富镁涂层对LY12铝合金点蚀的抑制作用
Inhibiting Effect of Mg-Rich Coating on Pitting Corrosion of LY12 Aluminum Alloy
摘 要
通过动电位极化使LY12铝合金表面产生点蚀后分别涂刷富镁涂层和环氧涂层，利用电化学阻抗等方法研究了富镁涂层对于铝合金基体点蚀的作用。结果表明：富镁涂层使铝合金的开路电位发生明显的负移，并在较长时间保持稳定，基体发生腐蚀的时间显著延迟，说明富镁涂层对于铝合金具有明显的阴极保护作用；点蚀的存在使得富镁涂层中的镁粉溶解速率加快，能更有效地保护基体；富镁涂层试样的铝合金基体浸泡后点蚀无明显的发展，说明富镁涂层能够一定程度上抑制铝合金表面点蚀的生成及发展。
富镁涂层
点蚀
阴极保护
aluminum alloy
Mg-rich coating
pitting corrosion
cathodic protection
Abstract
Mg-rich coating and epoxy coating were painted respectively on the surface of LY12 aluminum alloy with pits prepared through potentiodynamic polarization. The effect of Mg-rich coating on pitting corrosion of aluminum alloy substrate was studied with electrochemical impedance spectroscopy (EIS). Results show that the Mg-rich coating could make the open circuit potential of aluminum alloy move negatively and maintained it stable for an extended period, showing good cathodic protection for aluminum alloy. The time for corrosion of the Al substrate was significantly prolonged. On the Al substrate with pits the dissolution rate of Mg particles in the coating increased, which would protect the substrate more effectively. The pits on the substrate surface showed no obvious changes for the Mg-rich coated sample, indicating that the Mg-rich coating could inhibit the generation and development of pitting corrosion on the aluminum alloy to some extent.
中图分类号 DOI 10.11973/fsyfh-201608009
所属栏目 试验研究
基金项目
收稿日期 2015/5/11
修改稿日期
网络出版日期
作者单位点击查看
备注左 禹(1952-),教授,博士,从事材料腐蚀机理与保护技术的相关工作
引用该论文: LIU Bing-yang,ZUO Yu,ZHAO Xu-hui,TANG Yu-ming. Inhibiting Effect of Mg-Rich Coating on Pitting Corrosion of LY12 Aluminum Alloy[J]. Corrosion & Protection, 2016, 37(8): 648
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参考文献
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【3】BATTOCCHI D，SIMES A M，TALLMAN D E，et al. Elechemical behavior of a Mg-rich primer in the protection of Al alloys[J]. Corrosion Science，2006，48(5)：1292-1306.
【4】SIMES A M，BATTOCCHI D，TALLMAN D E. SVET and SECM imaging of cathodic protection of aluminium by a Mg-rich coating[J]. Corrosion Science，2007，49(10)：3838-3849.
【5】BIERWAGEN G，BATTOCCHI D，SIMIES A M，et al. The use of multiple electrochemical techniques to characterize Mg-rich primers for Al alloys[J]. Progress in Organic Coatings，2007，59：172-178.
【6】BIERWAGEN G，BATTOCCHI D，SIMIES A M，et al. Assessment of the corrosion protection of aluminium substrates by a Mg-rich primer:EIS,SVET and SECM study[J]. Progress in Organic Coatings，2008，53：260-266.
【7】BIERWAGEN G，BROWN R，BATTOCCHI D，et al. Active metal-based corrosion protective coating systems for aircraft requiring no-chromate pretreatment[J]. Progress in Organic Coatings，2010，68：48-61.
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【12】WANG Jian-guo，ZUO Yu，TANG Yu-ming. Phosphatizing of Mg particles to improve the protective performance of Mg-rich primer on A2024 Al alloy[J]. Applied Surface Science，2014，292：93-99.
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