文献类型：期刊文献

英文题名：Degradation Behaviors of Two Epoxy Coatings After Dry/Wet-Accelerated Fog Exposure of Different Solutions

作者：Zhang, Jibiao[1];Zhu, Bo[1];Wang, Haoran[2];Zhang, Cheng[2];Zeng, Weixiu[2];Zhou, Qixin[2]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Peoples R China;[2]Univ Akron, Dept Chem Biomol & Corros Engn, Akron, OH 44325 USA

年份：2021

卷号：8

外文期刊名：FRONTIERS IN MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000738723000001)、、EI(收录号：20220111420127)、Scopus(收录号：2-s2.0-85122032718)、WOS

基金：The authors acknowledge the support from the faculty start-up funding from the University of Akron. The authors also appreciate the support from the Science and Technology Plan Project of Guangdong Province (2016A020225004), China, and the Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004), China.

语种：英文

外文关键词：degradation behavior; electrochemical characterization; epoxy coatings; salt fog exposure; apparent performance

外文摘要：Applying organic coating is an important and effective approach for the protection of metal from corrosion. Weathering degradation and under-film corrosion are the two major important factors that cause the failure of organic coatings. In this work, the degradation investigation of two epoxy coatings (clear and pigmented coatings) was carried out under the dry-wet circulation of three different water fog solutions (deionized water, 0.5 wt% NaCl, 0.05 wt% NaCl + 0.35 wt% (NH4)(2)SO4) in 35 days. The apparent performance (pull-off adhesion and surface potentials) and electrochemical features [electrochemical noise and electrochemical impedance spectroscopy (EIS)] of the coating samples were monitored after dry-wet fog exposure. In our three accelerating systems of the fog atmosphere, the time that the detectable defects appeared on the surface of coating samples was far ahead in the mixed salt solution than that in the deionized water or 0.5 wt% NaCl solution. For a defective or damaged coating surface, the derived results by using the standard deviation method (SDM) or Fourier power spectrum (FPS) were rather higher than those obtained from EIS as a whole, while for the same coating, the degradation trend with time derived from EIS, SDM, FPS, and scanning Kelvin probe was consistent with each other.