Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (04): 350-354.doi: 10.3866/PKU.WHXB20020413

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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

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