首页|NaOH浓度对铸造铝锂合金微弧氧化膜层显微组织和耐蚀性能的影响

NaOH浓度对铸造铝锂合金微弧氧化膜层显微组织和耐蚀性能的影响

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采用含有Na2WO4和不同NaOH浓度的硅酸盐系列电解液,利用微弧氧化(MAO)技术在Al-Cu-Li合金表面制备陶瓷涂层,研究NaOH浓度在1-9 g/L范围内对涂层显微组织和腐蚀行为的影响.利用X射线衍射(XRD)、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)对膜层的组成和微观结构进行表征.结果表明,NaOH促进MAO反应中氧化物的生成,使膜层厚度增加.电化学腐蚀测试(极化曲线、交流阻抗谱)和质量损失试验确定膜层的耐蚀性随NaOH加入量的增加而提高,且在7 g/L NaOH溶液中制备的膜层耐蚀性最优.全浸泡腐蚀试验也给出一致的结果.
Effect of NaOH concentration on microstructure and corrosion resistance of MAO coating on cast Al-Li alloy
Ceramic coating was prepared on cast Al-Cu-Li alloy by micro-arc oxidation (MAO) in a silicate electrolyte solution with additives including Na2WO4 and NaOH. The effect of NaOH addition varying from 1 to 9 g/L on the microstructure and corrosion behavior of the coatings was investigated. The coating was characterized by XRD, XPS and SEM with respect to the composition and microstructures. The results show that NaOH promoted the formation of oxides in the reaction of MAO and contributed to the increase of layer thickness. Electrochemical tests (polarization curve and EIS) and mass loss test indicate that the corrosion resistance of the coated Al-Cu-Li alloy was improved with the increased addition of NaOH. Moreover, the results prove that the alumina coating formed in the electrolyte with 7 g/L NaOH showed the best corrosion resistance. The examination of the full immersion corrosion test presents the same result of corrosion resistance.

Al-Cu-LiNaOHmicro-arc oxidationcorrosion behavior

秦莹、吴国华、Andrej ATRENS、张小龙、张亮、丁文江

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上海交通大学 材料科学与工程学院,轻合金精密成形国家工程研究中心,金属基复合材料国家重点实验室,上海 200240

School of Mechanical and Mining Engineering, the University of Queensland, Brisbane Qld, 4072, Australia

Al-Cu-Li NaOH 微弧氧化 腐蚀行为

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaUnited Fund of National Department of Education and Equipment DevelopmentNational Key R&D Program of China

51871148518210016141A020332452016YFB0301003

2021

10.1016/S1003-6326(21)65549-8

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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