物理化学学报 >> 2002, Vol. 18 >> Issue (04): 350-354.doi: 10.3866/PKU.WHXB20020413

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Al 2024-T3合金局部腐蚀的扫描微电极研究

邵敏华;付燕;胡融刚;林昌健   

  1. 厦门大学化学系,固体表面物理化学国家重点实验室,材料科学与工程系,厦门　361005
  • 收稿日期:2001-08-27 修回日期:2001-11-08 发布日期:2002-04-15
  • 通讯作者: 林昌健 E-mail:cjlin@xmu.edu.cn

Localized Corrosion Study of Al 2024T3 Alloy by Scanning Micro reference Electrode Technique

Shao Min-Hua;Fu Yan;Hu Rong-Gang;Lin Chang-Jian   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,Department of Materials Science and Engineering,Xiamen University,Xiamen　361005
  • Received:2001-08-27 Revised:2001-11-08 Published:2002-04-15
  • Contact: Lin Chang-Jian E-mail:cjlin@xmu.edu.cn

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摘要： 应用扫描微电极技术和扫描电子显微镜技术研究Al 2024T3合金在NaCl溶液中开路状态下的局部腐蚀发生的早期过程.实验表明,当Al合金浸入NaCl溶液,其表面即刻发生局部微点腐蚀,这些微点腐蚀与合金表面第二相颗粒密切相关,Al合金表面第二相Al2CuMg颗粒可表现为三种不同的腐蚀行为.

关键词: Al 2024-T3合金, 局部腐蚀, 扫描微参比电极, 扫描电子显微镜

Abstract: The scanning microreference electrode (SMRE) technique and scanning electron microscopy (SEM) were applied to investigate the localized corrosion in its early stage of Al 2024T3 alloy.SMRE potential measurements revealed that localized corrosion occurred on the alloy surface immediately after the exposure to 0.01 mol•L－1 NaCl solution at opencircuit potential,which was more negative than the pitting potential.The potential peaks developed with time and reached the maximum after 2 h exposure.Consequently,the heights of potential peaks would decrease and then maintained a stable value for a long time.SEM indicated the initial of localized corrosion was associated with the second phase particles,especially the Al2CuMg (S phase).Three types of corrosion behavior of S phase were observed.

Key words: Al 2024-T3 alloy, Localized corrosion, Scanning microreference electrode technique, Scanning electron microscopy