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Adhesion and corrosion resistance of polycaprolactone coating on NiTi alloy surface after alkali heat pretreatment

Biosurface and Biotribology 2022年第4期8卷 307-314页

作者： Zhihui Zhang Yanan Yang Yunting Guo Pengwei Sha Zezhou Xu Zhenglei Yu Jiashun Si Zhengao Zhang Jia Guo Yifan Chen Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchunChina Weihai Institute for Bionic Jilin UniversityWeihaiChina State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchunChina Beijing Reserarch Institute of Automation for Machinery Industry Co. LtdBeijingChina Key Laboratory of Automobile Materials Ministry of EducationCollege of Materials Science and EngineeringJilin UniversityChangchunChina

Selective laser melting of nickel-titanium alloy(SLM-NiTi)can precisely control the size of the sample molding structure and has attracted extensive attention due to its special superelasticity and shape memory effect.However,the biological inertness and poor corrosion resistance of SLM-NiTi alloy limit their wide application as biomedical implant materials.In this study,polycaprolactone(pcl)coating was prepared on SLM-NiTi alloy by dipping and pulling method,and the effects of alkali heat pretreatment on the morphology,adhesion,corrosion resistance,long-term stability and biomineralisation of the pcl coatings were investigated.The results showed that pcl coating can substan-tially improve the performance of SLM-NiTi alloy,and the pcl coating after alkali heat pretreatment has higher adhesion(increased from 1,747 to 2,498 mN)and lower corrosion current density(reduced by about an order of magnitude compared to pcl coating alone).In addition,the necessary stability,biomineralisation and biocompatibility ability of coatings were also further improved.Therefore,the alkali heat pretreated pcl-coated SLM-NiTi alloy has good application prospects in implants due to its superior properties.

关键词： adhesion alkali heat pretreatment corrosion resistance pcl coating SLM-NiTi alloy

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