Passive Film Formed from CrO3-H3PO4-SiO2 Systems on Galvanized Steel Sheet

Lu Yanping; Ren Yuling; Wu Jixun

doi:10.13374/j.issn1001-053x.1997.04.030

Volume 19 Issue 4

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Article Navigation > Chinese Journal of Engineering > 1997 > 19(4): 355-359

Lu Yanping, Ren Yuling, Wu Jixun. Passive Film Formed from CrO3-H3PO4-SiO2 Systems on Galvanized Steel Sheet[J]. Chinese Journal of Engineering, 1997, 19(4): 355-359. doi: 10.13374/j.issn1001-053x.1997.04.030

Citation:

Lu Yanping, Ren Yuling, Wu Jixun. Passive Film Formed from CrO₃-H₃PO₄-SiO₂ Systems on Galvanized Steel Sheet[J]. Chinese Journal of Engineering, 1997, 19(4): 355-359. doi: 10.13374/j.issn1001-053x.1997.04.030

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Passive Film Formed from CrO₃-H₃PO₄-SiO₂ Systems on Galvanized Steel Sheet

doi: 10.13374/j.issn1001-053x.1997.04.030

1. Material Science and Engineering School, UST Beijing, Beijing 100083, China;
2. Baoshan Iron and Steel Corporation, Shanghai, 201900

Received Date: 1996-11-18
Available Online: 2021-09-04

Abstract

Abstract

The composition and structure of passive film formed from CrO₃-H₃PO₄SiO₂, systems on galvanized steel sheet were inveshgated, the corrosion resistance and its protective causes of the film were also discussed. The experimental results showed thatthe film is a thick type of complex conversion coating with gelatinous net structure containing CrO₃, Cr(OH)₃, CrOOH, ZnCrO₄, ZnSiO₃, Zn₃(PO₃)₂, CrPO₄ and SiO₂, etc. The white rust-resisting property of the film is of three times better than that of film formed from CrO₃-SiO₂, systems because of good shielding and inhibiting.
- galvanized steel sheet,
- chromate,
- conversion coating,
- corrosion