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Updated: Jun 14, 2025

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Evolution of the Corrosion Products around MnS Embedded in AISI 304 Stainless Steel in NaCl Solution
Dan Li1, Hongliang Hao1, Zhichao Wang1,2
1Ordos Research Institute of Energy, Peking University, Ordos 017010, China.
Abstract:
The characterization and evolution of corrosion products deposited on/around MnSs, a typical kind of inclusive particle embedded in AISI 304 stainless steel, was analyzed using a quasi-in-situ method in a 3.5 wt.% NaCl solution. On/around the MnS inclusion, a corrosion product layer with spinel Fe3-xCrxO4 as the main component was formed, with a thickness of several hundred nanometers. Below the layer, there was a cavity layer in which part of the MnS remained, forming secondary pitting along the MnS/matrix boundary. The mechanism of corrosion product deposition and evolution accompanied by MnS dissolution, as well as the characteristics of the corrosion products, are discussed.
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