高等学校化学学报

高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (5): 817.doi:

• 研究论文 • 上一篇    下一篇

AZ91D镁合金上钼改性锌系磷化膜的制备、 结构及性能

李光玉, 连建设, 牛丽媛, 江中浩, 蒋青   

  1. 吉林大学材料科学与工程学院, 汽车材料教育部重点实验室, 长春 130025
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-05-10 发布日期:2006-05-10
  • 通讯作者: 连建设

Preparation, Structure and Properties of Molybdate Modified Zinc Phosphate Coating on Magnesium Alloy AZ91D

LI Guang-Yu, LIAN Jian-She*, NIU Li-Yuan, JIANG Zhong-Hao, JIANG Qing   

  1. Key Laboratory of Automobile Materials, Ministry of Education, College of
    Materials Science and Engineering, Jilin University, Changchun 130025, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-05-10 Published:2006-05-10
  • Contact: LIAN Jian-She

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被引次数

55

摘要：

采用在磷化液中添加钼酸钠及腐蚀抑制剂的方法, 在AZ91D 镁合金表面上制备了均匀细致的锌系复合磷化膜. 用XRD对膜层的化学组成及结构进行了表征,用SEM和EDS对膜层的形貌和组分含量进行分析. 结果表明, 磷化膜主要由Zn3(PO4)2·4H2O和单质Zn组成. 在磷化液中加入钼酸钠使磷化膜组织更加细致而且无裂纹. 磷化液中的钼酸钠含量为1.5 g/L时, 磷化膜的结晶最致密, 单质锌的含量最高, 耐蚀性最好. 还提出了一种快速测量镁合金表面膜层耐蚀性的试验方法, 同时对镁合金上的磷化反应的机理进行了探讨.

关键词: 镁合金; 锌系磷化; 耐蚀性; 钼酸钠

Abstract:

Uniform and dense molybdate modified zinc phosphate coatings were formed on the magnesium alloy AZ91D surfaces by using a phosphating bath containing molybdtate and corrosion inhibitor. Phase components of coatings were analyzed by XRD. Morphology and compositions of coatings were analyzed by SEM and EDS. The results indicate that the phosphate coatings consist mainly of Zn3(PO4)2·4H2Oand Zn. When molybdate was added in the bath, phosphate coatings became denser and crackfree. The phosphate coatings obtained from the bath containing 1.5 g/L sodium molybdate exhibit denser microstructure and higher concentration of metallic zinc. A corrosion test estimating the corrosion resistance of conversion coating on magnesium alloy was proposed. Phosphating reaction mechanism on the magnesium alloy AZ91D surfaces was also investigated.

Key words: Magnesium alloy; Zinc phosphating; Corrosion resistivity; Sodium molybdate

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