ON CORROSION RESISTANCE OF CHROMATED PASSIVE FILM ON AMORPHOUS Fe-W DEPOSITS

J Chin Soc Corr Pro

1996, Vol. 16

Issue (2): 122-126 DOI:

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ON CORROSION RESISTANCE OF CHROMATED PASSIVE FILM ON AMORPHOUS Fe-W DEPOSITS

Yao Suwei;Zhao Shuilin;Ren Libin;Guo Hetong(Department of Applied Chemistry; Tianjin University)

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Abstract A decorative passive film containing Cr was obtained by passiVating Fe-W amorphous deposits in a chromate solution. Anodic polarization curves showed that the pitting potential of the passivated Fe-W deposit was high up to 1.78V in 3wt% NaCl solution at 25℃ and that the passiVation treatment improved its corrosion resistance against Cl- attack. The results of AES and XPS analyses revealed that the passive film consisted of two layers. The outer layer was a mixturof Fe(CrO4 ) 3· Cr2 (CrO4 ) 3· Cr2 (Cr2 O7) 3·Fe (OH) 3 /FeOOH· WO3·nH2O and t he inner layer was a mixture of Cr2O3,CrO3 , CrOOH, FeO, Fe2O3and WO3. The thickness of the passive film was about 60nm.

Key words: Fe-W Passive film Corrosion resistance Binding energy

Received: 25 April 1996

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Yao Suwei;Zhao Shuilin;Ren Libin;Guo Hetong(Department of Applied Chemistry; Tianjin University). ON CORROSION RESISTANCE OF CHROMATED PASSIVE FILM ON AMORPHOUS Fe-W DEPOSITS. J Chin Soc Corr Pro, 1996, 16(2): 122-126.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I2/122

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