Corrosion protection of the potassium silicate conversion coating

被引：14
作者：
Cheng, Lihong [1 ]
Lou, Feipeng [1 ]
Guo, Weihong [1 ]
机构：
[1] East China Univ Sci & Technol, Sch Mat Sci & Engn, Polymer Proc Lab, Key Lab Preparat & Applicat Ultrafine Mat,Minist, Shanghai 200237, Peoples R China
来源：
VACUUM | 2020年 / 176卷
关键词：
Potassium silicate; Coating; NMR; EIS; Corrosion; NANO-SILICA; RESISTANCE; BEHAVIOR; STEEL; PERFORMANCE;
D O I：
10.1016/j.vacuum.2020.109325
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electrochemical impedance spectroscopy (EIS) and Nuclear magnetic resonance (NMR) were used to investigate the corrosion mechanism of the potassium silicate conversion coating. NMR showed that the coating mainly consists of Q(2), Q(3) and Q(4) structure and then changes to SiO2 after corrosion test. The Q(2) structure in the coating is beneficial for the anticorrosion property of the coating. The impedance of the coating measured at 0.01 Hz reaches 2.8 x 10(6) ohm.cm(2) with a high curing temperature, meaning that the anti-corrosion property of the silicate conversion coating can be improved by a high curing temperature according to EIS analysis.
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页数：8
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