针对某型机车电机转子端环与导条钎焊用含镉钎料BAg40CuZnCdNi因列入限用禁用物质目录,急需替代为无镉钎料的问题,采用无镉钎料BAg55ZnCuSn和钎剂SAXONIA Braze Tec h Paste-Type-FH10与原含镉钎料和钎剂QJ102进行对比验证。运用化学分...针对某型机车电机转子端环与导条钎焊用含镉钎料BAg40CuZnCdNi因列入限用禁用物质目录,急需替代为无镉钎料的问题,采用无镉钎料BAg55ZnCuSn和钎剂SAXONIA Braze Tec h Paste-Type-FH10与原含镉钎料和钎剂QJ102进行对比验证。运用化学分析法对验证用钎料进行化学成分分析,DSC熔化温度测试仪(温升曲线法)进行钎料熔化范围分析,高温润湿炉进行钎剂流铺性和钎料润湿性分析,确定了无镉钎料与钎剂的最优组合。转子工艺模卡验证结果表明,电机转子模卡端环与导条钎焊接头拉伸断裂于导条热影响区,力学性能合格,无镉钎料BAg55ZnCuSn和钎剂SAXONIA Braze Tec h Paste-Type-FH10可以用于该型机车电机转子无镉化替代。展开更多
We investigated the reduction of lepidocrocite(γ-FeOOH) by Shewanella oneidensis MR-1 in the presence and absence of Cd. The results showed that Cd^(2+) retarded microbial reduction of γ-Fe OOH and avoided formation...We investigated the reduction of lepidocrocite(γ-FeOOH) by Shewanella oneidensis MR-1 in the presence and absence of Cd. The results showed that Cd^(2+) retarded microbial reduction of γ-Fe OOH and avoided formation of magnetite. The inhibitory effect on γ-Fe OOH transformation may not result from Cd^(2+) toxicity to the bacterium; it rather was probably due to competitive adsorption between Cd^(2+) and Fe^(2+) on γ-Fe OOH as its surface reduction catalyzed by adsorbed Fe^(2+) was eliminated by adsorption of Cd^(2+).展开更多
文摘针对某型机车电机转子端环与导条钎焊用含镉钎料BAg40CuZnCdNi因列入限用禁用物质目录,急需替代为无镉钎料的问题,采用无镉钎料BAg55ZnCuSn和钎剂SAXONIA Braze Tec h Paste-Type-FH10与原含镉钎料和钎剂QJ102进行对比验证。运用化学分析法对验证用钎料进行化学成分分析,DSC熔化温度测试仪(温升曲线法)进行钎料熔化范围分析,高温润湿炉进行钎剂流铺性和钎料润湿性分析,确定了无镉钎料与钎剂的最优组合。转子工艺模卡验证结果表明,电机转子模卡端环与导条钎焊接头拉伸断裂于导条热影响区,力学性能合格,无镉钎料BAg55ZnCuSn和钎剂SAXONIA Braze Tec h Paste-Type-FH10可以用于该型机车电机转子无镉化替代。
基金financially supported by the National Natural Science Foundation of China(41601239)the Highlevel Leading Talent Introduction Program of GDAS,the China Postdoctoral Science Foundation(2016M600644)the"Pearl River Talents"Postdoctoral Program of Guangdong Province,and the National Key Research and Development Program of China(2016YFD0800703)
文摘We investigated the reduction of lepidocrocite(γ-FeOOH) by Shewanella oneidensis MR-1 in the presence and absence of Cd. The results showed that Cd^(2+) retarded microbial reduction of γ-Fe OOH and avoided formation of magnetite. The inhibitory effect on γ-Fe OOH transformation may not result from Cd^(2+) toxicity to the bacterium; it rather was probably due to competitive adsorption between Cd^(2+) and Fe^(2+) on γ-Fe OOH as its surface reduction catalyzed by adsorbed Fe^(2+) was eliminated by adsorption of Cd^(2+).
