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Alternative title: Effect of P Addition on the Corrosion Resistance of Steels Before and After Rust Formation

Description:

This paper presents the effect of P addition on the corrosion resistance of steels before and after rust formation. Electrochemical measurements and surface analyses 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 was worse with higher P content. According to the surface analysis conducted by SEM/EDS, more P-segregations at grain boundaries existed with higher P content. Based on the results of polarization measurements, it was considered that these P-segregation became the initiation sites of localized corrosion, resulting in the decrease in the initial corrosion resistance.
Although the initial corrosion resistance was worse with higher P content, the long-term corrosion resistance was better with higher P content. According to the results of atmospheric exposure tests at Miyakojima and the surface analysis of rust layers, P was incorporated into the rust layer, and it promoted the protective ability against corrosion.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: 腐食, さび, 鉄鋼材料, Fe-P合金, リン, 偏析

Date published: 2024-05-01

Publisher: Nippon Tekko Kyokai/Iron and Steel Institute of Japan

Journal:

• TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN (ISSN: 18832954) vol. 110 issue. 7 p. 548-557

Funding:

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

MDR DOI:

First published URL: https://doi.org/10.2355/tetsutohagane.TETSU-2024-005

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Updated at: 2024-12-20 16:31:23 +0900

Published on MDR: 2024-12-20 16:31:23 +0900