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Wednesday, 17 July 2019
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Raw materials & technologies, Technologies

Silane coupling agent pretreatment and polycaprolactone coating for enhanced corrosion resistance for magnesium

Tuesday, 2 July 2019

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 analysed using electrochemical tests (symbol image). Image source: PublicDomainPictures / Pixabay.

The effect of the coating was analysed using electrochemical tests (symbol image). Image source: PublicDomainPictures / Pixabay.

The effect of the coating was analysed using electrochemical tests (potentiodynamic polarisation curves and electrochemical impedance spectroscopy) and immersion tests (hydrogen evaluation tests and scratch tests).

Corrosion resistance extremely improved

The electrochemical tests showed that the corrosion resistance was extremely improved, 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.

The study has been published in Journal of Coatings Technology and Research, Volume 16.

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