苄基环戊二烯的相转移催化合成

碱性不介质中和四丁基溴化铵存在下，环戊二烯和氯化苄反应，合成了苄基环戊二烯。     

带堆焊层钢管焊接接头耐蚀性的电化学评定

采用电化学测试技术评价了低碳钢管管端内壁不锈钢焊条堆焊后再用相同焊条进行打底焊所得焊接接头的耐蚀性，选用两种高合金焊条Ｍ２，Ｍ６，并对堆焊金属进行热模拟试验，测定了模拟热影响区不同部位在３％ＮａＣｌ介质中的阳极极化行为。结果表明，按新工艺焊接的接头代替碳钢焊接接头可有效地提高管道接头的使用寿命。     

催化光度法测定痕量银

本文研究了2.2'一联吡啶作活化剂,银(Ⅰ)催化过硫酸铵氧化甲基红褪色的新指标反应,对影响催化褪色反应速度的最佳条件进行了研究和选择,建立了测定痕量银(Ⅰ)的新方法.方法灵敏度为2.5×10~(-10)g银(Ⅰ)/ml,测定范围为5.0×10~(-10)～4.0×10~(-7)g银(Ⅰ)/ml,有较高的选择性,可直接用于测定矿井水中痕量银(Ⅰ),方法可靠,获得了满意的结果.     

1, 3-dioxolane pretreatment to improve the interracial characteristics of a lithium anode

1,3-dioxolane （DOL） was originally used to pretreat a lithium metal electrode to improve its interracial characteristics. Electrochemical impedance spectra （EIS） measurements revealed that, after the DOL pretreatment, the lithium electrode had better interfacial stability during immersion in electrolyte and as repeated charge/discharge cycles. It was proved by SEM that the pretreated one has smoother morphology and less dendrite after repeated charge/discharge cycles. Consequentially, benefiting from the better interface characteristics of the lithium electrode.