Citation: LIU Yan, WEI Zhong-Ling, YANG Fu-Wei, ZHANG Zhao. Anodizing of AZ91D Magnesium Alloy in Borate-Terephthalic Acid Electrolyte[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2385-2392. doi: 10.3866/PKU.WHXB20110931 shu

Anodizing of AZ91D Magnesium Alloy in Borate-Terephthalic Acid Electrolyte

1.
1. Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China;
2. Magnesium Technology Co., Ltd, Chinese Academy of Sciences, Jiaxing 314051, Zhejiang Province, P. R. China;
3. Department of Chemistry, Tianshui Normal University, Tianshui 741000, Gansu Province, P. R. China

Received Date: 16 March 2011
Available Online: 27 July 2011
Fund Project: 国家自然科学基金(50771092, 21073162) (50771092, 21073162) 上海市重点基础研究项目(08JC1421600) (08JC1421600)嘉兴市科技领军人才计划项目(2008AZ2018)资助 (2008AZ2018)

Anodizing a AZ91D magnesium alloy in environmentally friendly borate-terephthalic acid (TPA) electrolyte was studied. The effect of TPA on the anodizing process and the properties of the resultant anodized film were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results showed that the anodizing process, the surface morphology, thickness, phase structure, and corrosion resistance of the anodized film were strongly dependent on the concentration of TPA. In the presence of adequate TPA, a moderate anodizing process was obtained. The current density of the anodizing process was reduced and excessive sparking in the anodizing process was obviously inhibited. In the presence of TPA, the quality of the anodized film improved. The film became more compact and smooth in structure. The thickness of the film decreased slightly. The interface between the anodized film and the magnesium substrate became indistinct indicating a better adhesion between them. The corrosion resistance of the anodized film was obviously enhanced. From these highly positive results, TPA can be used as an effective additive for the anodizing treatment of magnesium alloy. The proposed anodizing process is of importance to make the existing anodizing process 'greener' and to improve the quality of the anodized film.
- Anodizing,
- Environmentally friendly electrolyte,
- Magnesium alloy,
- Terephthalic acid,
- Corrosion resistance
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