采用CASS实验、浸泡实验、交流阻抗和扫描开尔文研究羟烷基酰胺固化聚酯粉末涂层缺陷在海洋环境中的腐蚀行为和机制.结果表明:羟烷基酰胺固化聚酯粉末涂层经240h CASS实验后划痕边沿有少量起泡,最大单边腐蚀宽度小于0.5mm,表面附着力为0级;EIS图谱显示涂层下铝合金在0.6mol/L NaCl溶液中的腐蚀速率随浸泡时间的延长不断降低并逐渐趋于稳定;扫描开尔文图谱显示聚酯粉末涂层下金属的腐蚀沿划痕处不断向涂层两侧扩散,其阳极和阴极交替变化,导致涂层下腐蚀面积扩大.
The corrosion behavior of primid-curing solidified polyester powder coating defects in marine environment was investigated by CASS test, immersion test, electrochemical impedance spectroscopy (EIS) and scanning Kelvin probe (SKP).The results show that the primid-curing polyester powder coating has a small amount of blisters along the scratch edge, the maximum single side corrosion width is less than 0.5mm, and the surface adhesion is 0 after 240 hours′ CASS test.The EIS map in 0.6mol/L NaCl solution exhibits that the corrosion rate of aluminum alloy is decreased with increasing immersion time and gradually stable.The scanning Kelvin spectrum reveals that the corrosion of the metal under the coating of the polyester powder is extended from scratch to the coating, the anode and the cathode are alternately changed, which leads to the expansion of the corrosion area.
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