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Zhang X.-M.,Northeastern University China | Liu C.-M.,Northeastern University China | Yin Y.-J.,Shenyang Hangda Technology Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2010

Taking a modified silicone resin as bonding agent, water-based chromium-free zinc-aluminum coating was prepared by spaying at room temperature (25°C), natural drying. Surface morphology and corrosion resistance of the coating were examined by LEXTTMOLS3000 laser scanning confocal microscope, scanning electron microscope/energy dispersive spectrum, salt spray test and electrochemical merriments. The results showed that the coating is uniform, dense, and has no obvious micro-cracks. The elements of coating are mainly Zn, Al, Si, C and O, but there is no Cr. The coating shows a good corrosion resistance in salt solution. Source


Zhang X.-M.,Northeastern University China | Huang L.-J.,Northeastern University China | Ying Y.-J.,Shenyang Hangda Technology Co. | Liu C.-M.,Northeastern University China
Advanced Materials Research | Year: 2011

Silane treatment has been applied as a chromium free multi-metal surface treatment for its characteristics of corrosion protection. Silane film curing process is one of the most important variables, the effect of curing temperature and time on the corrosion resistance of vinyltriethoxysilane (VTES) film was studied combined with electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The results showed that the curing temperature and time affect condensation of silanol groups Si-OH in silane films and forming intermediate layer at the silane film/substrate interface, and as a consequence influences the corrosion resistance of VTES films. Source


Zhang X.M.,Northeastern University China | Wang J.J.,Shenyang Hangda Technology Co. | Liu C.M.,Shenyang Hangda Technology Co. | Ying Y.J.,Shenyang Hangda Technology Co.
Applied Mechanics and Materials | Year: 2011

Silane treatment has been applied as a chromium free multi-metal surface treatment for its characteristics of corrosion protection, adhesion promotion and metal surface passivation. Vinyltriethoxysilane(VTES) hydrolysis solutions with the concentration of 4% and 10% were prepared, respectively. Morphologies and microstructures of the VTES films both before and after the corrosion test were observed with a scanning electron microscope (SEM), and effect of cure temperature on the corrosion resistance of silane film was studied combined with electrochemical impedance spectroscopy (EIS). The results showed that the cure temperature affects condensation states of silanol groups -Si -OH in silane films and promotes the forming of -Si-O-Si- network structure, and as a consequence influences the corrosion resistance of VTES films. © Trans Tech Publications. Source


Zhang X.-M.,Northeastern University China | Liu C.-M.,Northeastern University China | Huang L.-J.,Northeastern University China | Yin Y.-J.,Shenyang Hangda Technology Co. | Han C.-Z.,Shenyang Hangda Technology Co.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Electrochemical behavior of hot dip galvanised (HDG) steel surfaces coated with vinyltriethoxysilane (VTES) film was studied by means of open circuit potential, electrochemical impedance spectroscopy and potentiodynamic polarization. The results show that the impedance values of steel sheets coated with the VTES film increases by more than two orders of magnitude and the corrosion current density decreases by more than one order of magnitude when compared with the blank HDG steel sheets during immersion in 3.5% NaCl solution. The VTES film provides good corrosion protection for hot dip galvanised steel. Source


Zhang X.-M.,Northeastern University China | Wang J.-J.,Northeastern University China | Liu C.-M.,Northeastern University China | Yin Y.-J.,Shenyang Hangda Technology Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

The vinyltriethoxysilane films on the surfaces of Q235 steel were prepared by hydrolysis of silane solution. The corrosion resistance of hydrolyzing vinyltriethoxysilane films prepared for different immersion time in the aqueous solution of 3.5%NaCl was investigated by the electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization. The results showed that the vinyltriethoxysilane films prepared with the silane solution hydrolyzed for 8 days on the surfaces of Q235 steel has the optimal corrosion resistance because the anode and cathode reactions are restrained during the corrosion. The corrosion current density of the Q235 steel coated with the vinyltriethoxysilane films is decreased by almost three orders of magnitude and the polarization resistance R p is increased by about two orders of magnitude as well as its low-frequency impedance is increased by more than three orders of magnitude compared with those of the blank Q235 steel sheets without hydrolyzing vinyltriethoxysilane film. Source

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