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Microstructure and flow accelerated corrosion resistance of Cr coatings electrodeposited in a trivalent chromium bath
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.surfcoat.2021.127527
Ying Wang 1 , Yanhong Liu 2 , Guangbin Li 1 , Mingmin Zheng 2 , Yusha Li 1 , Anlei Zhang 1 , Yingchun Zhang 1
Affiliation  

In this study, Cr coatings were electrodeposited on carbon steel substrates by a trivalent Cr salt. The microstructure of the Cr coatings and their flow accelerated corrosion (FAC) resistance in simulated secondary circuit environments (10 MPa and 150 °C) of nuclear power plants were investigated. The results showed that the as-deposited coating was amorphous and crack-free. Annealing at 200 °C resulted in the decrease of Cr (OH)3 and the increase of Cr and Cr2O3 on the coating surface, which improved the corrosion resistance of the coating. The subsequent FAC test showed that the Cr coatings significantly improved the FAC resistance of the carbon steel substrate. The coating annealed at 200 °C exhibited better FAC resistance. The Cr-rich oxide film formed on the coatings was mainly Cr2O3, with a small amount of Cr and CrO2. Due to the galvanic effects caused by pinhole defects, abnormally grown annular deposits formed on the coating surface.



中文翻译:

三价铬浴中电沉积铬涂层的显微组织和流动加速腐蚀性能

在这项研究中,Cr 涂层通过三价 Cr 盐电沉积在碳钢基材上。研究了 Cr 涂层的微观结构及其在核电厂模拟二回路环境(10 MPa 和 150 °C)中的流动加速腐蚀(FAC)抗性。结果表明,沉积态涂层是无定形且无裂纹的。200℃退火导致Cr (OH) 3减少,Cr和Cr 2 O 3 增加在涂层表面,提高了涂层的耐腐蚀性。随后的 FAC 测试表明,Cr 涂层显着提高了碳钢基材的 FAC 抗性。在 200 °C 下退火的涂层表现出更好的 FAC 抗性。涂层上形成的富铬氧化膜主要为Cr 2 O 3,少量Cr和CrO 2。由于针孔缺陷引起的电偶效应,在涂层表面形成异常生长的环形沉积物。

更新日期:2021-07-23
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