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Cerium-tannic acid passivation treatment on galvanized steel

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Abstract

A novel cerium-tannic acid passivation treatment was performed on galvanized steel. The corrosion resistance of cerium-tannic passivated samples was tested by dropping test with 0.5 wt.% CuSO4 aqueous solution. The mass loss per unit area of passivated samples was measured after the corrosion in 0.5 mol/L NaCl + 0.005 mol/L H2SO4 at room temperature for 96 h. The electrochemical behaviors of cerium, tannic acid, and cerium-tannic acid passivated samples on galvanized steel in 0.5 mol/L NaCl solution were investigated by polarization curves and electrochemical impendence spectra. The corrosion equivalent circuit was established according to the impedance characteristics. The results show that cerium-tannic acid treated samples exhibit better corrosion resistance than the sole cerium or tannic acid treated samples under the same condition. The mechanism of synergistic effect for cerium-tannic acid passivation on galvanized steel was discussed.

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Authors and Affiliations

  1. Ministry of Education of China, Key Laboratory of Nondestructive Testing (Nanchang Hangkong University), Nanchang, 330063, China

    Guangming Liu, Liu Yang, Jihong Tian & Nan Du

  2. School of Aeronautic and Mechanical Engineering, Nanchang Hangkong University, Nanchang, 330063, China

    Fei Yu

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  1. Guangming Liu
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  2. Fei Yu
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  3. Liu Yang
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  4. Jihong Tian
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  5. Nan Du
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Correspondence to Guangming Liu.

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Liu, G., Yu, F., Yang, L. et al. Cerium-tannic acid passivation treatment on galvanized steel. Rare Metals 28, 284–288 (2009). https://doi.org/10.1007/s12598-009-0056-9

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  • DOI: https://doi.org/10.1007/s12598-009-0056-9

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