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Electrodeposition of Zn-Active Metals Composite for Surface Treatment of Steel Sheets

电沉积锌活性金属复合材料用于钢板表面处理

基本信息

批准号：
16360366
负责人：
FUKUSHIMA Hisaaki
金额：
$ 9.47万
依托单位：
KYUSHU UNIVERCITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Electrodeposition of Zn with V was tried in un-agitated or agitated sulfate solutions containing Zn^<2+> and VO^<2+> at pH 0-3 and 40℃ under galvanostatic conditions. XPS spectra of deposits showed that V was involved in deposited Zn in form of V_2O_3 by hydrolysis of V^<3+> reduced from VO^<2+>. The content of V in deposits increased with increasing pH in solution and current density. These conditions appear to accelerate the hydrolysis of V ions as a result of an increase in hydrogen evolution in cathode layer. The partial polarization curve for Zn deposition was greatly polarized in solution containing VO^<2+> ions. This great polarization by addition of VO^<2+> ions is ascribed to the increase in resistance polarization as a result of formation of V_2O_3 resulting from hydrolysis of V^<3+>. SEM and EPMA images of deposits revealed that V in deposits segregated at edge of layered platelet crystals of Zn. The agitation of electrolyte decreased the content of V in deposits, but decreased the segregation of V_2O_3. The preferred orientation of deposited Zn was (0001) basal plane of hcp at the conditions where no V was involved in deposited Zn, while the orientation of (11 22) increased with increasing the content of V in deposits. The V_2O_3 codeposited with Zn seems to prohibit the growth of (0001) Zn basal plane. Anodic polarization curves for Zn dissolution in 3% NaCl solution were polarized by codeposition of V_2O_3 with Zn at V content less than 5 mass%. The corrosion current densities of deposits obtained from agitated solutions were smaller than those.from un-agitated solutions

在恒流条件下，在pH 0~3和40℃条件下，在含有锌和钒的硫酸盐溶液中，进行了含V的锌的电镀试验。X-射线光电子能谱(XPS)分析表明，VO^&lt；2+&gt；还原后的V^&lt；2+&gt；以V_2O_3的形式参与了锌的沉积。镀液pH和电流密度越高，镀层中V的含量越高。这些条件似乎加速了V离子的水解，这是阴极层放氢增加的结果。在含有VO~(2+)和Lt；~(2+)&Gt~(2+)的溶液中，锌沉积的部分极化曲线发生了明显的极化。VO~(2+)和Lt；~(2+)&Gt~(2+)离子的加入引起的这种大的极化归因于V~(2+)和~(2+)&Gt~(2+)的水解生成V_2O_3而导致电阻极化的增加。扫描电子显微镜和电子探针分析表明，沉积层中的V偏析在层状片状锌晶体的边缘。电解液的搅拌降低了镀层中V的含量，但降低了V_2O_3的偏析。在不含V的条件下，沉积锌的择优取向为(0001)HCP基面，而(11-22)择优取向随着镀层中V含量的增加而增加。V_2O_3与锌共沉积似乎抑制了(0001)锌基面的生长。在3%的氯化钠溶液中，当V含量小于5%时，V_2O_3与锌的共沉积使锌的阳极极化曲线极化。在搅拌溶液中得到的镀层的腐蚀电流密度比在非搅拌溶液中得到的要小。