Influence of Typical Anions in Seawater Environments on Corrosion Behaviors of 5083 Aluminum Alloy

doi:10.13208/j.electrochem.160614

Abstract

Abstract: The interaction effects of typical anions, namely, Cl^-, HCO₃^- and SO₄^2-, presented in seawater environments on corrosion resistance behaviors of AA5083 aluminum alloy have been studied. The corrosion resistances of the 5083 aluminum alloy in different simulated seawater environments were tested by factorial analysis method. The polarization curves, the corrosion potentials, corrosion current densities and the breakdown potentials were examined in different concentrations of Cl^-, HCO₃^- and SO₄^2-.The corrosion behavior was analyzed by electrochemical impedance spectroscopy (EIS). The results showed that both Cl^-, and HCO₃^- could accelerate the pitting corrosion. When the concentration of Cl^-, remained constant, the corrosion resistance of AA5083 aluminum alloy increased initially with an increase in the concentration of HCO₃^-,and then dropped dramatically at 70～90 mg•L^-1, which displayed the best corrosion resistance performance. Afterwards, the corrosion resistance increased again. The corrosion current density of AA5083 aluminum alloy was not significantly affected by SO₄^2- when the concentrations of Cl^- and HCO₃^- became larger. Meanwhile, when the concentration of HCO₃^- was fixed, the charge-transfer resistance of AA5083 aluminum alloy at a lower Cl^-concentration was smaller than that at a higher Cl^- concentration, and the corrosive ions could easily penetrate the native oxide film by a redox reaction with the matrix.

Key words: 5083 aluminum alloy, corrosion resistance, electrolyte effect, seawater environment

CLC Number:

O646.6

TU Yang-fan, FENG Li-ming, FANG Zhi-gang,LIU Hai-tao, JING Ming-hua, GUAN Yong. Influence of Typical Anions in Seawater Environments on Corrosion Behaviors of 5083 Aluminum Alloy[J]. Journal of Electrochemistry, 2017, 23(4): 466-472.

References

[1] Ezuber H, El-Houd A, El-Shawesh F. A study on the corrosion behavior of aluminum alloys in

seawater[J]. Materials and Design, 2008, 29: 801-805.

[2] Burstein G T, Liu C, Souto R M. Origins of pitting corrosion[J]. Corrosion Engineering, Science and Technology, 2004, 39(1): 25-30.

[3] Rowland H T, Dexter S C. Effect of sea water carbon dioxide system on the corrosion of aluminum[J]. Corrosion, 1980, 36(9): 458-467.

[4] Lin L Y (林乐耘), Zhao Y H (赵月红). Severe corrosivity and its eletrochemical mechanism of seawater in Xiamen sea area to Al-Mg alloys[J]. Journal of Electrochemistry (电化学), 2003, 9(3): 299-307.

[5] Mu Z J (穆振军),Lin Z J (林志坚),Zhuang Y (庄焱), et al. Corrosion behavior of aluminum-magnesium alloy in sea areas and its electrolyte effect in Xiamen sea area[J]. Development and application of materials (材料开发与应用), 2007, 22(5): 20-24.

[6] Huang G Q (黄桂桥). Corrosion of aluminium alloys in marine environment (Ⅰ)-a summary of 16 years exposure testing in seawater full immersion zone[J]. Corrosion & protection (腐蚀与防护), 2002, 23(1): 18-23

[7] Huang G Q (黄桂桥). Corrosion of aluminium alloys in marine environment (Ⅱ)-a summary of 16 years exposure testing in seawater full immersion zone[J]. Corrosion & protection (腐蚀与防护), 2002, 23(2): 47-50.

[8] Huang G Q (黄桂桥). Corrosion of aluminium alloys in marine environment (Ⅲ)-a summary of 16 years exposure testing in seawater full immersion zone[J]. Corrosion & protection (腐蚀与防护), 2003, 24(2): 47-57.

[9] Box G E P, Hunter J S, Hunter W G. Statistics for experimenters: Design, Innovation, and Discovery, Second Edition[M]. (Zhang R C (张润楚), Liu M Q (刘民千), Yang J F (杨建峰), et al, Trans.). Beijing: China Machine Press, 2009. 105.

[10] Chen K (陈魁). Design and analysis of experiments[M]. Beijing: Tsinghua University Press, 2005. 61.

[11] Kim S J, Jang S K, Kim J I. Investigation on optimum corrosion protection potential of Al alloy in marine environment[J]. Materials Science-Poland, 2008, 26(3): 779-785.

[12] Juttner K. Electrochemical Impedance Spectroscopy (EIS) of corrosion processes on inhomogeneous surface[J], Electrochemical Acta, 1990, 35: 1501.

[13] Peng W C (彭文才), Hou J (侯健), Guo W M (郭为民), et al. Effect of temperature and dissolved oxygen on corrosion performance of alloy 5083 in seawater[J]. Equipment Environment Engineering (装备环境工程), 2010, 7(3): 22-26.

[14] Moreto J A, Marino C E B, Filho W W B. SVET, SKP, and EIS study of the corrosion behaviour of high strength Al and Al-Li alloys used in aircraft fabrication[J]. Corrosion Science, 2014, 84: 31-41.