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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (3): 239-244    DOI: 10.11902/1005.4537.2014.078
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Corrosion Behavior of 5083 Al-alloy in Seawater and Its Cathodic Protection
Zaijian LIU1,Jia WANG1,2(),Penghui ZHANG1,Yanhua WANG1,Yuan ZHANG1
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

The corrosion behavior of 5083 Al-alloy in seawater was studied by electrochemical methods, and the influence of Cl- concentration on its pitting behavior was investigated. The results showed that the pitting potential of 5083 Al-alloy in seawater was -690 mV and the corresponding protective potential was -720 mV. Cl- is the main active ion for pitting corrosion of 5083 Al-alloy. For the solutions with the same ion strength but varied Cl- concentration in a range of 0~0.1 mol/kg, the pitting potential decreased quickly with the increasing Cl- concentration. When Cl- concentration exceeded 0.1 mol/kg, the pitting corrosion potential would no longer change obviously. In the meanwhile, the cathodic protection potential for 5083 Al-alloy was validated in a range of -800~-1000 mV by polarization experiment, which provides the basis for its protection while used in seawater.
Key words:  5083 Al-alloy      pitting corrosion      Cl-      cathode protection     
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Zaijian LIU
Jia WANG
Penghui ZHANG
Yanhua WANG
Yuan ZHANG

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Zaijian LIU,Jia WANG,Penghui ZHANG,Yanhua WANG,Yuan ZHANG. Corrosion Behavior of 5083 Al-alloy in Seawater and Its Cathodic Protection. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 239-244.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.078     OR     https://www.jcscp.org/EN/Y2015/V35/I3/239

Fig.1  Schematic diagram of 5083 aluminum alloy electrode
Number V N a 2 S O 4 / mL VNaCl / mL c C l - / molkg-1
1 500 0 0
2 500 0.5 6.20×10-4
3 499 1 1.20×10-3
4 490 10 1.20×10-2
5 400 100 0.12
6 300 200 0.25
7 250 250 0.31
8 200 300 0.37
9 100 400 0.50
10 0 500 0.62
Table 1  Constitutes of mixed solutions with the same ion strength but different chloride ion content
Fig.2  Variation of corrosion potential of 5083 aluminum alloy in seawater with time
Fig.3  Variation of current density with potential for 5083 aluminum alloy in seawater
Fig.4  Variations of current density with potential for 5083 aluminum alloy in different mixed solutions
Fig.5  Variation of pitting potential with Cl- concentration for 5083 aluminum alloy
Fig.6  Variation of current density with potential in the range of -1200~-700 mV
Fig.7  5083 aluminum alloy electrode without immersion
Fig.8  Surface morphologies of 5083 aluminum alloy electrode immersed under different polarization potentials for 2 d (a), 10 d (b) and 19 d (c)
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