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

IF 1.6 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Isij International Pub Date : 2024-09-03 DOI:10.2355/isijinternational.isijint-2024-191

Chihiro Hayama, Mariko Kadowaki, Yoshiharu Murase, Hideki Katayama, Toru Hara, Yuka Hara, Hikari Watanabe, Isao Shitanda, Masayuki Itagaki

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Abstract

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.

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添加 P 对生锈前后钢材耐腐蚀性的影响

本研究探讨了添加 P 对锈蚀形成前后钢材耐腐蚀性的影响。对含 P 钢（Fe-0.5 质量% P、Fe-1.0 质量% P 和 Fe-1.5 质量% P）进行了电化学测量和表面分析，以分析 P 对其生锈前初始耐腐蚀性的影响。结果表明，随着 P 含量的增加，钢材的初始耐腐蚀性能有所下降。根据 SEM/EDS 进行的表面分析，P 含量越高，晶界处的 P 偏析越多。极化测量结果表明，这些 P 偏析成为局部腐蚀的起始点，导致初始耐腐蚀性能下降。虽然初始耐腐蚀性能随着 P 含量的增加而变差，但长期耐腐蚀性能却呈现出相反的趋势，随着 P 含量的增加而提高。宫古岛的大气暴露试验和锈层表面分析表明，P 已融入锈层，并增强了抗腐蚀保护能力。

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来源期刊

Isij International 工程技术-冶金工程

CiteScore

3.40

自引率

16.70%

发文量

268

审稿时长

2.6 months

期刊介绍： The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.