| LIAO Zhong-miao,LI Wen-fang,MU Song-lin,ZHU Wen.The Studies of Film-former Consumption Law in Aluminum Alloy Tita-nium-Zirconium Conversion Coating[J],46(1):51-55 |
| The Studies of Film-former Consumption Law in Aluminum Alloy Tita-nium-Zirconium Conversion Coating |
| Received:July 29, 2016 Revised:January 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.01.009 |
| KeyWord:aluminum alloy titanium-zirconium conversion film consumption law corrosion resistance microstructure ICP-AES |
| Author | Institution |
| LIAO Zhong-miao |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| LI Wen-fang |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| MU Song-lin |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| ZHU Wen |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
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| Abstract: |
| The work aims to further explore consumption law of a novel titanium zirconium-based conversion solution formula used for aluminum alloy during continuous service based on the previously developed formula. The consumption law was studied by determining and analyzing content of main metal ions (titanium, zirconium, M, etc.) in conversion solution during continuous service. Then corrosion resistance and morphology of the conversion film were examined by using electrochemical workstation and SEM. Consumption mass ratio of the main film-forming components (Titanium, Zirconium and M) in the conversion solution was basically unchanged as 5:1:4. The analysis results of XPS showed that the conversion film was mainly composed of metal oxides (TiO2, ZrO2, M2O5 and Al2O3), metal fluoride (ZrF4, AlF3) and metal organic complex. As the film forming proceeded, corrosion resistance of the conversion film decreased, self-corrosion current density increased from 0.11 μA/cm2 up to 1.24 μA/cm2 but was still lower than that of aluminum alloy substrate (7.53 μA/cm2). As the film forming continued, micro cracks on the film surface became wider, no film formed in certain spots on the surface of the aluminum alloy when the 80th specimen formed successively. During the continuous service of titanium zirconium-based conversion solution, consumption ratio of the main film-forming components is basically unchanged, corrosion resistance of the film declined with continuous film forming, and it is necessary to supplement and adjust the conversion solution timely. |
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