物理化学学报 >> 2000, Vol. 16 >> Issue (06): 547-552.doi: 10.3866/PKU.WHXB20000614

研究简报 上一篇    下一篇

Al 6061/SiCp稀土转化膜的组成、结构及性能

于兴文, 曹楚南, 林海潮, 周育红, 周德瑞, 尹钟大   

  1. 中国科学院金属腐蚀与防护研究所，金属腐蚀与防护国家重点实验室，沈阳 110015|哈尔滨工业大学，哈尔滨 150001
  • 收稿日期:1999-09-21 修回日期:1999-11-29 发布日期:2000-06-15
  • 通讯作者: 于兴文

Composition,Structure and Properties of Rare Earth Metal Conversion Coating on Al6061/SiCp

Yu Xing-Wen, Cao Chu-Nan, Lin Hai-Chao, Zhou Yu-Hong, Zhou De-Rui, Yin Zhong-Da   

  1. Institute of Corrosion and Protection of Metals,Chinese Academy of Science,State Key Laboratory for Corrosion and Protection,Shenyang 110015|Harbin Institute of Technology,Harbin 150001
  • Received:1999-09-21 Revised:1999-11-29 Published:2000-06-15
  • Contact: Yu Xing-Wen

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关键词: Al 6061/SiCp复合材料, 稀土转化膜, 耐蚀性, 非晶态

Abstract:

A double layer Rare Earth Metal (REM) conversion coating process of Al 6061/SiCp metal matrix composites (MMC) was studied. The corrosion resistance of REM conversion coating was examined by electrochemical impedance spectroscopy (EIS).REM conversion coating produced very corrosion resistant surface of Al 6061/SiCp MMC. The X ray diffraction (XRD) analysis revealed that REM conversion coatings exhibited non crystalline structure. The composition of REM conversion coating was studied by X ray photoelectron spectroscopy (XPS).The coatings consisted of cerium oxide and hydrated cerium oxide. Some of Ce3+were oxidized to Ce4+during the formation of the first layer coating in the solution containing Ce3+.During the course of exposing the specimens in open air, some of the residual Ce3+were oxidized to Ce4+.REM conversion coating formed in the solution containing Ce4+consisted entirely of Ce4+compounds.

Key words: Al6061/SiCp metal matrix composites, Rare earth metal conversion coating, Corrosion resistance, Non-crystalline structure