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材料工程  2015 

硝酸铈封闭对2A12铝合金己二酸-硫酸阳极氧化膜耐蚀性的影响

DOI: 10.11868/j.issn.1001-4381.2015.01.005, PP. 24-29

Keywords: 铝合金,己二酸-硫酸,阳极氧化膜,封闭,硝酸铈

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Abstract:

研究了硝酸铈溶液封闭对2A12铝合金己二酸-硫酸阳极氧化膜耐蚀性的影响,通过盐雾腐蚀实验、电化学动电位极化扫描法和电化学阻抗谱法(EIS)对阳极氧化膜的耐蚀性进行研究,采用场发射扫描电镜(FE-SEM)观察试样封闭前后的表面微观形貌,并与稀铬酸封闭、沸水封闭传统工艺进行比较.结果表明采用硝酸铈溶液封闭的2A12铝合金阳极氧化膜腐蚀电流减小,阻抗值增大,耐腐蚀性增强.阳极氧化膜表面呈致密的花瓣状,多孔层内及氧化膜表面附着一层致密铈的氧化物或氢氧化物,其耐蚀性优于沸水封闭,与稀铬酸封闭相当.

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