LD10铝合金微弧氧化膜的生长及腐蚀性能

发布时间：2018-04-23 16:38

本文选题：微弧氧化 + LD铝合金　；参考：《中国表面工程》2015年02期

【摘要】：采用双极性交流电源在LD10铝合金表面制备出微弧氧化膜。测量了硅酸盐电解液里微弧氧化膜的生长曲线,并分析了微弧氧化膜的结构、成分和相组成。采用浸泡腐蚀试验、醋酸加速盐雾腐蚀试验、动电位极化和电化学阻抗谱(EIS)方法评估了微弧氧化处理前后LD10铝合金的腐蚀性能。结果表明:LD10铝合金微弧氧化膜主要由γ-Al2O3组成,膜外层还有少量非晶相。微弧氧化初期,氧化膜主要以向外层生长为主,且表面粗糙度快速增加。随后膜层向内生长速度逐渐加快,最后阶段微弧氧化膜主要以向内生长为主。微弧氧化处理后LD10铝合金的腐蚀电位提高,腐蚀电流密度下降约2个数量级。微弧氧化膜的阻抗模值|Z|比铝合金基体大幅提高,同时其容抗弧半径远远大于铝合金基体。微弧氧化表面处理显著提高了LD10铝合金的耐腐蚀性能。
[Abstract]:The microarc oxide film was prepared on the surface of LD10 aluminum alloy by bipolar AC power supply. The growth curve of micro-arc oxide film in silicate electrolyte was measured, and the structure, composition and phase composition of micro-arc oxide film were analyzed. The corrosion properties of LD10 aluminum alloy before and after micro-arc oxidation were evaluated by immersion corrosion test, accelerated salt spray corrosion test with acetic acid, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that the micro-arc oxidation film of the alloy is mainly composed of 纬 -Al _ 2O _ 3, and a small amount of amorphous phase exists in the outer layer of the film. In the early stage of micro-arc oxidation, the oxide film mainly grows towards the outer layer, and the surface roughness increases rapidly. Subsequently, the growth rate of the film increased gradually, and in the last stage, the micro-arc oxide film mainly grew inward. After micro-arc oxidation, the corrosion potential of LD10 aluminum alloy was increased, and the corrosion current density decreased by about two orders of magnitude. The impedance modulus Z of the micro-arc oxide film is much higher than that of the aluminum alloy substrate, and the arc resistance radius of the micro-arc oxide film is much larger than that of the aluminum alloy substrate. The corrosion resistance of LD10 aluminum alloy was greatly improved by surface treatment of micro-arc oxidation.
【作者单位】：北京师范大学核科学与技术学院;北京市辐射中心;
【基金】：国家自然科学基金(51071031) 北京市自然科学基金(2102018,2122017) 高等学校博士学科点专项科研基金(20120003110010)
【分类号】：TG174.4

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