Anodizing is always used as an effective surface modification method to improve the corrosion resistance and wear resistance of titanium alloy.The sodium tartrate anodizing is a new kind of environmental anodizing met...Anodizing is always used as an effective surface modification method to improve the corrosion resistance and wear resistance of titanium alloy.The sodium tartrate anodizing is a new kind of environmental anodizing method.In this work, the effects of sodium tartrate anodizing on mechanical property were studied.The oxide film was performed on the TA15 titanium alloy using sodium tartrate as the film former.The effects of this anodizing and the traditional acid anodizing on the fatigue life of TA15 alloy were compared.The results show that the sodium tartrate anodizing just caused a slight increase of hydrogen content in the alloy, and had a slight effect on the fatigue life.While, the traditional acid anodizing caused a significant increase of hydrogen content in the substrate and reduced the fatigue life of the alloy significantly.展开更多
An ionic conductivity prediction equation at low concentration for two acid salts is proposed taking into account the dissociation and association equilibria among ions. The salts considered are sodium and potassium h...An ionic conductivity prediction equation at low concentration for two acid salts is proposed taking into account the dissociation and association equilibria among ions. The salts considered are sodium and potassium hydrogen tartrates. There is no additional parameter of high order terms except for the Onsager's coefficient of limited term in the new equation. Results show a complex conductance of acidic tartrates in aqueous solution. The molar conductivities of metal ions are nearly constant such that the contributions from hydrogen and tartrate ions decrease with concentration, while the molar conductivity of bitartrate ion increases with concentration.展开更多
This study investigated the morphology, structure and tribological properties of the three samples produced by anodic oxidation of Ti10 V2 Fe3 Al in a sulfuric/phosphoric acid electrolyte(SPA), a near-neutral sodium t...This study investigated the morphology, structure and tribological properties of the three samples produced by anodic oxidation of Ti10 V2 Fe3 Al in a sulfuric/phosphoric acid electrolyte(SPA), a near-neutral sodium tartrate electrolyte without nanoparticles(STA) and a nearneutral sodium tartrate electrolyte with polytetrafluoroethylene(PTFE) nanoparticles(CA) in suspension. The STA film had a surface full of bulges and cracks, the SPA film was porous, and the CA film was nanoporous. The SPA film was mainly composed of anatase TiO2, whereas the STA and CA films were mainly amorphous TiO2 with little anatase. The tribological tests indicated that the SPA sample had a lower wear resistance than the titanium alloy substrate, which was attributed to the shedding of abrasive debris, leading to rapid wear. Both STA and CA samples exhibited much lower wear rates than the titanium alloy substrate, and CA sample displayed the lowest wear rate attributed to the formation of a lubricating layer by PTFE nanoparticles. The wear mechanisms are proposed.展开更多
基金financial support from the National Natural Science Foundation of China (No.51171011)
文摘Anodizing is always used as an effective surface modification method to improve the corrosion resistance and wear resistance of titanium alloy.The sodium tartrate anodizing is a new kind of environmental anodizing method.In this work, the effects of sodium tartrate anodizing on mechanical property were studied.The oxide film was performed on the TA15 titanium alloy using sodium tartrate as the film former.The effects of this anodizing and the traditional acid anodizing on the fatigue life of TA15 alloy were compared.The results show that the sodium tartrate anodizing just caused a slight increase of hydrogen content in the alloy, and had a slight effect on the fatigue life.While, the traditional acid anodizing caused a significant increase of hydrogen content in the substrate and reduced the fatigue life of the alloy significantly.
基金Supported by the National Natural Science Foundation of China(No.29736170)
文摘An ionic conductivity prediction equation at low concentration for two acid salts is proposed taking into account the dissociation and association equilibria among ions. The salts considered are sodium and potassium hydrogen tartrates. There is no additional parameter of high order terms except for the Onsager's coefficient of limited term in the new equation. Results show a complex conductance of acidic tartrates in aqueous solution. The molar conductivities of metal ions are nearly constant such that the contributions from hydrogen and tartrate ions decrease with concentration, while the molar conductivity of bitartrate ion increases with concentration.
基金financially supported by the Chongqing Research Program of Basic Research and Frontier Technology(No.cstc2016jcyjA0388)the National Natural Science Foundation of China(No.51701029),the Research and Development Project from COMAC and BOEING(No.2017-GT-088)+2 种基金China Postdoctoral Science Foundation Funded Project(Nos.2017M620410 and 2018T110942)the Chongqing Postdoctoral Scientific Research Foundation(No.Xm2017010)the Fundamental Research Funds for the Central Universities(No.2018CDGFCL005)。
文摘This study investigated the morphology, structure and tribological properties of the three samples produced by anodic oxidation of Ti10 V2 Fe3 Al in a sulfuric/phosphoric acid electrolyte(SPA), a near-neutral sodium tartrate electrolyte without nanoparticles(STA) and a nearneutral sodium tartrate electrolyte with polytetrafluoroethylene(PTFE) nanoparticles(CA) in suspension. The STA film had a surface full of bulges and cracks, the SPA film was porous, and the CA film was nanoporous. The SPA film was mainly composed of anatase TiO2, whereas the STA and CA films were mainly amorphous TiO2 with little anatase. The tribological tests indicated that the SPA sample had a lower wear resistance than the titanium alloy substrate, which was attributed to the shedding of abrasive debris, leading to rapid wear. Both STA and CA samples exhibited much lower wear rates than the titanium alloy substrate, and CA sample displayed the lowest wear rate attributed to the formation of a lubricating layer by PTFE nanoparticles. The wear mechanisms are proposed.
