THE ELECTROCHEMICAL BEHAVIOR OF DOPED SILANE PRE-TREATMENTS ON GALVANIZED STEEL SUBSTRATES

Qiliang Zhao, Wei Guo, Qingdong Zhong, Junliang Zhang, Jinhu Sun and Hui Li
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Qiliang Zhao: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China
Wei Guo: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China
Qingdong Zhong: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China
Junliang Zhang: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China
Jinhu Sun: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China
Hui Li: State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 02, 1-7

Abstract: In this paper, galvanized steel substrates were pre-treated in γ-(2,3-epoxypropoxy)propyl trimethoxy silane solutions containing salts ((NH4)2TiF6, K2ZrF6 and NaVO3) and SiO2. The surface microstructures of the coated substrates were evaluated by scanning electron microscopy (SEM). The anti-corrosion performance of the modified silane film applied on galvanized steel substrates was evaluated by potentio-dynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS). The electrochemical results reveal that the addition of salts ((NH4)2TiF6, K2ZrF6 and NaVO3) may produce a more stable and protective fluoride combined with their oxides in the silane layer. The results also reveal that the addition of the SiO2 nanoparticles reinforced the barrier properties of the silane films and imparted its corrosion inhibition ability.

Keywords: Silanes; corrosion; salts; EIS; SiO2 nanoparticles (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500159

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