镁合金表面HA/CNTs涂层的制备及电化学性能研究
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摘要
为了提高生物镁合金羟基磷灰石(HA)涂层的耐蚀性能,在微弧氧化电解液中加入羟基磷灰石/碳纳米管(HA/CNTs)复合粉体添加剂,制备HA/CNTs复合涂层。分别对制备的HA/CNTs复合粉体和HA/CNTs复合涂层进行表面形貌和物相组成分析,并对HA/CNTs复合涂层在模拟体液(SBF)中的耐腐蚀性能进行了研究。结果表明,HA/CNTs复合粉体在微弧氧化过程中能均匀地沉积在镁合金表面,结晶良好且无任何杂质;与HA涂层相比,HA/CNTs涂层具有较小的腐蚀电流密度值和较大的阻抗值。此外,在SBF中浸泡4d后,HA/CNTs复合涂层表面出现大量的亚微米级颗粒产物且没有任何腐蚀裂纹。
In order to improve the corrosion resistance of the hydroxyapatite(HA)coating on biological magnesium alloy,the HA/cabon nanotubes(CNTs)composite coating was prepared by micro arc oxidation(MAO)with an electrolyte,including the composite powders of HA and CNTs.The surface morphologies and the phase compositions of the composite powder were analyzed.In addition,the corrosion resistance of the HA/CNTs composite coating in the simulation body fluid(SBF)was studied.The results show that the composite powders were well deposited on the surface of magnesium alloy during MAO process,and the HA/CNTs composite powder had good crystallinity without any impurities.Compared with HA coating,the HA/CNTs coatings had lower corrosion current density and higher impedance.A large number of sub micron scale particle deposition products were deposited on the HA/CNTs coating surface without corrosion cracks on the surface.
In order to improve the corrosion resistance of the hydroxyapatite(HA)coating on biological magnesium alloy,the HA/cabon nanotubes(CNTs)composite coating was prepared by micro arc oxidation(MAO)with an electrolyte,including the composite powders of HA and CNTs.The surface morphologies and the phase compositions of the composite powder were analyzed.In addition,the corrosion resistance of the HA/CNTs composite coating in the simulation body fluid(SBF)was studied.The results show that the composite powders were well deposited on the surface of magnesium alloy during MAO process,and the HA/CNTs composite powder had good crystallinity without any impurities.Compared with HA coating,the HA/CNTs coatings had lower corrosion current density and higher impedance.A large number of sub micron scale particle deposition products were deposited on the HA/CNTs coating surface without corrosion cracks on the surface.
引文
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[2]张晓,梁敏洁,廖海洪,等.生物医用镁合金腐蚀与防护的研究进展[J].热加工工艺,2014(8):9-12.
[3]Wilke B M,Zhang L,Li W,et al.Corrosion performance of MAO coatings on AZ31 Mg alloy in simulated body fluid vs.Earles Balance Salt Solution[J].Applied Surface Science,2016,363:328-337.
[4]卢志华,孙康宁,赵冬梅,等.羟基磷灰石/碳纳米管复合材料的制备及表征[J].人工晶体学报,2007,36(4):728-731.
[5]Ezhilselvi V,Nithin J,Balaraju J N,et al.The influence of current density on the morphology and corrosion properties of MAO coatings on AZ31B magnesium alloy[J].Surface and Coatings Techno-logy,2016,288:221-229.
[6]Wang Y,Huang Z,Yan Q,et al.Corrosion behaviors and effects of corrosion products of plasma electrolytic oxidation coated AZ31magnesium alloy under the salt spray corrosion test[J].Applied Surface Science,2016,378:435-442.
[7]陈飞,周海,杨英歌,等.镁合金表面处理新技术[J].北京石油化工学院学报,2005,13(4):6-10.
[8]纪美茹,傅小奇,张雷,等.碳纳米管/羟基磷灰石复合材料的制备及表征[J].复合材料学报,2012,29(3):85-89.
[9]李爱民,孙康宁,董维芳,等.烧结工艺对碳纳米管/羟基磷灰石复合材料力学性能与微观结构的影响[J].人工晶体学报,2004,33(4):624-628.
[10]卢志华,孙康宁,孙晓宁,等.碳纳米管的表面改性与羟基磷灰石的包覆[J].无机材料学报,2007,22(6):1127-1130.
[11]Lu X,Feng X,Zuo Y,et al.Evaluation of the microarc oxidation treatment effect on the protective performance of a Mgrich epoxy coating on AZ91D magnesium alloy[J].Surface and Coatings Technology,2015,270:227-235.
[12]Liu C,Liang J,Zhou J,et al.Characterization and corrosion behavior of plasma electrolytic oxidation coated AZ91-T6 magnesium alloy[J].Surface and Coatings Technology,2016,304:179-187.