Journal of Coatings Technology and Research

, Volume 16, Issue 1, pp 125–133 | Cite as

Silane coupling agent (SCA) pretreatment and polycaprolactone (PCL) coating for enhanced corrosion resistance for magnesium

  • Jialin Niu
  • Huiyin Liu
  • Xin Ping
  • Xianchao Xun
  • Guangyu LiEmail author


To address the problem of rapid corrosion of magnesium (Mg) alloys, a biodegradable polymer film of polycaprolactone (PCL) with KH550 as silane coupling agent (SCA) was coated on Mg substrate. The effect of the coating was analyzed using electrochemical tests (potentiodynamic polarization curves and electrochemical impedance spectroscopy) and immersion tests (hydrogen evaluation tests and scratch tests). The electrochemical tests showed that the corrosion resistance was extremely improved (by nearly two orders for icorr and 1.04 V for Ecorr), and the immersion tests illustrated that the connection between PCL and Mg substrate was enhanced as well (especially in scratch tests), thus indicating significant improvement of the corrosion resistance of SCA-pretreated PCL polymer samples. In summary, SCA-pretreated PCL is a promising coating to decrease the degradation behavior of Mg substrate.


Magnesium Biodegradability Corrosion resistance Polycaprolactone Silane coupling agent 



This work was supported by the China National Nature Science Foundations (Grant Nos. 31070841 and 51705195) and China Postdoctoral Science Foundation (Grant No. 801161082418).


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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  1. 1.Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchunPeople’s Republic of China
  2. 2.Basic DepartmentAviation University of Air ForceChangchunPeople’s Republic of China

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