尝试用铬和稀土优化HRB400钢筋的耐腐蚀性。

Attempt to Optimize the Corrosion Resistance of HRB400 Steel Rebar with Cr and RE.

作者信息

Liu Tao, Li Nannan, Liu Chao, Li Jingshe, Zhang Tianyi, Cheng Xuequn, Yang Shufeng

机构信息

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

Materials (Basel). 2022 Nov 21;15(22):8269. doi: 10.3390/ma15228269.

DOI:10.3390/ma15228269

PMID:36431753

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9693607/

Abstract

The corrosion resistance of the HRB400 steel rebar alloyed with Cr and rare earths (RE) was systematically studied from two aspects, including the properties of the passive film and the protectiveness of the rust layer. The results presented that Cr increased the corrosion resistance of the steel rebar through stabilizing the passive film and was not involved in the formation of corrosion pits, while the pitting corrosion was initiated by the dissolution of (RE)OS inclusion, resulting in the local acidification at the bottom of the corrosion pits, which decreased the stability of the passive film. As for the long-term corrosion process, both Cr and RE decreased the corrosion rate of the steel rebar, which was related to the promotion effect on the formation of α-FeOOH in the rust layer from Cr and RE.

摘要

对含铬和稀土（RE）的HRB400钢筋的耐蚀性从两个方面进行了系统研究，包括钝化膜性能和锈层的保护作用。结果表明，铬通过稳定钝化膜提高了钢筋的耐蚀性，且不参与腐蚀坑的形成，而点蚀是由（RE）OS夹杂物的溶解引发的，导致腐蚀坑底部局部酸化，降低了钝化膜的稳定性。对于长期腐蚀过程，铬和稀土都降低了钢筋的腐蚀速率，这与它们对锈层中α-FeOOH形成的促进作用有关。