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Chinese Journal of Materials Research  2016, Vol. 30 Issue (4): 269-276    DOI: 10.11901/1005.3093.2015.435
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Preparation and Corrosion Performance of Lanthanum Nitrate Conversion Coating on Hot-dip Galfan Steel
WU Xiaoxiao, KONG Gang, SUN Ziwen, CHE Chunshan**()
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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WU Xiaoxiao, KONG Gang, SUN Ziwen, CHE Chunshan. Preparation and Corrosion Performance of Lanthanum Nitrate Conversion Coating on Hot-dip Galfan Steel. Chinese Journal of Materials Research, 2016, 30(4): 269-276.

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Abstract  

Lanthanum nitrate conversion coating was prepared on a hot-dip Galfan steel by dipping in a passivation solution of La(NO3)3. The surface morphology, chemical composition and structure of the coating were characterized by scanning electron microscopy (SEM) with X-ray energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM). The corrosion resistance of the conversion film coated steel was assessed by neutral salt spray tests (NSS), electrochemical polarization curve and electrochemical impedance spectroscopy (EIS). The results showed that the conversion coating was not uniform, which had grown preferentially on grain- and phase-boundaries as well as other active sites. The thickness of the coating increased, while cracks in the coating expanded gradually with the increasing dipping-time. The coating spall off after dipping for more than 30 min, and therewith the protective performance of the coating degraded. In comparison with the blank Galfan steel, the corrosion rate of the conversion film coated Galfan steel lowered down significantly.
Key words:  materials failure and protection      hot-dip Galfan      conversion coating      lanthanum salt      growth process      corrosion resistance     
Received:  07 July 2015     
ZTFLH:  TB304  
  TG174.4  
Fund: Supported by the International Lead and Zinc Study Group No.ILZRO/IZA//CN201212, and the Fundamental Reasearch Funds for the Central Universities No.2012ZM0011, and the Guangdong Provincial Research Project of the Ministry of Education No.2012B091100312
About author:  To whom correspondence should be addressed, Tel: (020)85511540, E-mail: wyccs1975@163.com
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Xiaoxiao WU
Gang KONG
Ziwen SUN
Chunshan CHE

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.435     OR     https://www.cjmr.org/EN/Y2016/V30/I4/269

Fig.1  SEM images of Galfan coating treated in lanthanum salt bath for (a) 10 s; (b) 1 min; (c) 10 min; (d) 30 min; (e) 60 min
Analytical area Treatment time Zn Al O La
1 10 s 88.12 11.88 - -
2 1 min 72.01 13.82 13.71 0.46
3 1 min 49.58 12.05 36.22 2.15
4 10 min 49.52 7.71 39.34 3.43
5 10 min 16.04 2.54 68.91 12.50
6 30 min 34.07 1.57 54.07 10.29
7 60 min 8.96 1.07 72.92 17.05
8 60 min 89.05 10.95 - -
Table 1  EDS analysis results for the different micro squares in Fig.1 (%, atomic fraction)
Fig.2  XPS surface analysis of conversion film formed on Galfan coating with 1 min treatment
Fig.3  High resolution XPS spectra of Zn2p (a), La3d (b), Al2p (c), O1s (d)
Fig.4  XPS depth analysis profiles of four elements in Galfan coating with 1 min treatment
Fig.5  AFM micrographs of Lanthanum conversion coating formed after passivation treatment for (a) 10 s; (b) 1 min
Fig.6  NSS results of Galfan coating without and with passivation treatment for different time
Fig.7  Electrochemical polarization curves of Galfan coating without and with Lanthanum conversion treatment for different time in 5% NaCl solution
Sample Ecorr/V Rp/Ωcm2 Icorr/μAcm-2
Galfan -1.062 1546.3 5.430
10 s -1.068 2687.6 3.101
1 min -1.060 3494.0 2.242
10 min -1.041 56690.0 0.1178
30 min -1.052 22930.2 0.3530
60 min -1.077 9441.9 0.8021
Table 2  Electrochemical polarization parameters corresponding to Fig.7
Fig.8  EIS of Galfan coating without and with Lanthanum conversion treatment for different time in 5% NaCl solution, (a) Nyquist plots; (b) local amplification of Fig.8a
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