目的：提高化学镀 Ni-P 镀层的耐蚀性能。方法在钢铁基体表面化学镀 Ni-P 镀层,采用植酸、硅酸钠、钼酸铵和双氧水中的一种或多种复配对镀层进行钝化处理。通过硝酸点滴法、贴滤纸法分析镀层耐蚀性的变化,并通过正交实验确定四种物质复配的最佳浓度。结果以植酸、硅酸钠、钼酸铵和双氧水为主要成分配制的复合缓蚀剂能使镀层耐硝酸效果良好,电化学实验表明,复合钝化膜的腐蚀电流密度降低和阻抗值增加都超过1个数量级。结论所研究的复合缓蚀剂各组分间存在协同效应,最佳配方为：6 g / L 植酸,6 g / L 硅酸钠,4 g / L 钼酸铵,30 mL/ L 双氧水。
Objective To improve the corrosion resistance of electroless Ni-P coating. Methods Passivation treatment for corro-sion inhibition was conducted with phytic acid, sodium silicate, ammonium molybdate and hydrogen peroxide on the electroless Ni-P coating prepared on the steel substrate. The variation of corrosion resistance was investigated by dropping test and filter paper method. The optimal compositions of passivation solution were obtained by orthogonal experiments. Results The results showed that the complex inhibitor solution composed of phytic acid, sodium silicate, ammonium molybdate and hydrogen peroxide had good cor-rosion resistance in nitric acid dropping test. The electrochemical test showed that the corrosion current density of the composite passivation coating decreased and the impedance values increased by more than one order of magnitude. Conclusion The synergis-tic effect among the components in the passivation solution was observed. The optimized compositions of passivation solution were 6 g/ L of phytic acid, 6 g/ L of sodium silicate, 4 g/ L of ammonium molybdate, and 30 mL/ L of hydrogen peroxide.
参考文献
| [1] | 李宁.化学镀实用技术[M].北京:化学工业出版社,2004 |
| [2] | 方景礼.NT-1镀镍防变色工艺研究[J].材料保护,1992(09):16. |
| [3] | 郭莉莉,孙莹.化学镀镍制品铬酸钝化与否的判断[J].中国表面工程,2007(02):30-32,36. |
| [4] | LIU Guangming,YU Fei,YANG Liu,TIAN Jihong,DU Nan.Cerium-tannic acid passivation treatment on galvamzed steel[J].稀有金属(英文版),2009(03):284-288. |
| [5] | 许乔瑜,左茜.热浸镀锌层偏钒酸盐转化膜成膜工艺的研究[J].表面技术,2010(04):69-72. |
| [6] | Veeraraghavan B.;Slavkov D.;Prabhu S.;Nicholson M.;Haran B.;Popov B. Heimann B. .Synthesis and characterization of a novel non-chrome electrolytic surface treatment process to protect zinc coatings[J].Surface & Coatings Technology,2003(1):41-51. |
| [7] | LIU Guang-ming;YANG Liu;YU Fei et al.Cerium-Phytic Acid Passivation Treatment on Galvanized Steel[J].Key Engineering Materials,2008,373/374:228-231. |
| [8] | 杨柳,刘光明,钱余海,杜楠.镀锌钢板铈盐钝化的电化学性能研究[J].表面技术,2006(06):11-14. |
| [9] | 李玉明,刘静敏,马志超,匡云飞.钼酸盐与磷酸盐、硅酸盐复配缓蚀剂的研究[J].腐蚀与防护,2004(06):248-251. |
| [10] | 唐锋,胡光辉,黄华娥,潘湛昌,魏志钢,曾海霞.化学镀镍层无铬钝化工艺的研究[J].电镀与精饰,2012(05):28-32,46. |
| [11] | 张允诚;胡如南;向荣.电镀手册[M].北京:国防工业出版社,1997 |
| [12] | 崔秀芳,李庆芬.镁合金表面植酸转化膜研究Ⅰ植酸转化膜成膜机理与耐蚀性研究[J].腐蚀科学与防护技术,2007(03):203-206. |
| [13] | 施绍队 .镀锌层硅酸盐无铬黑色钝化工艺研究[D].昆明:昆明理工大学,2012. |
| [14] | 马奇,杨道武,任卓,刘义,徐翔,湛文光.双氧水钝化对碳钢耐腐蚀行为的研究[J].清洗世界,2012(05):11-14. |
| [15] | 韩克平.镀锌层表面硅酸盐防腐膜的研究[J].腐蚀科学与防护技术,1997(02):167. |
| [16] | LIU Guang-ming;LIU Yang;DU Nan .Study of Molybdate-Phy-tic Acid Passivation on Galvanized Steel[J].Corrosion Engi-neering Science and Technology,2011,46(04):542-546. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%