The effect of rolling processing on the microstructure,electrochemical property and anti-corrosion property of Al-Mg-Sn-Bi-Ga-In alloy anode in alkaline solution(80℃,Na2SnO3+5 mol/L NaOH)was analyzed by the chronopot...The effect of rolling processing on the microstructure,electrochemical property and anti-corrosion property of Al-Mg-Sn-Bi-Ga-In alloy anode in alkaline solution(80℃,Na2SnO3+5 mol/L NaOH)was analyzed by the chronopotentiometry (E-T curves),hydrogen collection tests and modern microstructure analysis.The results show that when the rolling temperature is 370℃,the electrochemical activity of Al anode decreases gradually with the increase of pass deformation in rolling,while the anti-corrosion property is improved in the beginning and then declined rapidly.When the pass deformation of rolling is 40%,the Al anode has good electrochemical activity as good as the anti-corrosion property and with the increase of rolling temperature,both electrochemical activity and anti-corrosion property of Al anode increase first and then decrease.When the rolling temperature is 420 ℃,the aluminum alloy anode has the most negative electrode potential of about-1.521 V(vs Hg/HgO)and the lowest hydrogen evolution rate of 0.171 6 mL/(min·cm2).The optimum comprehensive performance of Al alloy anode is obtained.展开更多
Zirconia-mullite composite ceramics were fabricated by in-situ controlled crystallization of Si-Al-Zr-O amorphous bulk.The effects of TiO2 addition on the fabrication of zirconia-mullite composites were investigated.T...Zirconia-mullite composite ceramics were fabricated by in-situ controlled crystallization of Si-Al-Zr-O amorphous bulk.The effects of TiO2 addition on the fabrication of zirconia-mullite composites were investigated.The ultra-fine zirconia-mullite composite ceramics were prepared from the amorphous bulk treated at 980 °C for nucleation and 1 140 °C for crystallization.The phase transformation of the ceramics was examined using differential scanning calorimetry (DSC) and X-ray diffractometry (XRD).The microstructural features of the samples were evaluated with scanning electron microscopy (SEM),energy dispersive spectroscopy (EDX) and transmission electron microscopy (TEM).The mechanical properties were also determined using Vickers indentation.The results show that the TiO2 additives with mass fraction of 1%-7% reduce the formation temperature of t-ZrO2 and mullite.When the mass fraction of TiO2 additives is less than 5%,the phases do not change,and most of TiO2 dissolves in ZrO2.When the mass fraction of TiO2 additives is over 5%,the excessive TiO2 forms a new phase,ZrTiO4.Meanwhile,the results also show that TiO2 additives have a great impact on the microstructure and mechanical properties of zirconia-mullite composites.As the TiO2 content increases from 1% to 7% (mass fraction),the grain size and the Vickers hardness of zirconia-mullite composites increase.The composite with 3% (mass fraction) TiO2 additives attains relatively higher fracture toughness.展开更多
文摘通过显微组织观察、拉伸力学性能测试、XRD衍射物相分析以及α(Al)基体点阵常数的测量等方法研究了固溶处理对7B04铝合金组织和性能的影响.结果表明:在410～470℃范围,随固溶温度升高和时间延长,由于粗大的平衡相逐渐回溶,合金的强度逐渐升高;进一步提高固溶温度或延长固溶时间,合金强度逐步降低.7B04铝合金的优选固溶处理制度为470℃×60 min.
基金Project(50721003) supported by the Creative Research Group of National Natural Science Foundation of China
文摘The effect of rolling processing on the microstructure,electrochemical property and anti-corrosion property of Al-Mg-Sn-Bi-Ga-In alloy anode in alkaline solution(80℃,Na2SnO3+5 mol/L NaOH)was analyzed by the chronopotentiometry (E-T curves),hydrogen collection tests and modern microstructure analysis.The results show that when the rolling temperature is 370℃,the electrochemical activity of Al anode decreases gradually with the increase of pass deformation in rolling,while the anti-corrosion property is improved in the beginning and then declined rapidly.When the pass deformation of rolling is 40%,the Al anode has good electrochemical activity as good as the anti-corrosion property and with the increase of rolling temperature,both electrochemical activity and anti-corrosion property of Al anode increase first and then decrease.When the rolling temperature is 420 ℃,the aluminum alloy anode has the most negative electrode potential of about-1.521 V(vs Hg/HgO)and the lowest hydrogen evolution rate of 0.171 6 mL/(min·cm2).The optimum comprehensive performance of Al alloy anode is obtained.
基金Project(50721003) supported by the National High Technology Research and Development Program of China for Creative Research Group
文摘Zirconia-mullite composite ceramics were fabricated by in-situ controlled crystallization of Si-Al-Zr-O amorphous bulk.The effects of TiO2 addition on the fabrication of zirconia-mullite composites were investigated.The ultra-fine zirconia-mullite composite ceramics were prepared from the amorphous bulk treated at 980 °C for nucleation and 1 140 °C for crystallization.The phase transformation of the ceramics was examined using differential scanning calorimetry (DSC) and X-ray diffractometry (XRD).The microstructural features of the samples were evaluated with scanning electron microscopy (SEM),energy dispersive spectroscopy (EDX) and transmission electron microscopy (TEM).The mechanical properties were also determined using Vickers indentation.The results show that the TiO2 additives with mass fraction of 1%-7% reduce the formation temperature of t-ZrO2 and mullite.When the mass fraction of TiO2 additives is less than 5%,the phases do not change,and most of TiO2 dissolves in ZrO2.When the mass fraction of TiO2 additives is over 5%,the excessive TiO2 forms a new phase,ZrTiO4.Meanwhile,the results also show that TiO2 additives have a great impact on the microstructure and mechanical properties of zirconia-mullite composites.As the TiO2 content increases from 1% to 7% (mass fraction),the grain size and the Vickers hardness of zirconia-mullite composites increase.The composite with 3% (mass fraction) TiO2 additives attains relatively higher fracture toughness.
