摘要
为了更好地了解铝合金型材经阳极氧化处理后的耐腐蚀情况,在相同条件下对6063型铝合金和阳极氧化样做铜加速乙酸盐雾腐蚀试验(CASS)并进行了对比。用电子天平测定腐蚀失重,用扫描电镜(SEM)和能谱仪(EDS)对腐蚀微观形貌及腐蚀产物成分进行了分析。结果表明:阳极氧化膜为由阻挡层和多孔层组成的多孔性膜,能阻碍Cl-等的侵入,从而大幅度提高了铝合金的耐蚀性能;阳极氧化膜的腐蚀从晶界开始,蚀孔小且分布均匀,腐蚀质量损失与时间呈幂函数关系,在一定时间内腐蚀速率会呈现短暂增大趋势,随着腐蚀时间继续延长会出现再钝化过程,直至氧化膜完全腐蚀破裂,腐蚀产物由O,Al,P 3种主要元素及少量的Cl,S元素组成。
Copper accelerated acetic acid salt spray corrosion tests of 6063 aluminum alloy and its anodic oxidation film were performed under the same conditions.The corrosion weight loss was measured with an electronic balance,while the corroded surface morphology and corrosion product composition were analyzed by scanning electron microscopy and energy dispersive spectrometry.Results showed that the anodic oxidation film on the Al alloy surface consisted of a barrier layer and a porous layer,and it was able to prevent the attack by Cl^- thereby greatly improving the corrosion resistance of the Al alloy.The corrosion of the anodic oxidation film initiated at the grain boundary,and the corroded pores were small in size and exhibited uniform size distribution.Moreover,the corrosion mass loss was proportional to time in power function mode,and the corrosion rate of the anodic oxidation film was dominated by a transitory increase in a certain period of time.With further extending time of corrosion,re-passivation occurred until the anodic oxidation film was totally corroded and broken.Besides,the corroded products mainly consisted of O,Al and P elements,accompanied by a small amount of Cl and S elements.
出处
《材料保护》
CAS
CSCD
北大核心
2015年第3期46-47,51,共3页
Materials Protection
关键词
阳极氧化膜
铝合金
盐雾腐蚀
耐蚀性
anodic oxidation film
aluminum alloy
salt-spray corrosion
corrosion resistance
