表面技术2025，Vol.54Issue(16)：100-110,11.DOI:10.16490/j.cnki.issn.1001-3660.2025.16.008
不同轧制态医用Zn-Li-Ce合金表面涂层特征及腐蚀行为研究
Surface Coating Characteristics and Corrosion Properties of Zn-Li-Ce Alloys at Different Rolling States
摘要
Abstract
Zinc-based alloys own good biodegradability,machinability and excellent biological functionality,but the excessive release of Zn2+will cause the local toxicity and affect bone tissue healing,which is difficult to meet the requirements of medical implants.In this study,the novel Zn-Li-Ce zinc alloys were successfully prepared and coated with the zinc strontium phosphate conversion coatings.Besides,the morphology composition,elements distribution,thickness and corrosion resistance were elucidated by OM,SEM/EDS,XRD,3D/CLSM,PDP and EIS.With the increase of the rolling reduction rate(20%,40%,60%and 80%),the surface morphology of coated alloys changed from large mass to small spherical and quadrilateral interwoven growth structure.It could be seen from the element distributions that with the increase of rolling reduction rates,the coverage and uniformity of coating components were improved.The electrochemical corrosion rates(0.669,0.408,0.249 and 0.160 mm/a)and static weight-loss rates(0.052 6,0.031 3,0.017 0 and 0.012 1 mm/a)of coated zinc alloys measured in simulated body fluids showed a gradual decreasing trend.Therein,the best excellent corrosion resistance of coated zinc alloys were obtained at the rolled-reduction of 80%.In the case of large deformation,the small angle grain boundary and the coexisting crystal boundary hindered the pit progress by changing the crystal orientation,thereby enhancing the corrosion resistance of the substrate.In addition,the hot-rolled Zn alloys owned high grain boundary densities,which induced the Zn2+more efficiently to penetrate into the exposed surface through the grain boundaries during the chemical transformation process.The formation of a large number of activated particles was conducive to the formation of uniform and dense zinc-strontium phosphate coating on the surface,which effectively prevented the direct contact between the aggressive ions and the substrate,thereby enhancing the corrosion resistance of the alloy.In the early stage of corrosion,the protective effect of the coating could prevent the surface of the zinc alloy substrate from directly contacting the corrosion solution.With the prolongation of the corrosion process,the film layer of corrosion products was ultimately formed on the surface of the alloy,which effectively reduced the degradation rate of the zinc alloy.In the middle and late stages of corrosion,the degree of protection provided was also different due to the different adhesion between the coating and the substrate.Particularly,the coated zinc alloy with the large rolling pressure rate had the strong binding force and the good coating thickness and density,which could better protect the substrate from erosion,resulting in a uniform corrosion plane.Compared with traditional zinc alloys,the hot-rolled zinc alloys with zinc strontium phosphate conversion coatings have better corrosion resistance and controllable corrosion rates.The results obtained are of great significance for the research on the corrosion resistance of medical zinc alloys,and the zinc strontium phosphate coating coupled with hot-rolled may be an effective measure to decrease the corrosion rates of Zn-Li-Ce alloys,providing a promising way for the surface modification of degradable metals.关键词
医用Zn-Li-Ce合金/轧制压下率/化学转化/降解速率/腐蚀行为Key words
medical zinc alloy/rolling reduction rate/chemical conversion/degradation rate/corrosion behavior分类
矿业与冶金引用本文复制引用
张源,牛丽静,张朋,刘芸,王子剑,田亚强,陈连生..不同轧制态医用Zn-Li-Ce合金表面涂层特征及腐蚀行为研究[J].表面技术,2025,54(16):100-110,11.基金项目
中央引导地方科技发展资金项目(226Z1004G) （226Z1004G）
河北省自然科学基金(E2024209059) （E2024209059）
华北理工大学医工融合项目(ZD-YG-202427) （ZD-YG-202427）
河北省省属高校基本科研业务费(JJC2024080)Central Guiding Local Science and Technology Development Fund Project(226Z1004G) （JJC2024080）
Natural Science Foundation of Hebei Province(E2024209059) （E2024209059）
Key Project of Medicine and Engineering Integration of North China University of Science and Technology(ZD-YG-202427) （ZD-YG-202427）
Basic Research Expenses of Provincial Colleges and Universities(JJC2024080) （JJC2024080）
