Effect of SCN~- on the Transition Current of Zn during the Electrodeposition Zn-Co Alloys

　在硫酸盐电解液中的Zn＿Co合金共沉积,存在着由正常共沉积转变成异常共沉积的Zn转移电流密度,该值随着电解液中所含SCN-浓度的增加而增加,pH值的增加而减小.这主要是因为SCN-降低了Co的析出过电位,但不影响Zn及H2的析出过电位之故.For co_deposition of Zn_Co alloys at sufphate baths with micro_concentration of SCN- the transition current of Zn was found with the deposition process changing from normal Co_deposition to anomalous co_deposition, and the value of transition current increased with increasing SCN- concentration, but decreased with increasing value of pH. The existence of SCN- decreases the evolution overpotential of Co metal, but has no effects on the evolution overpotential of Zn metal and H2.作者联系地址：上海大学理学院化学系,上海大学理学院化学系,上海大学理学院化学系 上海200436 ,上海200436 ,上海200436Author's Address: Shanghai University, Shanghai 200436 Chin

Effect of Cl - on the Transition Current Density of Zn during the Electrodeposition of Zn-Ni Alloys

在氯化物电解液中Zn_Ni合金共沉积存在着由正常共沉积转变成异常共沉积的Zn转移电流密度 ,该转移电流密度随着Cl-浓度的增加而增加 ,而与溶液pH值基本无关 .这是由于Cl-的存在降低了Ni的析出过电位 ,并对Ni的析出有催化作用之故There exists a transition current density of Zn when the normal co_deposition of Zn_Ni alloys at chloride baths turns to anomalous type.The value increases with Cl - concentration, but is independent of pH, this is because the existence of Cl - decreases the evolution overpotential of Ni metal and has a catalytic effect on it.作者联系地址：上海大学理学院化学系,上海大学理学院化学系,上海大学理学院化学系 上海200436 ,上海200436 ,上海200436Author's Address: Shanghai University,Shanghai 200436,Chin

Pure Iron Electrolyzed from Scrap Iron Chips and its Corrosion Characteristics

　以工业废铁屑作原料制备高纯度电解铁,并优化了在氯化物溶液中的电解工艺条件,所得样品纯度最高可达到99.983%.通过SEM断面形貌观察,该电解铁样品非常致密.交流阻抗及腐蚀速率测定表明,电解铁的纯度越高,其耐腐蚀性能越好.The high purity electrolytic iron was made from scrap iron chips. Electrolytic conditions of pure iron were determined in chloride baths and the highest purity was 99.983% by chemical analysis. Pure iron had very compact texture and high mechanical strength by SEM figures of cross section. In deaerated 0.5 kmol·m-3H2SO4 and 0.5 kmol·m-3NaCl solutions, the corrosion rate of iron decreased with increasing purity.作者联系地址：上海大学理学院化学系,上海大学理学院化学系,上海大学理学院化学系,上海大学理学院化学系 上海200436 ,上海200436 ,上海200436 ,上海200436Author's Address: Dept.Chem.Shanghai University,Shanghai 200436,Chin

Study of Electrolyzed Pure Iron and RRR_H Method

以工业废铁屑为原料制备高纯度电解铁 ,纯度可达 99.98%以上 .应用剩余电阻率比(RRRH)法 ,在外加垂直磁场 80 0 0e下分别测定该电解铁在 4 .2K和 2 98K时的电阻率 ,并得出样品对应的剩余电阻率比 (RRRH) .研究表明 :电解铁纯度越高 ,其RRRH 越大 .通过SEM断面形貌观察 ,在Ti基片上电解制备的纯铁非常致密The high purity electrolytic iron was made from scrap iron chips. The purity of electrolyzed pure iron was above 99.98% by chemical analysis. The resistivity was measured at 298 K and at 4.2 K under an applied longitudinal_magnetic field of 800 0 e. The ratio of resistivity at 298 K to that at 4.2 K, The value of residual resistivity ratio (RRR H) roughly depended on the purity of iron. Pure iron electrolyzed on Ti substrate had very compact texture as evident by SEM.作者联系地址：上海大学理学院化学系,上海大学理学院化学系,上海大学理学院化学系,上海大学理学院物理系,华东理工大学国家重点化学工程联合实验室 上海 ,上海 ,上海 ,上海200436 ,上海200237Author's Address: 1. Dept. Chem..Shanghai University, Shanghai 200436, China, 2. Dept. Phys. Shanghai University, Shanghai 200436, China, 3. China National United Engineering Laboratory ECUST.Shanghai 200237, Chin