基于电化学噪声研究缓蚀剂对AA6063铝合金点蚀的影响

引用本文: 阮红梅, 董泽华, 石维, 陈东初. 基于电化学噪声研究缓蚀剂对AA6063铝合金点蚀的影响[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201206251 shu

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

基于电化学噪声研究缓蚀剂对AA6063铝合金点蚀的影响

基金项目:
教育部科学技术研究重点项目(211129)资助 (211129)

摘要:

采用电化学噪声(ECN)、电化学阻抗谱(EIS)和极化曲线研究了AA6063 铝合金在3% (w) NaCl 溶液中的亚稳态点蚀萌发和稳态点蚀生长特征, 着重探讨了CeCl₃、Na₂CrO₄、8-羟基喹啉(8-HQ)等三种不同类型缓蚀剂对亚稳态和稳态点蚀的抑制机理. 结果表明: 当铝合金表面阴极相(Al-Si-Fe)周边的Al 基体发生局部溶解后,会导致邻近区域pH值升高(>8.4), 引起Ce(OH)₃在蚀点中心区的阴极相表面优先沉积, 从而抑制局部腐蚀的阴极去极化过程. 随着缓蚀剂浓度的提高, 亚稳态噪声峰的平均积分电量(q)随之递减, 但噪声峰的平均寿命几乎没有变化, 表明Ce³⁺并不能直接加速亚稳态蚀点的修复, 但可降低蚀点内金属Al 的溶解速率. CrO₄^2-不但可加速蚀点修复, 还可降低亚稳态蚀点的形核速率. 8-HQ主要与Al³⁺、Mg²⁺等形成不溶性螯合物并沉积在铝合金表面,提高了铝基体的全面抗腐蚀能力, 但并不能显著提高其耐点蚀能力.

关键词:

English

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: 07 May 2012
Available Online: 02 August 2012
Fund Project:
教育部科学技术研究重点项目(211129)资助

Abstract:

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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

基于电化学噪声研究缓蚀剂对AA6063铝合金点蚀的影响

English

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

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

基于电化学噪声研究缓蚀剂对AA6063铝合金点蚀的影响

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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