Effects of Passivation Treatment on Corrosion Behavior of Al-B<sub>4</sub>C Composites

ZHANG Lulu; KE Lei; BAI Qin; MA Yuntao; XIA Shuang; ZHOU Bangxin

doi:10.11973/fsyfh-202002001

Corrosion & Protection > 2020 > 41(2): 1-6. > DOI: 10.11973/fsyfh-202002001

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): 1-6. DOI: 10.11973/fsyfh-202002001

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Effects of Passivation Treatment on Corrosion Behavior of Al-B₄C Composites

1. Material Research Institute, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Zhenjiang Haicore Equipment Co., Ltd., Zhenjiang 212006, China

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Received Date: June 01, 2019

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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.
- passivation treatment,
- Al-B₄C composite,
- oxide film,
- electrochemical test,
- immersion corrosion

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