Effect of Process Parameters on Corrosion Resistance of Anodizing Film on 2195 Al-Li Alloy

doi:10.11902/1005.4537.2019.138

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 431-438 DOI: 10.11902/1005.4537.2019.138

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Effect of Process Parameters on Corrosion Resistance of Anodizing Film on 2195 Al-Li Alloy

XIAO Jintao¹,CHEN Yan¹,XING Mingxiu¹,JU Pengfei¹(

),MENG Yingen¹,WANG Fang²

1. Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, China
2. Shanghai Academy of Spaceflight Technology, Shanghai 201109, China

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Abstract

The effect of sulfuric acid concentration, applied voltage and oxidation time on the corrosion resistance of anodizing film of 2195 Al-Li alloy was studied. The surface morphology, thickness and corrosion resistance of the oxide film were characterized by scanning electron microscopy (SEM) and electrochemical workstation. The results show that as the concentration of sulfuric acid increases, the formation rate of the oxide film increases first and then decreases. With the increasing of applied voltage, the oxide film thickness increases in turn, but when the voltage is too high, the phenomenon of "ashing" will occur. As the oxidation time increases, the thickness of the oxide film increases sequentially. When the oxidation time reaches 30 min, the film formation rate increases. The anodizing film presents the best corrosion resistance, when anodizing process was performed with the following parameters: the sulfuric acid concentration is 180~200 g/L, the temperature is 14 ℃, the applied voltage is 14 V and the oxidation time is 50 min.

Key words: anodic oxidation 2195 Al-Li alloy oxide film corrosion resistance

Received: 01 September 2019

Fund: National Natural Science Foundation of China (51771122) and Shanghai Pujiang Program(19PJ1431500)

Corresponding Authors: Pengfei JU E-mail: jupengfei10@163.com

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Cite this article:

XIAO Jintao,CHEN Yan,XING Mingxiu,JU Pengfei,MENG Yingen,WANG Fang. Effect of Process Parameters on Corrosion Resistance of Anodizing Film on 2195 Al-Li Alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 431-438.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.138 OR https://www.jcscp.org/EN/Y2019/V39/I5/431

Fig.1 Surface morphologies of oxide films formed on 2195 Al-Li alloy after anodization in sulfuric acid solutions of 180~200 g/L (a), 230~250 g/L (b) and 270~290 g/L (c)

Fig.2 Thicknesses of oxide films formed on 2195 aluminum-lithium alloy after anodization in sulfuric acid soluti-ons with different concentrations

Fig.3 Surface morphologies of oxide films formed on 2195 Al-Li alloy after anodization at different oxidation voltages: (a) 10 V, (b) 13 V, (c) 16 V, (d) 19 V

Fig.4 Thicknesses of oxide films formed on 2195 Al-Li alloy after anodization at different oxidation voltages

Fig.5 Surface morphologies of oxide films formed on 2195 Al-Li alloy after anodization for different time: (a) 20 min, (b) 30 min, (c) 40 min, (d) 50 min

Table 1 Compositions of anodized film formed on 2195 Al-Li alloy after anodization for different time (mass fraction / %)

Fig.6 Thickness of oxide film of 2195 Al-Li alloy with different oxidation time

Fig.7 Dynamic potential polarization curves of 2195 Al-Li alloy anodized for different oxidation time

Table 2 Electrochemical parameters of 2195 Al-Li alloy anodized for different time

Fig.8 Nyquist diagrams of 2195 Al-Li alloy after anodizat-ion for different time

Fig.9 Bode diagrams of 2195 Al-Li alloy anodized for different time

Fig.10 Equivalent circuit diagram

Table 3 Fitting results of electrochemical elements R_p1, R_p2 and R_b of 2195 Al-Li alloy anodized for different time

Fig.11 Resistances of oxide films formed on 2195 Al-Li alloy after anodization for different time

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