Welcome to Visit Journal of Electrochemistry,Today is Share:

Journal of Electrochemistry ›› 2017, Vol. 23 ›› Issue (4): 466-472.doi: 10.13208/j.electrochem.160614

• Articles • Previous Articles     Next Articles

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

TU Yang-fan1,3, FENG Li-ming1, FANG Zhi-gang2 , LIU Hai-tao3, JING Ming-hua3, GUAN Yong2,3*   

  1. 1. Department of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Naval Academy of Armament, Beijing 100161, China; 3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
  • Received:2016-06-14 Revised:2016-07-20 Online:2017-08-25 Published:2016-08-02
  • Contact: GUAN Yong E-mail:yguan@imr.ac.cn

Abstract: The interaction effects of typical anions, namely, Cl-, HCO3- and SO42-, 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 SO42-.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 SO42- 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: