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Journal of Chinese Society for Corrosion and protection  2021, Vol. 41 Issue (6): 905-908    DOI: 10.11902/1005.4537.2020.159
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Effect of Post Surface Treatment of Micro-arc Oxidation Films/TC4 Ti-alloy on Their Morphology and Galvanic Corrosion Performance
YANG Sheng1,2, ZHANG Huijie1(), XIANG Wuyuan1, OUYANG Tao1, XIAO Fen1, ZHOU Hui1
1.Hunan Xiangtu Jintian Science and Technology Group Co. Ltd. , Changsha 410012, China
2.Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
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Abstract  

MAO (Micro-arc oxidation) films on TC4 Ti-alloy was prepared, and which then subjected to different post-treatments such as silanization sealing and high temperature oxidation. The MAO/TC4 Ti-alloy before and after post-treatments was characterized by SEM and electrochemical workstation in terms of their surface morphology and performance in galvanic corrosion. The results shows that the surface morphology of the micro-arc oxide film is not significantly changed by high temperature oxidation. TC4 Ti-alloy can easily be suffered from galvanic corrosion when contacting with steel, while the galvanic current density and galvanic corrosion sensitivity of TC4 Ti-alloy couple can be reduced after micro-arc oxidation treatment. The galvanic current density of MAO/TC4 Ti-alloy couple is little affected by silanization sealing treatment, but it is obviously reduced by combined treatments of high temperature oxidation and then silanization sealing.
Key words:  TC4 Ti-alloy      high temperature oxidation      micro-arc oxidation      galvanic corrosion     
Received:  04 September 2020     
ZTFLH:  TG174.4  
Fund: Science and Technology Innovation Project of Hunan Province(2017GK2292);Hunan Province Enterprise Science and technology Innovation and Entrepreneurship Team Support Plan(2018TP2046)
Corresponding Authors:  ZHANG Huijie     E-mail:  349502439@qq.com
About author:  ZHANG Huijie, E-mail: 349502439@qq.com
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Cite this article: 

YANG Sheng, ZHANG Huijie, XIANG Wuyuan, OUYANG Tao, XIAO Fen, ZHOU Hui. Effect of Post Surface Treatment of Micro-arc Oxidation Films/TC4 Ti-alloy on Their Morphology and Galvanic Corrosion Performance. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 905-908.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.159     OR     https://www.jcscp.org/EN/Y2021/V41/I6/905

Fig.1  Morphologies of MAO film (a) and MAO+high temperature oxidation (b)
Fig.2  Morphologies of MAO+silanization treatment (a) and MAO+high temperature oxidation+silanization treatment (b)
Fig.3  Galvanic current-time curves of TC4 Ti-alloy with 925 steels after different treatment
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