. The Mott-Schottky test results show that the passive film always exhibits n-type semiconductor characteristics and that the defect density of the passive film is reduced by the heat treatment. Heat treatment facilitated the enrichment of Cr, Te, and TeO 3 in the passivation film, resulting in its improved stability and corrosion resistance. The formation of an insoluble or slowly dissolved tellurite film through Te anodic oxidation, along with the self-healing properties of TeO 3 , improved the repassivation capability of the passivation film of the steel. • Heat treatment alters the corrosion resistance mechanism of Te-containing 15–5PH stainless steel. • Heat treatment affects the dislocation density and passivation film composition of Te-containing stainless steels. • Heat treatment improved the anti-corrosion properties of 15–5PH steel by transforming it from an active state to a passive state. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0010938X
- Volume :
- 225
- Database :
- Academic Search Index
- Journal :
- Corrosion Science
- Publication Type :
- Academic Journal
- Accession number :
- 173474720
- Full Text :
- https://doi.org/10.1016/j.corsci.2023.111610