The function of Cr on the rust formed on weathering steel performed in a simulated tropical marine atmosphere environment

被引：70
作者：
Zhang, Tianyi [1 ]
Xu, Xuxue [1 ]
Li, Yong [2 ,3 ]
Lv, Xuewei [2 ,3 ]
机构：
[1] Univ Sci & Technol Beijing, Corros & Protect Ctr, Inst Adv Mat & Technol, Key Lab Corros & Protect MOE, Beijing 100083, Peoples R China
[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
[3] Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & Adv Mat, Chongqing 400044, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 277卷
基金：
中国博士后科学基金;
关键词：
Weathering steel; Cr; Rust layer; XPS; Tropical marine atmosphere;
D O I：
10.1016/j.conbuildmat.2021.122298
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The atmospheric corrosion behavior of weathering steels (WSs) with dissimilar Cr contents was studied through dry/wet cycling corrosion tests combined with electrochemical measurements and characterizations of morphology and composition of the rusts. The results presented that the corrosion rates of WSs decreased as the Cr contents in WSs increased, which manifested as an increase in the impedance for rust layers after various corrosion periods. The enriched area of Cr in the inner rust layer was more evident in blocking the invasion of Cl-, which is related to the positive ion selectivity of the rust. High content of Cr in steel promotes the generation of Cr(OH)(3) and Cr2O3, which acted as nucleation sites for the formation of Fe3O4 and alpha-FeOOH, presenting high value of alpha*/gamma (the sum of alpha-FeOOH and Fe3O4 / gamma-Fe2O3 to gamma-FeOOH). (C) 2021 Elsevier Ltd. All rights reserved.
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页数：11
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