To explore the corrosion properties of magnesium alloys, the chemical behavior of a high strength Mg_(97)Zn_(1)Y_(2)-1 wt.%Si C alloy in different corrosion environments was studied. Three solutions of 0.2 mol·L^...To explore the corrosion properties of magnesium alloys, the chemical behavior of a high strength Mg_(97)Zn_(1)Y_(2)-1 wt.%Si C alloy in different corrosion environments was studied. Three solutions of 0.2 mol·L^(-1) NaCl, Na_(2)SO_(4) and NaNO_(3) were selected as corrosion solutions. The microstructures, corrosion rate, corrosion potential, and mechanism were investigated qualitatively and quantitatively by optical microscopy(OM), scanning electron microscopy(SEM), immersion testing experiment, and electrochemical test. Microstructure observation shows that the Mg_(97) Zn_(1)Y_(2)-1 wt.%Si C alloy is composed of α-Mg matrix, LPSO(Mg_(12) ZnY) phase and Si C phase. The hydrogen evolution and electrochemical test results reflect that the Mg_(97)Zn_(1)Y_(2)-1 wt.%SiC in 0.2 mol·L^(-1) Na Cl solution has the fastest corrosion rate, followed by Na_(2)SO_(4) and NaNO_(3) solutions, and that the charge-transfer resistance presents the contrary trend and decreases in turn.展开更多
为制备出绿色环保且耐蚀性能更好的镁合金阳极氧化膜,以无害、无污染的氢氧化钠、硅酸钠、碳酸钠和柠檬酸钠为电解液主要成分,以不同的电流密度(5~20 m A/cm^2)对Mg_(97)Y_2Zn_1-0.5Al合金进行阳极氧化,通过扫描电镜观察阳极氧化膜的表...为制备出绿色环保且耐蚀性能更好的镁合金阳极氧化膜,以无害、无污染的氢氧化钠、硅酸钠、碳酸钠和柠檬酸钠为电解液主要成分,以不同的电流密度(5~20 m A/cm^2)对Mg_(97)Y_2Zn_1-0.5Al合金进行阳极氧化,通过扫描电镜观察阳极氧化膜的表面形貌,利用动电位极化曲线和3.5%Na Cl水溶液浸泡试验检测膜层的耐腐蚀性能,研究了电流密度对膜层表面形貌与性能的影响。结果表明:恒流条件下不同电流密度时的阳极氧化过程均分为氧化膜快速生长、缓慢生长及生长相对平稳3个时期;随着电流密度的增加,氧化膜上的孔洞数目逐渐减少,孔径逐渐增大,膜层的耐蚀性能先增强后减弱;15 m A/cm^2电流密度下所得膜层的孔洞与裂纹较少,孔径较小,自腐蚀电流密度最小,腐蚀失重最小,耐蚀性最好。展开更多
目的:研究参芪扶正注射液与干扰素α(IFN-α)联用时对肝癌细胞STAT1基因表达的影响,探讨其对IFN-α协同增效的作用机制。方法:运用MTT法检测IFN-α注射液单独或与参芪扶正注射液联合对MHCC97-L细胞增殖的影响;运用Real-time PCR和Wester...目的:研究参芪扶正注射液与干扰素α(IFN-α)联用时对肝癌细胞STAT1基因表达的影响,探讨其对IFN-α协同增效的作用机制。方法:运用MTT法检测IFN-α注射液单独或与参芪扶正注射液联合对MHCC97-L细胞增殖的影响;运用Real-time PCR和Western-blot分别检测IFN-α单独或与参芪扶正注射液联用对STAT1 RNA和蛋白质表达的影响;构建STAT1干扰慢病毒载体并实现其在MHCC97-L中表达,通过RT-PCR、We s te rn-Blot验证其干扰STAT1表达的有效性;MTT法检测IFN-α单独或联合参芪扶正注射液对STAT1基因"沉默"细胞株增殖的影响。结果 :与单独使用IFN-α相比,参芪扶正注射液与IFN-α联用可以增强IFN-α对人肝癌MHCC97-L的抑制作用(P<0.01),并上调STAT1 mRNA(P<0.05)和蛋白质的表达(P<0.05);成功构建STAT1基因"沉默"的MHCC97-L细胞株;参芪扶正注射液协同IFN-α对STAT1基因"沉默"MHCC97-L的抑制率与单独使用IFN-α差异无统计学意义(P>0.05)。结论:参芪扶正注射液可上调人肝癌细胞MHCC97-L中STAT1的表达,从而提高IFN-α的疗效。展开更多
基金Financially supported by the National Natural Science Foundation of China (51665012)the Jiangxi Province Science Foundation for Outstanding Scholarship (20171BCB23061,2018ACB21020)the Primary Research & Development Plan of Jiangxi Province (20192BBEL50019)。
文摘To explore the corrosion properties of magnesium alloys, the chemical behavior of a high strength Mg_(97)Zn_(1)Y_(2)-1 wt.%Si C alloy in different corrosion environments was studied. Three solutions of 0.2 mol·L^(-1) NaCl, Na_(2)SO_(4) and NaNO_(3) were selected as corrosion solutions. The microstructures, corrosion rate, corrosion potential, and mechanism were investigated qualitatively and quantitatively by optical microscopy(OM), scanning electron microscopy(SEM), immersion testing experiment, and electrochemical test. Microstructure observation shows that the Mg_(97) Zn_(1)Y_(2)-1 wt.%Si C alloy is composed of α-Mg matrix, LPSO(Mg_(12) ZnY) phase and Si C phase. The hydrogen evolution and electrochemical test results reflect that the Mg_(97)Zn_(1)Y_(2)-1 wt.%SiC in 0.2 mol·L^(-1) Na Cl solution has the fastest corrosion rate, followed by Na_(2)SO_(4) and NaNO_(3) solutions, and that the charge-transfer resistance presents the contrary trend and decreases in turn.
文摘为制备出绿色环保且耐蚀性能更好的镁合金阳极氧化膜,以无害、无污染的氢氧化钠、硅酸钠、碳酸钠和柠檬酸钠为电解液主要成分,以不同的电流密度(5~20 m A/cm^2)对Mg_(97)Y_2Zn_1-0.5Al合金进行阳极氧化,通过扫描电镜观察阳极氧化膜的表面形貌,利用动电位极化曲线和3.5%Na Cl水溶液浸泡试验检测膜层的耐腐蚀性能,研究了电流密度对膜层表面形貌与性能的影响。结果表明:恒流条件下不同电流密度时的阳极氧化过程均分为氧化膜快速生长、缓慢生长及生长相对平稳3个时期;随着电流密度的增加,氧化膜上的孔洞数目逐渐减少,孔径逐渐增大,膜层的耐蚀性能先增强后减弱;15 m A/cm^2电流密度下所得膜层的孔洞与裂纹较少,孔径较小,自腐蚀电流密度最小,腐蚀失重最小,耐蚀性最好。
文摘目的:研究参芪扶正注射液与干扰素α(IFN-α)联用时对肝癌细胞STAT1基因表达的影响,探讨其对IFN-α协同增效的作用机制。方法:运用MTT法检测IFN-α注射液单独或与参芪扶正注射液联合对MHCC97-L细胞增殖的影响;运用Real-time PCR和Western-blot分别检测IFN-α单独或与参芪扶正注射液联用对STAT1 RNA和蛋白质表达的影响;构建STAT1干扰慢病毒载体并实现其在MHCC97-L中表达,通过RT-PCR、We s te rn-Blot验证其干扰STAT1表达的有效性;MTT法检测IFN-α单独或联合参芪扶正注射液对STAT1基因"沉默"细胞株增殖的影响。结果 :与单独使用IFN-α相比,参芪扶正注射液与IFN-α联用可以增强IFN-α对人肝癌MHCC97-L的抑制作用(P<0.01),并上调STAT1 mRNA(P<0.05)和蛋白质的表达(P<0.05);成功构建STAT1基因"沉默"的MHCC97-L细胞株;参芪扶正注射液协同IFN-α对STAT1基因"沉默"MHCC97-L的抑制率与单独使用IFN-α差异无统计学意义(P>0.05)。结论:参芪扶正注射液可上调人肝癌细胞MHCC97-L中STAT1的表达,从而提高IFN-α的疗效。
