期刊
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
卷 57, 期 6, 页码 636-643出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1023193520120265
关键词
enamel coating; corrosion; through porosity; inner tank of electric water heater; hot tap water; EIS
资金
- National Natural Science Foundation of China [U1960103, U1660205]
The through defects in enamel coating facilitate solution penetration and the formation of occluded corrosion cell on the steel substrate, resulting in low resistances to ionic transport and active corrosion. Steel corrosion is mainly controlled by the oxygen diffusion via enamel coating defects, along with the transport of anion ions and corrosion products.
The corrosion behavior of enamel coating on carbon steel was investigated in the tap water at 80 degrees C (i.e., the simulated electric hot water tank environments) by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical measurement techniques. The through porosity of enamel coating is about 0.0076%, simply measured by in-situ electrochemical impedance spectroscopy (EIS) in the dilute sulfuric acid solution. The through defects facilitate the solution penetration in the coating and the formation of occluded corrosion cell on the steel substrate in the hot tap water. The occluded zones have low resistances to both ionic transport and active corrosion. The steady steel corrosion is controlled by the oxygen diffusion via the enamel coating defects, which is accompanied by the transport of anion ions and corrosion products.
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