Study of effects of rare earth elements on the corrosion behavior of weathering steels under a simulated immersion environment and a real atmospheric environment

IF 1.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zengwei Fan, Zhong Xi, Tengshi Liu, Xintong Lian, Xicheng Wei, Han Dong
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Abstract

The effects of rare earth elements (REEs) on the corrosion behavior of weathering steels under a simulated immersion environment and a real atmospheric environment have been investigated in this paper. Although the corrosion rate of the indoor accelerated corrosion experiment (0.01 mol/L NaHSO3) is much higher than that of the real atmospheric exposure experiment, the addition of REEs can highly improve the corrosion resistance of test steels under both conditions. The improvement of the corrosion resistance can be attributed to the quick transformation of γ-FeOOH into α-FeOOH and the accelerated formation of a stable rust layer by REEs. Furthermore, the segregation of the REE inner rust layer increases the density of the rust layer and prevents corrosive particles from eroding the matrix. REEs can also promote the segregation of Cu, Cr, and other alloying elements in the rust layer, thus blocking the cracks and holes and enabling the formation of a continuous rust layer with good adhesion.

Abstract Image

研究稀土元素对模拟浸泡环境和真实大气环境下风化钢腐蚀行为的影响
本文研究了稀土元素 (REE) 在模拟浸泡环境和真实大气环境下对风化钢腐蚀行为的影响。虽然室内加速腐蚀实验(0.01 mol/L NaHSO3)的腐蚀速率远高于真实大气暴露实验的腐蚀速率,但在这两种条件下,稀土元素的添加都能极大地提高试验钢的耐腐蚀性。耐腐蚀性能的提高可归因于 REEs 可使 γ-FeOOH 快速转化为 α-FeOOH,并加速形成稳定的锈层。此外,REE 内锈层的偏析可增加锈层的密度,防止腐蚀颗粒侵蚀基体。稀土元素还能促进锈层中铜、铬和其他合金元素的偏析,从而堵塞裂缝和孔洞,形成具有良好附着力的连续锈层。
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来源期刊
Materials and Corrosion-werkstoffe Und Korrosion
Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学:综合
CiteScore
3.70
自引率
11.10%
发文量
199
审稿时长
1.4 months
期刊介绍: Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.
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