6061铝合金与30CrMnSiA结构钢在模拟工业-海洋大气环境下的电偶腐蚀防护Galvanic corrosion and protection of 6061 aluminum alloy coupled with 30CrMnSiA steel in simulative industry-marine atmospheric environment

重点研究6061铝合金和30CrMnSiA结构钢在模拟工业-海洋环境下的电偶腐蚀防护。以表面阳极氧化及有机涂层处理的6061铝合金、表面镀镉及涂层处理的30CrMnSiA结构钢为实验材料，将试样装配成标准电偶试样，对其进行氙灯老化和周期浸润实验，并对腐蚀后的试样进行分析。结果表明：仅采用表面阳极氧化处理的6061铝合金的强度σ_b和塑性δ损失较大，σ_b和δ分别下降了约24.2%和13.4%。而采用环氧聚酰胺底漆和丙烯酸聚氨酯面漆的复合防护涂层的6061铝合金强度和塑性损失较小，σ_b和δ分别下降约4%和5%。且无涂层试样的平均点蚀坑深度明显大于有涂层试样的，最高相差32 μm，表明此涂层可减弱电偶腐蚀。

The galvanic corrosion and protection of 6061 aluminum alloy coupled with 30CrMnSiA steel in simulative industry-marine atmospheric environment was studied. The anodized and organic coated 6061 aluminum alloy and cadmium-plated and organic coated 30CrMnSiA steel were assembled into standard galvanic samples. After xenon lamp aging and alternate immersion, the mechanical properties and microstructures of the samples were investigated. The results show that the strength (σ_b) and toughness (δ) of the anodized 6061 aluminum alloy decrease obviously, σ_b and δ decrease by about 24.2% and 13.4%, respectively. However, σ_b and δ of 6061 aluminum alloy coated with acrylic polyurethane and epoxy polyamide resin composite decrease slightly, only about 4% and 5%, respectively. In addition, the average pitting corrosion depth of the uncoated samples is significantly greater than that of samples with coating, and the maximum difference of the depth is about 32 μm. Therefore, the galvanic corrosion can be reduced by organic coating.

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