摘要
采用扫描电镜(SEM/EDX)、失重法、交流阻抗谱和局部交流阻抗研究了纯铝1060在0.004 mol/L Na2SO(4pH=3.1)溶液中的腐蚀行为和规律。研究结果表明,纯铝1060在模拟溶液中连续浸泡720 h后,材料质量损失与浸泡时间的关系符合指数规律即C=A.tn;腐蚀产物形貌为不规则的团状或块状,分析表明腐蚀产物为氢氧化铝和硫酸铝水合物;交流阻抗结果显示纯铝1060腐蚀速率随浸泡时间的延长逐渐降低;局部交流阻抗图谱显示材料表面局部阻抗随时间而变化,并形成点蚀。
The corrosion behavior and mechanism of 1060 aluminum in 0.004 mol/L Na2SO4 solution was investigated using SEM, mass loss, electrochemical impedance spectroscopy （EIS） and local electrochemical impedance spectroscopy （LEIS） method. The results showed that mass loss accords with exponential rule as C=A. t after 720 h immersion. Surface observation showed that corrosion product is agglomerate and accidented; the corrosion product is made of alumina and aluminum sulfate hydrate. The EIS results revealed that the corrosion rate of 1060 aluminum gradually becomes low with increase of immersion time. LEIS results indicated that the local electrochemical impedance on the specimen surface changes with the immersion time and the pitting has occurred.
出处
《装备环境工程》
CAS
2013年第2期4-8,共5页
Equipment Environmental Engineering
基金
国家自然科学基金(50971048)
