通过电导率监视仪对硅烷的水解过程进行监控，确定了KH560的水解时间为3 h，含不同质量分数鳞片锌粉的硅烷/锌复合液的水解时间为12 h。将硅烷/锌水解液涂覆到低碳钢表面，制备了复合硅烷/锌涂层。通过盐雾试验、极化曲线和交流阻抗谱研究了不同锌粉含量的硅烷/锌复合涂层的耐蚀性能，通过扫描电镜观察了涂层的截面形貌，探讨了硅烷/锌复合涂层的耐蚀机理。结果表明，复合硅烷/锌涂层的耐蚀性能随着锌粉含量的增加而提高，鳞片锌粉的最大添加量为45%。此含量下的复合硅烷/锌涂层的耐蚀性能最好，中性盐雾时间达576 h，是纯硅烷涂层的12倍。在此硅烷/锌复合涂层中，鳞片锌粉以平行叠加的方式组成致密的网状结构，从而延长了腐蚀性介质到达金属基材的时间，使涂层的耐蚀性能得到明显提高。
The hydrolysis process of silane was monitored by a on-line conductivity monitor. The hydrolysis time was determined as 3 h for KH560 and 12 h for silane/zinc composite solutions with different mass fractions of flake zinc powder. A silane/zinc composite coating was prepared by coating the hydrolyzed silane/zinc composite solution on mild steel surface. The corrosion resistance of the composite coatings with different contents of zinc powders was examined by salt spray test, polarization curve measurement, and AC impedance spectroscopy. The section morphologies of the coatings were observed by scanning electron microscopy. The anticorrosion mechanism of silane/zinc composite coating was discussed. The results showed that the corrosion resistance of silane/zinc composite coating is improved with increasing content of zinc powder, and reaches the best when the content of flake zinc powders is up to 45%. The coating obtained therewith endured 576 h in neutral salt spray test, which was 12 times that of the coating without zinc powder. The flake zinc powders form a compact network structure by superposing parallel, leading to slower pass of corrosion media to metal substrate, thus remarkably improving the corrosion resistance.
参考文献
| [1] | Trabelsi W;Triki E;Dhouibi L;Ferreira MGS;Zheludkevich ML;Montemor MF .The use of pre-treatments based on doped silane solutions for improved corrosion resistance of galvanised steel substrates[J].Surface & Coatings Technology,2006(14/15):4240-4250. |
| [2] | Montemor MF;Rosqvist A;Fagerholm H;Ferreira MGS .The early corrosion behaviour of hot dip galvanised steel pre-treated with bis-1,2-(triethoxysilyl)ethane[J].Progress in Organic Coatings: An International Review Journal,2004(3):188-194. |
| [3] | 王雪明,李爱菊,李国丽,管从胜.硅烷偶联剂在防腐涂层金属预处理中的应用研究[J].材料科学与工程学报,2005(01):146-150. |
| [4] | 徐溢,滕毅,徐铭熙.硅烷偶联剂应用现状及金属表面处理新应用[J].表面技术,2001(03):48-51. |
| [5] | 李新波,曾鹏,谢光荣,石存秀,雷敏娟.稀土镧盐对水性锌铝涂层的钝化作用[J].材料保护,2011(10):19-22. |
| [6] | 雷敏娟,曾鹏,谢光荣,李新波,程准.片状玻璃对水性复合锌铝合金涂层耐蚀性的影响[J].电镀与涂饰,2012(07):59-63. |
| [7] | 杨振波,杨忠林,郭万生,宋广成.鳞片状富锌涂层耐蚀机理的研究[J].中国涂料,2006(01):19-21. |
| [8] | Marchebois H.;Joiret S.;Savall C.;Bernard J.;Touzain S. .Characterization of zinc-rich powder coatings by EIS and Raman spectroscopy[J].Surface & Coatings Technology,2002(2/3):151-161. |
| [9] | 于晓辉,朱晓云,郭忠诚,龙晋明.鳞片状锌基环氧富锌重防腐涂料的研制[J].表面技术,2005(01):53-55. |
| [10] | 吴森纪.有机硅及其应用[M].北京:科学技术文献出版社,1990:282-285. |
| [11] | ARKLES B .Tailoring surfaces with silanes[J].CHEMTECH,1977,7:766-778. |
| [12] | Cabral AM;Duarte RG;Montemor MF;Ferreira MGS .A comparative study on the corrosion resistance of AA2024-T3 substrates pre-treated with different silane solutions - Composition of the films formed[J].Progress in Organic Coatings: An International Review Journal,2005(4):322-331. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%