International. By pretreatment with silane coupling agent and polycaprolactone coating, scientists from Jilin University and Air Force University in China obtained increased corrosion resistance for magnesium alloys.
To address the problem of rapid corrosion of this metal, a magnesium substrate was coated with a biodegradable polymer film of polycaprolactone (PCL) with KH550 as the silane coupling agent (SCA). Its effect was analyzed by electrochemical tests (potentiodynamic polarization curves and electrochemical impedance spectroscopy) and immersion tests (hydrogen evaluation tests and scratch tests).
As a result, electrochemical tests showed that corrosion resistance in pretreated samples improved greatly, while immersion tests showed that the connection between PCL and the magnesium substrate also improved, especially during scratching tests.
In summary, PCL pretreated with SCA is a promising coating for decreasing the degradation behavior of magnesium substrates.
Source: Journal of Coatings Technology and Research.
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