铝合金焊接区喷射式微弧氧化陶瓷层耐腐蚀性研究

发布时间：2018-04-08 15:24

本文选题：铝合金　切入点：焊接区　出处：《表面技术》2015年12期

【摘要】：目的研究喷射式微弧氧化对改善铝合金焊接区耐腐蚀性能的可行性。方法使用自行研制的喷射式微弧氧化设备,在铝合金焊接区表面制备一层陶瓷膜,并在同等参数下制备一层浸入式微弧氧化陶瓷层进行对比。通过扫描电镜观察陶瓷膜表面和截面的微观形貌,并对陶瓷膜截面进行元素分析;分别利用铜加速盐雾腐蚀实验和动电位极化实验检测陶瓷膜的耐腐蚀性能,分析陶瓷膜的耐腐蚀性能。结果两种方法制备的陶瓷膜微观形貌相似,表面都有许多"火山口"状产物并伴有裂纹,截面疏松多孔,主要元素为Al和O;经240 h盐雾腐蚀后,3种试样均有不同程度的腐蚀,其中铝合金焊接基体腐蚀最严重,浸入式、喷射式次之,其腐蚀失重率分别是0.0072,0.0039,0.0023 g/cm2;极化曲线显示,铝合金基体、焊接基体、浸入式陶瓷膜、喷射式陶瓷膜腐蚀电位分别为-0.794,-0.742,-0.615,-0.578 V,耐腐蚀性依次增强。结论喷射式微弧氧化陶瓷层耐腐蚀性能表现较好,基本达到制备要求,在不适于浸入式微弧氧化的条件下可采用喷射式方法处理。
[Abstract]:Objective to study the feasibility of spray micro-arc oxidation to improve corrosion resistance of aluminum alloy welding zone.Methods A ceramic film was prepared on the surface of aluminum alloy welding area by using the spray arc oxidation equipment, and a ceramic layer immersed in micro-arc oxidation was prepared under the same parameters for comparison.The surface and cross section of ceramic film were observed by scanning electron microscope (SEM), and the elements of ceramic film were analyzed. The corrosion resistance of ceramic film was tested by copper accelerated salt spray corrosion test and potentiodynamic polarization test, respectively.The corrosion resistance of ceramic film was analyzed.Results the microcosmic morphology of the ceramic films prepared by the two methods was similar. There were many "crater" products with cracks on the surface, the cross section was porous, the main elements were Al and O, and after 240 h salt spray corrosion, all three kinds of samples were corroded to varying degrees.The corrosion of aluminum alloy is the most serious, immersion type is the second, jet type is the second, and its corrosion loss rate is 0.0072 ~ 0.0039 ~ 0.0023 g / cm ~ 2. The polarization curve shows that aluminum alloy substrate, welding substrate, immersion ceramic film,The corrosion potential of the sprayed ceramic film is -0.794- 0.742U -0.615C -0.578V, and the corrosion resistance is enhanced in turn.Conclusion the corrosion resistance of spray micro-arc oxidation ceramic coating is better and can meet the requirements of preparation basically. The spray method can be used to treat the ceramic coating under the condition that it is not suitable for immersion micro-arc oxidation.
【作者单位】：装甲兵工程学院装备维修与再制造工程系;
【基金】：装备预先研究项目(51327040101)~~
【分类号】：TG174.45

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