【摘 要】
：
Polymeric drug-eluting coating is wildly used in clinic. However, the corrosion resistance of bulk-eroding polymer coated magnesium is poor, especially for long-term immersion. This is mainly because
【机 构】
：
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, College of Materials Sc
【出 处】
：
第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Polymeric drug-eluting coating is wildly used in clinic. However, the corrosion resistance of bulk-eroding polymer coated magnesium is poor, especially for long-term immersion. This is mainly because the water absorption and acid degradation product of polymers. To address insufficient corrosion control of polymer-coated Magnesium, we applied a hydrophobic stearic acid (SA) thin layer underlying the poly (lactic acid) (PLA) and poly (ε-caprolactone) (PCL) coatings on mg. The SA imbedded polymer-coated Mg showed apparently smaller free corrosion current density than the direct-coated counterparts. More importantly, they exhibited manifestly slower and more stable long-term in vitro immersion degradation than the direct polymer-coated Mg up to 21 days. Moreover, scratch testing disclosed their undercutting corrosion was evidently suppressed. The strengthened corrosion control by the imbedded layer is attributed to its kinetic barrier, hydrophobic nature as well as shielding effect. The SA layer not only block the electrolyte polymer coating absorbed, but also hinder the acid degradation product of polymer coatings to attack substrate.
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