In vitro degradation resistance of glucose and L-cysteine-bioinspired Schiff-base anodic Ca−P coating on AZ31 magnesium alloy  

AZ31镁合金表面葡萄糖和L-半胱氨酸仿生席夫碱阳极钙磷涂层的耐腐蚀性能

作　　者：Xue-mei WANG Xiao-li FAN Mei-qi ZENG Chang-yang LI Lan-yue CUI Xiao-bo CHEN Yu-hong ZOU Zhen-lin WANG Rong-chang ZENG 王雪梅;樊晓丽;曾美琪;李长阳;崔蓝月;陈晓博;邹玉红;王振林;曾荣昌(山东科技大学材料科学与工程学院轻金属腐蚀实验室,青岛266590;School of Engineering,RMIT University,Carlton 3053,VIC,Australia;山东科技大学化学与生物工程学院,青岛266590;重庆理工大学材料科学与工程学院,重庆400054;郑州大学材料科学与工程学院,郑州450002)

机构地区：[1]Corrosion Laboratory for Light Metals,College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]School of Engineering,RMIT University,Carlton 3053,VIC,Australia [3]School of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,China [4]School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China [5]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第5期1485-1500,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52071191);the Open Foundation of Hubei Key Laboratory of Advanced Technology for Automotive Components,China(No.XDQCKF2021006)。

摘　　要：A Schiff base(a compound containing a C=N bond)induced anodic Ca−P coating was prepared on AZ31 Mg alloy in a mixed solution of CaCl_(2) and KH_(2)PO_(4) at 60℃ in the presence of glucose and L-cysteine.The microstructure and chemical composition of the coatings were characterized using FE-SEM,FT-IR,XRD,and XPS.The in vitro degradation resistance of the coated samples was evaluated via potentiodynamic polarization(PDP),electrochemical impedance spectroscopy(EIS),and hydrogen evolution test.The experimental results show that the Ca−PSchiff base coating is composed of CaHPO_(4)(DCPA)and hydroxyapatite(HA),whereas HA is not present in the Ca−P coating.The Ca−P_(Schiff base) coating thickness is about 2 times that of Ca−P coating(Ca−P coating:(9.13±4.20)μm and Ca−P_(Schiff base):(18.13±5.78)μm).The corrosion current density of the Ca−P_(Schiff base) coating is two orders of magnitude lower than that of the Ca−P coating.The formation mechanism of the Ca−P_(Schiff base) is proposed.通过往60℃传统钙磷处理液中添加适量的氨基酸型席夫碱,在镁合金表面于CaCl_(2)和KH_(2)PO_(4)混合溶液中制备席夫碱(含C=N的化合物)诱导的阳极Ca-P涂层。采用FE-SEM、FT-IR、XRD和XPS技术研究涂层的显微组织和化学成分,涂层试样的耐腐蚀性能则通过动电位极化(PDP)、电化学阻抗光谱(EIS)和析氢试验表征。结果表明,Ca-PSchiff base涂层中存在CaHPO_(4)(DCPA)和羟基磷灰石(HA),而Ca-P涂层中没有HA。此外,Ca-PSchiff base涂层厚度(18.13±5.78)μm大约为Ca-P涂层厚度(9.13±4.20)μm的2倍。电化学结果表明,Ca-PSchiff base涂层的腐蚀电流密度比Ca-P涂层降低两个数量级。最后,提出席夫碱作用下Ca-P涂层的形成机理。

关 键 词：magnesium alloy anodic coating corrosion resistance Schiff base biomaterial 

分 类 号：TG174.4[金属学及工艺—金属表面处理]