摘要
采用恒流法,在铝酸盐系电解液中对5083铝合金进行微弧氧化处理。并利用扫描电镜和动电位极化曲线等手段,研究了不同电流密度下制备的陶瓷层的微观形貌及耐蚀性。结果表明:随电流密度的提高,更多的氧化物沉积在膜层表面,使之厚度增大。当电流密度为3.5 A·cm^(-2)时,陶瓷层的自腐蚀电位正移至-0.493 V,自腐蚀电流密度降至3.64×10^(-7)A·cm^(-2)。从而,微弧氧化陶瓷层显著提高了基体铝合金的表面耐蚀性。
With constant current mode, the micro-arc oxidation coating was prepared on the surface of 5083 Al alloy by micro-arc oxidation （MAO） technique in aluminate electrolyte. The morphology and corrosion resistance of the MAO coating obtained under different current densities were investigated using SEM and polarization curves. The results show that with the current density increasing, more oxides accumulate on the film surface, and the coating is thickened. When the current density is 3.5 A.cm-2, the corrosion potential of the ceramic layers is moved in the positive direction to -0.493 V and the corrosion current density decreases to 3.64 × 10-7 A. cm-2. Therefore, MAO coatings can significantly improve the corrosion resistance of the surface of aluminum alloy matrix.
出处
《热加工工艺》
CSCD
北大核心
2015年第8期164-165,168,共3页
Hot Working Technology
关键词
微弧氧化
铝合金
电流密度
耐蚀性
micro arc oxidation
aluminum alloys
current density
corrosion resistance
