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中文摘要：
通过青岛大气暴露实验,对比了未处理和经硫硼酸阳极化处理的7050铝合金在典型工业海洋大气环境中的腐蚀行为。采用失重法获得腐蚀速率;使用扫描电镜对腐蚀产物进行微观形貌观察;使用EDS和XRD对腐蚀产物进行元素分析和相组成分析;运用电化学阻抗法对腐蚀产物层及氧化膜层的保护作用进行分析。结果表明：未处理的7050铝合金暴露2 a后,产生了大面积的剥蚀,腐蚀产物主要为Al（HSO_4）_3·6H_2O,Al_4SO_4（OH）10·5H_2O和NaAlSi_3O_8。硫硼酸阳极化处理的7050铝合金在青岛大气中暴露2 a后,局部出现点蚀,氧化膜对基体仍有良好的保护作用。硫硼酸阳极氧化预处理可以大幅度提高7050铝合金的耐蚀性。
英文摘要：
Corrosion behavior of 7050 Al-alloy, which was pre- anodized in electrolyte of boric- and sulfuric-acid, was assessed through field exposure in industrial-marine atmosphere for 2 a at Qingdao area. The corrosion rate was acquired from the relevant mass-lost data. The surface mor- phology, distribution of elements and the phase compositions of corrosion products were character- ized by SEM, EDS and XRD, as well as the protectiveness of product scale and anodic film was eval- uated by using EIS. It is indicated that the bare Al suffered from severe exfoliation corrosion with an- nual corrosion rate of 5.92μ m·a^-1, and its corrosion product mainly consists ofAI（HSO4）3·6H2O,Al4SO4（OH）10· 5H2O and NaAlSi3O8·, the formed corrosion product scale on the bare Al can pro- vide protectiveness to the substrate to some extent, however, the anodized film can provide much better protectiveness in comparison with the formed oxide scale on bare Al.
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