Evolution of corrosion degradation in galvanised steel bolts exposed to a tropical marine environment

被引:11
作者
Daniel, Enobong Felix [1 ,2 ,5 ]
Wang, Changgang [1 ,2 ,5 ]
Li, Chao [1 ,2 ]
Dong, Junhua [1 ,2 ,5 ]
Udoh, Inime Ime [3 ]
Zhang, Dongjiu [4 ]
Zhong, Wenan [4 ]
Zhong, Sheng [4 ]
机构
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[3] Shenyang Ligong Univ, Sch Environm & Chem Engn, Shenyang 110159, Peoples R China
[4] Xichang Satellite Launch Ctr, Key Lab Space Launching Site Reliabil, Haikou 571126, Hainan, Peoples R China
[5] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 27卷
基金
中国国家自然科学基金;
关键词
Bolt-nut fastener; Galvanised steel; Bolt threads; Crevice; Chloride ions; Atmospheric corrosion; ATMOSPHERIC CORROSION; CARBON-STEEL; RAMAN-SPECTROSCOPY; IRON-OXIDES; ZINC; COATINGS; PRODUCTS; ALUMINUM; BEHAVIOR; INSIGHT;
D O I
10.1016/j.jmrt.2023.10.295
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The time-dependent degradation of galvanised steel bolts subjected to marine atmospheric exposure for a maximum period of 2 years in the Wenchang marine environment of Hainan province, South China, was investigated. The results showed that the zinc coating used as a protective surface finish deteriorated quickly due to the harsh environmental conditions. The deterioration of the zinc coating resulted in premature corrosion of the underlying steel substrate as early as 6 months. The main Zn corrosion products found at the initial exposure time were simonkollite (Zn5(OH)8Cl2 center dot H2O), hydrozincite (Zn5(OH)6(CO3)2), and zincite (ZnO). At subsequent exposure times, major steel corrosion products such as lepidocrocite (gamma-FeOOH), akaganeite (13-FeOOH), goethite (alpha-FeOOH), magnetite (Fe3O4), and maghemite (gamma-Fe2O3) were detected. Fe3O4/gamma-Fe2O3 was consistently found in the rust formed at both the exposed and crevice thread regions between 6 and 24 months of exposure. Based on the geometry of the bolt fastener, the corrosion rate and phase composition distribution varied between the two regions. Differences in oxygen exposure levels, corrosion kinetics, and electrochemical stability of the corrosion products were primary factors in these distinctive corrosion behaviours.
引用
收藏
页码:5177 / 5190
页数:14
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