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Corrosion mechanisms of 316L stainless steel in polyphosphoric acid at elevated temperature: Behavior and mechanistic insights

Corrosion Science, ISSN: 0010-938X, Vol: 236, Page: 112277
2024
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The performance of 316 L stainless steel in polyphosphoric acid (PPA) at high temperature, remains a subject of considerable interest. Through weight-loss tests, electrochemical analyses, SEM, XRD, XPS, and ICP, the corrosion process of 316 L in PPA and the formation of corrosion products are systematically examined. The results elucidate a multi-step corrosion mechanism involving selective dissolution of sulfur and chromium, succeeded by the involvement of additional metallic elements, notably iron, in the construction of the corrosion product layers. This study contributes to a deeper understanding of 316 L stainless steel corrosion in PPA environments, offering insights crucial for corrosion mitigation and material design.

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