高速列车用铝合金环氧底漆的腐蚀行为和湿热老化机理研究

李丽, 李善文, 史洪微, 梁国平, 李春霖, 孙禹, 秦晋, 王伟, 韩恩厚

Corrosion Behavior and Hydrothermal Aging Mechanism of Epoxy Primer on Al-alloy for High-speed Train

LI Li, LI Shanwen, SHI Hongwei, LIANG Guoping, LI Chunlin, SUN Yu, QIN Jin, WANG Wei, HAN En-Hou

表1 环氧底漆/铝合金体系在3.5%NaCl溶液中浸泡不同时间后的EIS拟合结果

Table 1 Fitting results of EIS of epoxy primer coated Al-alloy immersed in 3.5%NaCl solution for different time

Immersion time / h Rc / Ω·cm2 Qc Wc / S·s1/2·cm-2 Y0 / S·sa·cm2 a0 0.5 6.63 × 108 6.10 × 10-10 8.64 × 10-1 - 24 1.45 × 109 5.99 × 10-10 8.65 × 10-1 - 48 1.05 × 1010 3.97 × 10-10 8.93 × 10-1 - 120 1.25 × 1010 4.37 × 10-10 8.90 × 10-1 - 384 1.12 × 1010 4.50 × 10-10 8.92 × 10-1 - 720 1.09 × 1010 4.49 × 10-10 8.93 × 10-1 - 1200 1.70 × 1010 4.14 × 10-10 9.00 × 10-1 - 1680 1.32 × 1010 4.20 × 10-10 8.99 × 10-1 - 2160 1.65 × 1010 4.19 × 10-10 9.00 × 10-1 - 2880 2.23 × 109 4.12 × 10-10 9.04 × 10-1 - 3840 1.81 × 109 5.11 × 10-10 8.87 × 10-1 - 4200 9.79 × 108 4.63 × 10-10 8.98 × 10-1 4.52 × 10-9