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Citation: Shao Min-Hua, Fu Yan, Hu Rong-Gang, Lin Chang-Jian. Localized Corrosion Study of Al 2024T3 Alloy by Scanning Micro reference Electrode Technique[J]. Acta Physico-Chimica Sinica, ;2002, 18(04): 350-354. doi: 10.3866/PKU.WHXB20020413 shu

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

1.
State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,Department of Materials Science and Engineering,Xiamen University,Xiamen　361005

Received Date: 27 August 2001
Available Online: 15 April 2002

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.
- Al 2024-T3 alloy;Localized corrosion;Scanning microreference electrode technique;Scanning electron microscopy
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