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Chinese Journal of Materials Research  2014, Vol. 28 Issue (7): 521-527    DOI: 10.11901/1005.3093.2014.123
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Formation and Corrosion Resistance of Titanium Containing Conversion Film on Hot-dip Galvanized Steel
Qiaoyu XU(),Haixia WANG,Rui JIANG
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640
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Qiaoyu XU,Haixia WANG,Rui JIANG. Formation and Corrosion Resistance of Titanium Containing Conversion Film on Hot-dip Galvanized Steel. Chinese Journal of Materials Research, 2014, 28(7): 521-527.

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Abstract  

A Ti containing conversion film on hot-dip galvanized steel was prepared by chemical conversion in titanium sulfate solution. The surface morphology, chemical composition and ingredients of the film were characterized by means of SEM, EDS and XPS. Then the corrosion resistance of the galvanized steel coated with Ti containing conversion film was examined by NSS test, electrochemical polarization and electrochemical impedance spectroscopy (EIS). The results show that the Ti containing conversion film gradually thickens and the Ti content of the film increases with the increasing time in the solution; the film mainly consists of Ti(OH)4/TiO2 and Zn(OH)2/ZnO. In comparison with the blank galvanized steel, the corrosion current density decreases, the polarization resistance and the electrochemical impedance increase significantly for the galvanized steel with Ti containing conversion film on top. The Ti containing conversion films enhance the corrosion resistance significantly, among them a film prepared in the solution for 10 min exhibits the highest corrosion resistance.
Key words:  materials failure and protection      hot-dip galvanizing      conversion film      titanium      corrosion resistance     
Received:  18 March 2014     
Fund: *Supported by the Cooperation of Industry-University-Institute of Ministry of Education and Guangdong Province No. 2012B091100312, and the Fundamental Research Funds for the Central Universities No. 2012ZM0011.
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Qiaoyu XU
Haixia WANG
Rui JIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.123     OR     https://www.cjmr.org/EN/Y2014/V28/I7/521

Fig.1  Surface morphologies of samples treated with Ti(SO4)2 solution for 1 min (a), 10 min (b), 30 min (c) and 60 min (d)
Fig. Treat time/min Micro-site Zn O Ti
Fig.1a 1 surface 88.62 10.69 0.69
Fig.1b 10 surface 79.69 15.84 4.47
Fig.1c 30 surface 71.92 20.36 7.72
Fig.1d 60 surface 64.56 25.23 10.21
Fig.1d 60 crack 85.44 9.50 5.06
Table 1  Chemical composition of different micro-sites corresponding to Fig.1 (mass fraction, %)
Fig.2  XPS spectra of Ti conversion film treated for 10 min
Element Zn O Ti
Atomic fraction, % 12.727 78.020 9.253
Mass fraction, % 32.380 49.544 17.626
Table 2  XPS analysis of surface composition of Ti conversion coating treated for 10 min
Fig.3  XPS spectra of Ti conversion film, (a) Zn2p, (b) Ti2p, (c) O1s
Fig.4  Conditions of corrosion, anti-corrosion passivity of Ti-H2O (a) and Zn-H2O (b) at 25℃
Fig.5  NSS results of HDG and Ti conversion films for different treating time
Fig.6  Polarization curves of HDG and Ti conversion films for different treating time in 5% NaCl solution
Sample Ecorr/V Rp/kΩcm2 Jcorr/μAcm2
HDG -1.095 1.043 9.020
1 min -1.035 4.469 1.434
10 min -1.078 46.90 0.202
30 min -1.099 24.79 0.348
60 min -1.116 5.255 1.639
Table 3  Electrochemical polarization parameters corresponding to Fig.6
Fig.7  EIS of HDG and Ti conversion films for different treating time in 5% NaCl solution, (a) Nyquist, (b) local amplification of Fig.a
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