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This study investigates the effect of P addition on the corrosion resistance of steels before and after rust formation. Electrochemical measurements and surface analysis of P-containing steels (Fe-0.5 mass% P, Fe-1.0 mass% P, and Fe-1.5 mass% P) were conducted to analyze the contribution of P to their initial corrosion resistance before rust formation. The results showed that the initial corrosion resistance of the steel worsened with increasing P content. According to the surface analysis conducted by SEM/EDS, more P segregations at the grain boundaries occurred with higher P content. Polarization measurements indicated that these P segregations became initiation sites for localized corrosion, resulting in a decrease in the initial corrosion resistance.
Although the initial corrosion resistance was worse with higher P content, the long-term corrosion resistance showed the inverse trend, improving with increasing P content. Atmospheric exposure tests at Miyakojima and surface analysis of the rust layers showed that P was incorporated into the rust layer, and it promoted the protective ability against corrosion.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Corrosion resistance of steels

Date published: 2024-10-15

Publisher: Iron and Steel Institute of Japan

Journal:

• ISIJ International (ISSN: 09151559) vol. 64 issue. 12 ISIJINT-2024-191

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2355/isijinternational.isijint-2024-191

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Updated at: 2024-12-13 12:30:34 +0900

Published on MDR: 2024-12-13 12:30:34 +0900