采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使M...采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使Mg-Al-Pb-La镁合金的晶粒细化、第二相破碎、再结晶程度降低、Mg-Al-Pb-La镁合金的放电活性增强、耐蚀性变差和阳极效率降低;当轧制变形量为40%时,镁合金的综合放电性能优良,在电流密度180 m A/cm^2下平均放电电位和阳极效率分别为-1.749 V(vs SCE)和(82.9±0.2)%。展开更多
b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resi...b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resistance at open circlepotential, and exhibits better discharge activity than the Mg-Al-Pb alloy. The utilization efficiency of Mg-Al-Pb-La anode ishigher than that of commercial Mg-Al-Zn （AZ） and Mg-Al-Mn （AM） alloys. A single Mg-air battery with Mg-Al-Pb-La alloy asthe anode and air as the cathode has an average discharge potential of 1.295 V and a discharge capacity of 1370 mA·h/g duringdischarge at 10 mA/cm2, which is higher than that of batteries using Mg-Li anodes. The enhancement in discharge performance ofthe Mg-Al-Pb-La anode is caused by its modified microstructure, which reduces the self-corrosion and accelerates the spalling ofoxidation products during battery discharge. Furthermore, the dissolution mechanism of Mg-Al-Pb-La anode during the dischargeprocess was analyzed.展开更多
An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy(mass fraction) in 3.5% Na Cl(mass fraction) solution was conducted using electrochemical measurements and corroded mo...An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy(mass fraction) in 3.5% Na Cl(mass fraction) solution was conducted using electrochemical measurements and corroded morphology observation, in which solid solution and the as-aged state of each alloy were compared to discuss the influence mechanism of lead and aluminium on the electrochemical properties of alloys. The X-ray diffraction(XRD) analysis was performed to make microstructure characterization. The electrochemical results indicate that the corrosion of Mg-5%Pb alloy is predominated by homogeneous pitting and dissolution of PbCl_2 film due to Cl ions attack, while corrosion crevice propagates along grain boundaries in solid solution of Mg-6%Al alloy and the micro galvanic corrosion also plays vital role in Mg_(17)Al_(12) phase containing experimental alloys. The co-existence of lead and aluminium in magnesium alloy increases corrosion current density and electrochemical activity as well. The comparison between solid solution and the as-aged state demonstrates that Mg_2 Pb and Mg_(17)Al_(12) somewhat increase corrosion resistance but lighten anodic polarization by facilitating corrosion product flaking off.展开更多
目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子...目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子体发射光谱仪,发射功率1.2 k W,等离子气流量15 L·min^-1,辅助气流量1.5 L·min^-1,雾化气压200 k Pa,泵速15 r·min^-1,进样延迟时间为30 s。结果：白骨壤果实中含有丰富的微量元素Mg、Al、Fe、Mn等,而Cd和As含量极低或未检出。精密度试验的RSD为0.8%-3.6%,加标回收率为96.2%-102.4%。结论：建立的微波消解-ICP-OES分析方法可测定白骨壤果实中多种微量元素,同时为测定其他药材中微量元素的测定提供参考和理论依据。展开更多
文摘采用熔炼铸造和塑性变形方法制备Mg-Al-Pb-La镁合金。采用扫描电镜和X射线衍射等方法研究轧制对Mg-Al-Pb-La镁合金显微组织的影响,采用动电位极化和恒电流放电等方法研究轧制对Mg-Al-Pb-La镁合金腐蚀电化学行为的影响。结果表明:轧制使Mg-Al-Pb-La镁合金的晶粒细化、第二相破碎、再结晶程度降低、Mg-Al-Pb-La镁合金的放电活性增强、耐蚀性变差和阳极效率降低;当轧制变形量为40%时,镁合金的综合放电性能优良,在电流密度180 m A/cm^2下平均放电电位和阳极效率分别为-1.749 V(vs SCE)和(82.9±0.2)%。
基金Project(2015JC3004)supported by the Science and Technology Plan of Hunan Province,ChinaProject(2016JJ2147)supported by the Natural Science Foundation of Hunan Province,ChinaProject(51401243)supported by the National Natural Science Foundation of China
文摘b The discharge performance of Mg-Al-Pb-La anode was investigated by electrochemical techniques and compared withthat of Mg-Al-Pb alloy. The results indicate that the Mg-Al-Pb-La anode provides enhanced corrosion resistance at open circlepotential, and exhibits better discharge activity than the Mg-Al-Pb alloy. The utilization efficiency of Mg-Al-Pb-La anode ishigher than that of commercial Mg-Al-Zn （AZ） and Mg-Al-Mn （AM） alloys. A single Mg-air battery with Mg-Al-Pb-La alloy asthe anode and air as the cathode has an average discharge potential of 1.295 V and a discharge capacity of 1370 mA·h/g duringdischarge at 10 mA/cm2, which is higher than that of batteries using Mg-Li anodes. The enhancement in discharge performance ofthe Mg-Al-Pb-La anode is caused by its modified microstructure, which reduces the self-corrosion and accelerates the spalling ofoxidation products during battery discharge. Furthermore, the dissolution mechanism of Mg-Al-Pb-La anode during the dischargeprocess was analyzed.
基金Project supported by 2015 Shandong Provincal Fund for Outstanding Talent Group,China
文摘An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy(mass fraction) in 3.5% Na Cl(mass fraction) solution was conducted using electrochemical measurements and corroded morphology observation, in which solid solution and the as-aged state of each alloy were compared to discuss the influence mechanism of lead and aluminium on the electrochemical properties of alloys. The X-ray diffraction(XRD) analysis was performed to make microstructure characterization. The electrochemical results indicate that the corrosion of Mg-5%Pb alloy is predominated by homogeneous pitting and dissolution of PbCl_2 film due to Cl ions attack, while corrosion crevice propagates along grain boundaries in solid solution of Mg-6%Al alloy and the micro galvanic corrosion also plays vital role in Mg_(17)Al_(12) phase containing experimental alloys. The co-existence of lead and aluminium in magnesium alloy increases corrosion current density and electrochemical activity as well. The comparison between solid solution and the as-aged state demonstrates that Mg_2 Pb and Mg_(17)Al_(12) somewhat increase corrosion resistance but lighten anodic polarization by facilitating corrosion product flaking off.
文摘目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子体发射光谱仪,发射功率1.2 k W,等离子气流量15 L·min^-1,辅助气流量1.5 L·min^-1,雾化气压200 k Pa,泵速15 r·min^-1,进样延迟时间为30 s。结果：白骨壤果实中含有丰富的微量元素Mg、Al、Fe、Mn等,而Cd和As含量极低或未检出。精密度试验的RSD为0.8%-3.6%,加标回收率为96.2%-102.4%。结论：建立的微波消解-ICP-OES分析方法可测定白骨壤果实中多种微量元素,同时为测定其他药材中微量元素的测定提供参考和理论依据。
