Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings

doi:10.11902/1005.4537.2013.258

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (1): 86-90 DOI: 10.11902/1005.4537.2013.258

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Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings

ZHAO Xiaohong¹, GUO Quanzhong², DU Keqin²(

), GUO Xinghua², WANG Yong²

1. China FAW Group Corporation R＆D Center, Changchun 130000, China
2. State Key Laboratory for Corrosion and Protection, Institution of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Galvanic corrosion behavior of couples of cold rolled steel SS400 and hot rolled steel ST12 with chrome-free Zn/Al coating or Zn/Ni alloy electroplating was studied in 3.5%NaCl (mass fraction) solution by means of potentiodynamic polarization and galvanic method. The results showed that the couple of SS400 and ST12 with Zn/Ni alloy electroplating exhibited a weaker tendency of galvanic corrosion, a higher open circuit potential and a smaller galvanic current rather than that with chrome-free Zn/Al coating. While the free-corrosion current of Zn/Ni alloy electroplating coating was smaller than that of Zn/Al coating. Therefore, Zn/Ni alloy electroplating is extremely promising coating for the auto-mobile fastener to replace the traditional Zn electroplating.

Key words: galvanic corrosion chrome-free Zn/Al dacromet coating Zn/Ni alloy electroplating polarization curve

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Cite this article:

ZHAO Xiaohong, GUO Quanzhong, DU Keqin, GUO Xinghua, WANG Yong. Galvanic Corrosion Behavior of Couples of Hot Rolled Steel SS400 and Cold Rolled Steel ST12 with Two Coatings. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 86-90.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.258 OR https://www.jcscp.org/EN/Y2015/V35/I1/86

Fig.1 Surface morphologies (a, b) and corresponding element content (c, d) of chrome-free Zn/Al coating (a, c) and Zn/Ni alloy coating (b, d), respectively

Fig.2 Polarization curves of chrome-free Zn/Al coatings (a) and Zn/Ni alloy coatings (b) in 3.5 % NaCl solution

Table 1 Fitting results of potentiodynamic polarization curves

Fig.3 Curves of galvanic potential of the couples of SS400/ST12 with different coatings as immersion time

Fig.4 Curves of galvanic current of the couples of SS400/ST12 with different coatings as immersion time

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