通过恒电位极化、电化学阻抗(EIS)和动电位扫描曲线,跟踪监测了TA2纯Ti在人工海水溶液中的电化学钝化与特定电位的活化过程,研究了不同海水成分对该过程的影响。结果表明,在1.6 V (SCE)附近出现电流峰,有一定的活化过程。结合SEM和析氧...通过恒电位极化、电化学阻抗(EIS)和动电位扫描曲线,跟踪监测了TA2纯Ti在人工海水溶液中的电化学钝化与特定电位的活化过程,研究了不同海水成分对该过程的影响。结果表明,在1.6 V (SCE)附近出现电流峰,有一定的活化过程。结合SEM和析氧监测结果对电流峰进行了分析,显示1.4～1.6 V (SCE)电位范围内形成的膜层会出现明显缺陷,并且TA2表面没有气泡冒出。Mott-Schottky拟合结果显示,在出现电流峰的电位区间,钛表面膜的半导体性质发生了转变。展开更多
The microstructure, physical and mechanical, and chemical properties of micro-arc calcium phosphate （CAP） coatings deposited under different process voltages in the range of 150-400 V on the commercially pure titani...The microstructure, physical and mechanical, and chemical properties of micro-arc calcium phosphate （CAP） coatings deposited under different process voltages in the range of 150-400 V on the commercially pure titanium （Ti） and Ti-40%Nb （Ti-40Nb） （mass fraction） alloy were investigated by the SEM, TEM, XRD and EDX methods. The coating thickness, roughness, and sizes of structural elements were measured and showed similar linear character depending on the process voltage for the coatings on both substrates. SEM results showed the porous morphology with spherical shape structural elements and rough surface relief of the coatings. XRD and TEM studies exhibited the amorphous structure of the CaP coating. With increasing the process voltage to 300-400 V, the crystalline phases, such as CaHPO4 and β-Ca2P207, were formed onto the coatings. The annealing leads to the formation of complex poly-phase structure with crystalline phases： CaTi4（PO4）6, β-Ca2P2O7, TiP2O7, TiNb（PO4）3, TiO2, NbO2, and Nb2O5. The applied voltage and process duration in the ranges of 200-250 V and 5-10 min, respectively, revealed the coating formed on Ti and Ti-40Nb with optimal properties： thickness of 40-70μm, porosity of 20%-25%, roughness （Ra） of 2.5-5.0 μm, adhesion strength of 15-30 MPa, and Ca/P mole ratio of 0.5-0.7.展开更多
文摘通过恒电位极化、电化学阻抗(EIS)和动电位扫描曲线,跟踪监测了TA2纯Ti在人工海水溶液中的电化学钝化与特定电位的活化过程,研究了不同海水成分对该过程的影响。结果表明,在1.6 V (SCE)附近出现电流峰,有一定的活化过程。结合SEM和析氧监测结果对电流峰进行了分析,显示1.4～1.6 V (SCE)电位范围内形成的膜层会出现明显缺陷,并且TA2表面没有气泡冒出。Mott-Schottky拟合结果显示,在出现电流峰的电位区间,钛表面膜的半导体性质发生了转变。
基金Project(III.23.2.5)supported by the Fundamental Research Program of the Siberian Branch of Russian Academy of SciencesProject(15-03-07659)supported by the Russian Foundation for Basic Research+1 种基金Project(CR16-22)supported by the China and Russia on the Implementation of Inter-governmental ScientificTechnological Cooperation Projects of the Notice(NSC foreign word[2012]No.269)
文摘The microstructure, physical and mechanical, and chemical properties of micro-arc calcium phosphate （CAP） coatings deposited under different process voltages in the range of 150-400 V on the commercially pure titanium （Ti） and Ti-40%Nb （Ti-40Nb） （mass fraction） alloy were investigated by the SEM, TEM, XRD and EDX methods. The coating thickness, roughness, and sizes of structural elements were measured and showed similar linear character depending on the process voltage for the coatings on both substrates. SEM results showed the porous morphology with spherical shape structural elements and rough surface relief of the coatings. XRD and TEM studies exhibited the amorphous structure of the CaP coating. With increasing the process voltage to 300-400 V, the crystalline phases, such as CaHPO4 and β-Ca2P207, were formed onto the coatings. The annealing leads to the formation of complex poly-phase structure with crystalline phases： CaTi4（PO4）6, β-Ca2P2O7, TiP2O7, TiNb（PO4）3, TiO2, NbO2, and Nb2O5. The applied voltage and process duration in the ranges of 200-250 V and 5-10 min, respectively, revealed the coating formed on Ti and Ti-40Nb with optimal properties： thickness of 40-70μm, porosity of 20%-25%, roughness （Ra） of 2.5-5.0 μm, adhesion strength of 15-30 MPa, and Ca/P mole ratio of 0.5-0.7.
