生物医用MgZn合金表面PDA/HA复合涂层制备及性能  

Preparation and Properties of PDA/HA Composite Coatings on Biomedical MgZn Alloy

作　　者：于迎雪 张倩倩[1] YU Yingxue;ZHANG Qianqian(School of Mechanical Engineering,Dalian University,Dalian 116622)

机构地区：[1]大连大学机械工程学院,大连116622

出　　处：《特种铸造及有色合金》2025年第2期252-256,共5页Special Casting & Nonferrous Alloys

基　　金：辽宁省大学生创新创业计划资助项目(S202211258073);大连大学“学科建设专项——学科交叉资助项目”(DLUXK-2023-QN-011)。

摘　　要：采用水热法在Mg-2Zn-0.5Nd-1Y-0.5Zr镁合金表面制备羟基磷灰石涂层(HA),然后,利用水浴加热法在其表面制备聚多巴胺(PDA)/HA复合涂层。水热处理后获得的HA单膜层组织,表面涂层较稀松,涂层间存在较大的空隙,经PDA涂层预处理得到的PDA/HA复合涂层,表面为均匀的交叉密布的细小片状结构,显示出完整致密的结构。通过浸泡试验计算腐蚀速率,采用OM分析合金的微观组织,探究含涂层稀土镁合金的腐蚀行为和机理,并评价涂层的保护效率。结果表明,PDA/HA复合涂层较单一HA涂层合金展现出了更好的耐腐蚀性,起到了较好的保护作用。在100℃、4 h下制备的PDA/HA复合涂层的试样综合性能最佳,腐蚀电压为0.06382 V,腐蚀电流密度为8.166×10^(−7)A/cm^(2)。The hydroxylapatite coating(HA)was prepared on the surface of magnesium alloy samples by hydrother⁃mal method,and then the polydopamine(PDA)/HA composite coating was prepared on the surface by water bath heating method.After hydrothermal treatment,the surface coating of HA single film presents loose with large gaps.PDA/HA composite coating was prepared by PDA coating pre-treatment,whose surface is a uniform cross-covered with small sheet-like structure,showing a complete dense structure.The corrosion rate was calculated by immersion test,and microstructure of the alloy was analyzed by OM.The corrosion behavior and mechanism of the alloy were investigated to evaluate the protective efficiency of the coating.The results indicate that PDA/HA composite coating exhibits better corrosion resistance than single HA coating alloy,and plays a better protective role.The comprehensive properties of PDA/HA composite coatings prepared at 100℃for 4 h are desirable,where the corrosion voltage is 0.06382 V,and the corrosion current is 8.166×10^(−7)A/cm^(2).

关 键 词：镁合金 PDA/HA复合涂层 耐腐蚀性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]