摘要
为了考察低红外发射率涂层的防护效果,利用腐蚀电化学手段研究了以聚氨酯为粘合剂,分别以铜粉、硅烷偶联剂改性铜粉、丙烯酸改性铜粉为填料的三种低红外发射率涂层在模拟海水(3.5wt.%NaCl溶液)环境中对于碳钢基体的电化学腐蚀防护行为,比较了该三种涂层体系的防腐蚀性能。结果表明:在浸泡初期,添加改性填料的两种涂层表现出较好的防腐蚀性能,但随着浸泡时间延长,该两种涂层失效速率加快;而添加未改性填料的涂层在整个浸泡过程中的防腐蚀性能最好。根据涂层试样的电化学参数与涂层特征频率推测,在长期浸泡过程中,由填料改性所引入的亲水基团-COOH、-OC2H5促进了水向涂层内部的渗入,从而影响了含有改性填料涂层的长期防护性。
Electrochemical measurement techniques were employed to investigate the electrochemical corrosion resistance of three low infrared emissivity coatings in which polyurethane is as matrix and filled with Cu powder, Cu powder modified by silane coupling agent, and Cu powder modified by acrylic acid respectively in simulated sea water（3.5 wt. % NaCl）. The corrosion-resistance properties of the three coating systems were compared. The results show that at the initial stage of immersion, both coatings filled with modified Cu powder are of better corrosion-resistance properties, but tend to easy to be failure as time of immersion prolonged. The coating filled with unmodified Cu powder shows a better corrosion-resistance during the long term immersion. According to speculation of electrochemical parameter and breakpoint frequency of the samples, it is estimated that the presence of hydrophilic groups, such as -COOH and -OC2H5, in the polymer network of coatings, which are introduced by Cu powder modification, may cause an accelerated failure of the coating＇s protection properties in the long-term immersion due to the permeation of water through the coatings.
出处
《红外技术》
CSCD
北大核心
2010年第4期217-222,共6页
Infrared Technology
基金
武器装备预研项目
国家自然科学基金重大研究计划
编号90505008973项目
关键词
低红外发射率涂层
腐蚀防护
极化曲线
交流阻抗
low infrared emissivity coatings, corrosion protection, polarization curves, electrochemical impedance spectrums
