EIS Study on the Change of Resistance and Water Absorption during the Failure Graduation of Inorganic Zinc-Rich/Epoxy/Aliphatic Polyurethane Composite Coatings

Authors

Shao-ping HE
Jin-ping XIONG
Yu-ming TANG
Yu ZUO

Abstract

The failure process of inorganic zinc-rich/micaceous iron oxide epoxy/aliphatic polyurethane composite coatings in 3.5% NaCl solution under ultraviolet radiation(UV) was studied with Electrochemical Impedance Spectroscopy(EIS).The result shows that the protective property of the coating was enhanced with the increase of total coating thickness,but the degree of improvement reduced gradully as the coating thickness increased.The shielding effect of the micaceous iron oxide epoxy was mainly reflected in the initial period of the service process,while in later period the coating performance largely depended on the zinc-rich primer.The change of the water uptake in the composite coating presented a 'three-stage' characteristic.The thinner the coating,the quicker the water absorption to get saturation,and the faster the protective property of the coating decreased.

Keywords

composite coating, failure, EIS, coating thickness

DOI Link

https://doi.org/10.61558/2993-074X.3363

Publication Date

2010-11-28

Online Available Date

2010-11-28

Revised Date

2010-11-28

Received Date

2010-11-28

Recommended Citation

Shao-ping HE, Jin-ping XIONG, Yu-ming TANG, Yu ZUO. EIS Study on the Change of Resistance and Water Absorption during the Failure Graduation of Inorganic Zinc-Rich/Epoxy/Aliphatic Polyurethane Composite Coatings[J]. Journal of Electrochemistry, 2010 , 16(4): Article 22.
DOI: 10.61558/2993-074X.3363
Available at: https://jelectrochem.xmu.edu.cn/journal/vol16/iss4/22