Effects of Passivation Treatment on Corrosion Behavior of Al-B4C Composites
摘 要
采用三乙醇胺溶液对Al-B4C复合材料进行了表面钝化处理,通过电化学试验和浸泡腐蚀试验研究了钝化处理对Al-B4C复合材料腐蚀行为的影响。结果表明:钝化处理使Al-B4C复合材料表面生成双层结构的氧化膜,非晶内层氧化膜厚度约为2.5 μm,外层氧化膜由三斜相和单斜相的Al(OH)3构成,厚度小于1 μm;钝化处理后的Al-B4C复合材料具有较大的极化电阻,表现出较好的耐腐蚀性能;经40℃硼酸溶液浸泡腐蚀1 000 h后,钝化Al-B4C复合材料的腐蚀质量增加和金属离子溶出显著低于未钝化Al-B4C复合材料的,说明钝化处理形成的氧化膜,能有效地提高Al-B4C复合材料的耐腐蚀性能。
Abstract
Passivation treatment was conducted on the surfaces of Al-B4C composites by triethanolamine solution. The effects of passivation treatment on the corrosion behavior of the Al-B4C composite were investigated through electrichemical test and immersion corrosion test. The results show that the passivation treatment made a duplex-layer oxide film form on the surface of Al-B4C composite. The oxide film consisted of a continuous amorphous inner layer in a thickness of about 2.5 μm and an outer layer containing triclinic and monoclinic Al(OH)3 in a thickness less than 1 μm. The passivated Al-B4C composite had a large polarization resistance and showed good corrosion resistance. After 1 000 hours of corrosion immersion in boric acid solution at 40℃, the weight-increase after corrosion and metal ion dissolution for the passivated Al-B4C composite were significantly lower than those for the unpassivated Al-B4C composite, which indicated that the oxide film forming during passivation treatment could increase the corrosion resistance of the Al-B4C composite.
中图分类号 TG174 DOI 10.11973/fsyfh-202002001
所属栏目 试验研究
基金项目 国家自然科学基金(51671122;51871144)
收稿日期 2019/6/2
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引用该论文: ZHANG Lulu,KE Lei,BAI Qin,MA Yuntao,XIA Shuang,ZHOU Bangxin. Effects of Passivation Treatment on Corrosion Behavior of Al-B4C Composites[J]. Corrosion & Protection, 2020, 41(2): 1
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【13】朱祖芳. 铝合金表面处理膜层性能及测试[M]. 北京:化学工业出版社, 2012.
【14】生海, 董超芳, 肖葵, 等. pH值对2024-T351铝合金在NaCl溶液中电化学行为的影响[J]. 腐蚀与防护, 2013, 34(2):107-110, 132.
【15】朱祖芳. 铝合金阳极氧化与表面处理技术[M]. 2版. 北京:化学工业出版社, 2010.
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