Electrodeposition of less noble metals from aqueous solution containing inhibitor of hydrogen deposition

从含有氢沉积抑制剂的水溶液中电沉积较少贵金属

• 批准号: 13450297
• 负责人: FUKUSHIMA Hisaaki
• 金额: $ 8.7万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450297/
• 关键词: deposit; quaternary ammonium salt; hydrogen deposition; zinc deposition; Magnesium; Aluminum; polarization curve; corrosion resistance; 亜鉛電析; 加水分解反応; 水素析出量; 電流効率; TEM; マグネシウム含有率; 4級アンモニウム塩; 部分分極曲線; 分極

It was found that Mg and Al were electrodeposited with Zn in the sulfate solutions containing quaternary ammonium salt as additive. The partial polarization curves for H_2 and Zn deposition were significantly shifted to less noble direction by adding the quaternary ammonium salt. The contents of Mg and Al in deposits were increased with an increase in the polarization of H_2 and Zn deposition potential. The effect of the structure of quaternary ammonium salt on the H_2 and Zn deposition was investigated. H_2 and Zn deposition was more inhibited in the solution containing the additives with benzene ring in hydrophilic group and large alkyl group. The benzene ring and the large alkyl group seem to suppress the diffusion of H_2 and Zn ions to the cathode. The contents of Mg and Al in deposits were increased with an increase in the content of additives in deposits. Therefore, it was assumed that the adsorption of additives on the cathode play a important role in deposition of Mg and Al with Zn. The state of Mg in deposits was not clarified by XPS analysis. X-ray diffraction patterns of deposited Zn-Al showed that Al^<3+>-compound existed in the deposits was θ-Al_2O_3. TEM observation revealed that the codeposited Al_2O_3 with a small size of 10nm was homogeneously dispersed in the deposits. The corrosion resistance of deposits was significantly improved by co-deposition of small amount of Mg and Al.

研究发现，在含有季铵盐添加剂的硫酸盐溶液中，Mg和Al与Zn电沉积时，随着季铵盐含量的增加，H_2和Zn沉积的部分极化曲线显着向低惰性方向移动。沉积物中的Al随着H_2和Zn沉积电位的增加而增加。季铵盐的结构对H_2和Zn沉积的影响如下。研究发现，在含有亲水基团和大烷基的添加剂的溶液中，H_2和Zn的沉积受到更大的抑制，苯环和大烷基似乎抑制了H_2和Zn离子向阴极的扩散。沉积物中Mg和Al的含量随着沉积物中添加剂含量的增加而增加，因此，认为添加剂在阴极上的吸附在沉积物中起重要作用。 Mg和Al与Zn沉积物的X射线衍射图谱未明确沉积物中Mg的状态，TEM观察表明沉积物中存在Al^ 3+ -化合物。结果表明，共沉积的Al_2O_3尺寸为10nm，均匀分散在沉积物中，共沉积物的耐腐蚀性能显着提高。少量的镁和铝。

项目成果

大上 悟: "第4級アンモニウム塩を含む非懸濁溶液からのZn-Al_2O_3分散めっき"表面技術. 53・12. 920-925 (2002)

小上悟：“含季铵盐的非悬浮溶液的 Zn-Al_2O_3 分散镀” 表面技术 53・12（2002）。

Satoshi OUE: "Electrodeposition of Zn-Al_2O_3 Composite from Non-Suspended Solution Containing Quaternary Ammonium Salt"Journal of The Surface Finishing Society of Japan. Vol.53, No.12. 920-925 (2002)

Satoshi OUE：“从含有季铵盐的非悬浮溶液中电沉积 Zn-Al_2O_3 复合材料”日本表面处理学会期刊。