6061鋁合金與30CrMnSiA結(jié)構(gòu)鋼在模擬工業(yè)-海洋大氣環(huán)境下的電偶腐蝕防護(hù)Galvanic corrosion and protection of 6061 aluminum alloy coupled with 30CrMnSiA steel in simulative industry-marine atmospheric environment

重點(diǎn)研究6061鋁合金和30CrMnSiA結(jié)構(gòu)鋼在模擬工業(yè)-海洋環(huán)境下的電偶腐蝕防護(hù)。以表面陽極氧化及有機(jī)涂層處理的6061鋁合金、表面鍍鎘及涂層處理的30CrMnSiA結(jié)構(gòu)鋼為實(shí)驗(yàn)材料，將試樣裝配成標(biāo)準(zhǔn)電偶試樣，對(duì)其進(jìn)行氙燈老化和周期浸潤(rùn)實(shí)驗(yàn)，并對(duì)腐蝕后的試樣進(jìn)行分析。結(jié)果表明：僅采用表面陽極氧化處理的6061鋁合金的強(qiáng)度σ_b和塑性δ損失較大，σ_b和δ分別下降了約24.2%和13.4%。而采用環(huán)氧聚酰胺底漆和丙烯酸聚氨酯面漆的復(fù)合防護(hù)涂層的6061鋁合金強(qiáng)度和塑性損失較小，σ_b和δ分別下降約4%和5%。且無涂層試樣的平均點(diǎn)蝕坑深度明顯大于有涂層試樣的，最高相差32 μm，表明此涂層可減弱電偶腐蝕。

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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