Study of corrosion protection of mild steel by eco-friendly silane sol-gel coating

被引：82
作者：
Asadi, N. [1 ]
Naderi, R. [1 ]
Saremi, M. [1 ]
Arman, S. Y. [2 ,3 ]
Fedel, M. [4 ]
Deflorian, F. [4 ]
机构：
[1] Univ Tehran, Sch Met & Mat Engn, Coll Engn, Tehran, Iran
[2] Amirkabir Univ Technol, Dept Min, Tehran, Iran
[3] Amirkabir Univ Technol, Dept Mat Engn, Tehran, Iran
[4] Univ Trento, Dept Ind Engn, I-38123 Trento, Italy
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2014年 / 70卷 / 03期
关键词：
Silane sol-gel film; Ecofriendly hybrid coating; Electrochemical noise; Electrochemical impedance spectroscopy; Surface analysis; BARRIER PROPERTIES; SILICA NANOPARTICLES; MAGNESIUM ALLOY; CARBON-STEEL; CURING TIME; CERIUM SALT; FILMS; INHIBITION; RESISTANCE; PRETREATMENT;
D O I：
10.1007/s10971-014-3286-8
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of dipping duration in the silane solution and the sol pH on the protective performance of an eco-friendly silane sol-gel coating consisting a mixture of tetraethoxysilane, methyltriethoxysilane and glycidyloxypropyltrimethoxysilane applied on mild steel substrate were studied in this paper using electrochemical techniques and surface analysis. In consistency with the data obtained from electrochemical impedance spectroscopy and polarization curves, electrochemical current noise fluctuation analysis, appearance of the power spectral density plots and noise resistance indicated the most efficient sol pH and immersion time in the silane solution. In this regard, field emission type scanning electron microscopy images and water contact angle values revealed impact of the sol pH on the film structure. The enhancement in protective performance of the hybrid coating resulting from optimum immersion in the silane solution with appropriate pH was connected to the film homogeneity and higher cross linking and thickness as well. Moreover, a good trend correlation was observed between the noise resistance and low-frequency impedance modulus data.
引用
收藏
页码：329 / 338
页数：10
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