Citation: RUAN Hong-Mei, DONG Ze-Hua, SHI Wei, CHEN Dong-Chu. Effect of Inhibitors on Pitting Corrosion of AA6063 Aluminium Alloy Based on Electrochemical Noise[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201206251 shu

Effect of Inhibitors on Pitting Corrosion of AA6063 Aluminium Alloy Based on Electrochemical Noise

1.
1. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China;
2. Department of Chemistry and Chemical Engineering, Foshan University, Foshan 528000, Guangdong Province, P. R. China

Received Date: 7 May 2012
Available Online: 25 June 2012
Fund Project: 教育部科学技术研究重点项目(211129)资助 (211129)

The pitting corrosion of AA6063 aluminum alloy in 3% (w) NaCl solution was investigated by electrochemical noise (ECN), electrochemical impedance spectroscopy (EIS), and polarization curves. Inhibition of nucleation and propagation of metastable pits by inhibitors, such as CeCl₃, Na₂CrO₄, and 8-hydroxyquinoline (8-HQ), was evaluated based on ECN data statistics. It was found that the local pH could be over 8.4 near the cathode phase (Al-Si-Fe) due to dissolution of Al matrix, leading to preferential deposition of Ce(OH)₃ on the surface of the cathode phase, thereby inhibiting the cathodic process of pitting corrosion. The average electric charge (q) of metastable pits decreased with increasing the corrosion inhibitor concentration, but the average lifespan of noise transients remained almost constant, indicating that Ce³⁺ ions did not accelerate the rehabilitation of metastable pits directly, but reduced the dissolution rate of Al inside active pits. However, CrO₄^2- ions not only accelerated the rehabilitation of metastable pits, but also reduced the nucleation rate of the AA6063 aluminum alloy. In contrast, 8-HQ acted as an effective corrosion inhibitor for AA6063 aluminum alloy through formation of insoluble chelate films with Al³⁺ ions and Mg²⁺ ions, but failed to enhance the pitting corrosion resistance of the aluminum alloy.
- Aluminium alloy,
- Electrochemical noise,
- Pitting corrosion,
- Inhibitor,
- Nucleation rate
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