Surface modification of Ca60Mg15Zn25 bulk metallic glass for slowing down its biodegradation rate in water solution

Three kinds of new barrier films were introduced on the surface of Ca60Mg15Zn25 bulk metallic glasses (BMGs) in order to slow down its biodegradation/corrosion rate, including fluoroalkylsilane (FAS) coating, pure Fe film and (Fe + FAS) bilayer The changes of surface morphology were characterized by scanning electron microscopy (SEM) Contact angle meter was applied to test the surface wettability at ambient temperature. The corrosion rate was investigated by immersion test in deionized water It was found that various micro-nanoscale hierarchical structures could be constructed after different surface treatments. By suitable surface modification strategy, Ca60Mg15Zn25 BMG showed increased water contact angle even up to 133 6 degrees The immersion experiment results showed that Fe film and FAS thin film coatings with hydrophobic and insulative characteristics are beneficial to provide effective anti-corrosive protection to Ca60Mg15Zn25 BMG, with the sequence Fe coating> (Fe + FAS) treated> FAS treated (C) 2010 Elsevier B V All rights reservedhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000278640700016&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Materials Science, MultidisciplinaryPhysics, AppliedSCI(E)12ARTICLE131462-14646