| GAO Bo,DONG Li-yang,ZHU Guang-lin,GAO Chao,ZHOU Ying-wei.Properties of Bis-silane Chromium-free Passive Film on Hot-dip Galvanized Steel[J],46(6):202-206 |
| Properties of Bis-silane Chromium-free Passive Film on Hot-dip Galvanized Steel |
| Received:January 15, 2017 Revised:June 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.032 |
| KeyWord:hot-dip galvanized steel corrosion resistance silane chromium-free passive film |
| Author | Institution |
| GAO Bo |
School of Metallurgy, Northeastern University, Shenyang , China |
| DONG Li-yang |
School of Metallurgy, Northeastern University, Shenyang , China |
| ZHU Guang-lin |
School of Metallurgy, Northeastern University, Shenyang , China |
| GAO Chao |
School of Metallurgy, Northeastern University, Shenyang , China |
| ZHOU Ying-wei |
School of Metallurgy, Northeastern University, Shenyang , China |
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| Abstract: |
| The work aims to further improve corrosion resistance of chromium-free passive film on hot-dip galvanized steel. With H2TiF6 and NH4VO3 as proper inorganic constituents and styrene-acrylic emulsion as major film-forming material, a layer of corrosive bis-silane chromium-free passive film was obtained on hot-dip galvanized steel by binding the constituents tightly using silicon coupling agent (KH-560, KH-570). Corrosion resistance of the bis-silane chromium-free passive film was characterized by neutral salt spray test, electrochemical test, scanning electron microscopy and Fourier infrared spectroscopy. Corrosion area of the film accounted for approximately 2%~4% after 96 h neutral salt spray test, and corrosion current density was one order of magnitude lower than that of untreated hot-dip galvanized steel, indicating that the bis-silane chromium-free passive film could exhibit excellent corrosion resistance. SEM analysis showed that a nearly 3 μm thick uniform, continuous and compact passive film took shape on the surface of hot-dip galvanized steel. FTIR analysis indicated that —(CH2) n—, C＝O, Si—O, Si—O—Si and Si—O—Zn bonds were present in the passive film. The hot-dip galvanized steel exhibits excellent corrosion resistance and meets requirements of industrial application since a layer of uniform and compact passive film takes shape on the surface of hot-dip galvanized steel. |
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