Novel PA encapsulated PCL hybrid coating for corrosion inhibition of biodegradable Mg alloys:A triple triggered self-healing response for synergistic multiple protection

作     者：Navdeep Singh Grewal Uma Batra Kamal Kumar Anil Mahapatro 

作者机构：Department of Metallurgical and Materials EngineeringPunjab Engineering CollegeChandigarh 160012India Department of Mechanical EngineeringPunjab Engineering CollegeChandigarh 160012India Department of Biomedical EngineeringWichita State UniversityWichitaKS 67260USA 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第4期

页      面：1440-1460页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Self-healing coating Corrosion resistance Magnesium alloy Phytic acid Polycaprolactone microcapsules 

摘      要：Surface coatings have been extensively used to control the degradation rate of Mg alloys for bioimplant ***,these coatings only act as passive *** corrosive media,structural damage impairs their barrier properties,resulting in rapid degradation of Mg *** present study incorporates phytic acid(PA)as a healing agent in polycaprolactone(PCL)microcapsules with a unique honeycomb core matrix to obtain a self-healing PA-PCLcaps *** contact between simulated body fluid(SBF)and PA-PCLcaps coated ZM21 exhibited Cassie-Baxter interfacial states,resulting in significant hydrophobicity with a contact angle(CA)of *** corrosion potential(Ecorr)and current density(Icorr)were found to be-0.28 V and 1.1×10^(-9)A/cm^(2),respectively,for PA-PCLcaps coating,resulting in biosafe corrosion rate of 2.5×10^(-4)mm/*** mechanical scratching,rapid HA mineralization at scratched regions recovered the hydrogen evolution rate(HER,0.36 mL/cm^(2)/day)and pH change(pH 7.10)of scratched PA-PCLcaps coated ZM21 samples to corresponding unscratched samples within one day of *** coating’s self-healing ability could be attributed to PA released from punctured microcapsules,which facilitates HA *** pH-triggered(pH 10)and Mg(II)-triggered(5 mM)conditions enhanced PA release from PA-PCLcaps coating by 2.5 and 3.1 times,*** a result,dense HA mineralization occurred,which protects the coating from structural defects and ensures its durability in stimulating *** findings of present study provide new insight for design of multiple stimuli-feedback based self-healing coatings on biodegradable Mg alloys.