(1. 北京科技大學(xué) 腐蝕與防護(hù)中心，北京 100083；
2. 北京科技大學(xué) 腐蝕與防護(hù)教育部重點實驗室，北京 100083；
3. 桂林理工大學(xué) 有色金屬及材料加工新技術(shù)教育部重點實驗室 材料科學(xué)與工程學(xué)院，桂林 541004)
摘 要: 重點研究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)鋼為實驗材料，將試樣裝配成標(biāo)準(zhǔn)電偶試樣，對其進(jìn)行氙燈老化和周期浸潤實驗，并對腐蝕后的試樣進(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σb和塑性δ損失較大，σb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，σb和δ分別下降約4%和5%。且無涂層試樣的平均點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。
關(guān)鍵字: 6061鋁合金；30CrMnSiA結(jié)構(gòu)鋼；大氣腐蝕；電偶腐蝕；有機(jī)涂層；力學(xué)性能
（1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;
2. Key Laboratory for Corrosion and Protection, Ministry of Education, University of Science and Technology Beijing,
Beijing 100083, China;
3. Key Laboratory of Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China）
Abstract: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 (σb) and toughness (δ) of the anodized 6061 aluminum alloy decrease obviously, σb and δ decrease by about 24.2% and 13.4%, respectively. However, σb 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.
Key words: 6061 aluminum alloy; 30CrMnSiA steel; atmospheric corrosion; galvanic corrosion; organic coating; mechanical property
