A comprehensive study of the green hexafluorozirconic acid-based conversion coating

被引:64
|
作者
Mohammadloo, H. Eivaz [1 ,2 ]
Sarabi, A. A. [1 ]
Hosseini, R. Mohammad [1 ]
Sarayloo, M. [1 ]
Sameie, H. [2 ]
Salimi, R. [2 ]
机构
[1] Amirkabir Univ Technol, Fac Polymer Engn & Color Technol, Tehran, Iran
[2] Amirkabir Univ Technol, Color & Polymer Res Ctr, Tehran, Iran
关键词
Conversion coating; Hexafluorozirconic acid; Corrosion; Polarization; EIS; AFM; ZINC COATED STEEL; MAGNESIUM ALLOY; CORROSION-RESISTANCE; ALUMINUM-ALLOYS; IMMERSION TIME; MORPHOLOGY; SURFACE; FILMS; NANOCOMPOSITES; SEM;
D O I
10.1016/j.porgcoat.2013.10.006
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The effect of four practical parameters (deposition temperature, time, bath pH and concentration of Zr) on electrochemical and morphological properties of zirconium based conversion coating (ZrCC) on cold rolled steel (CRS) substrates was investigated. DC polarization and electrochemical impedance spectroscopy (EIS) measurements were used for electrochemical studies. Micro structural characterization was carried out by FE-SEM, AFM and EDS. The optimal conditions were determined as follows: solution temperature 20-30 C, immersion time 60-120 s, pH = 4 and acid concentration of 4% vol. In such condition, corrosion resistance values were maximum and uniformity was improved. Microscopical observations revealed that ZrCC comprises a two-layered structure. The film formation mechanism of ZrCC was discussed in detail. After achieving the optimum conditions, epoxy nanocomposites were applied on ZrCC treated CRS samples and corrosion performance of fully painted system was investigated. Finally the adhesion strength of subsequently applied organic coating on ZrCC treated substrates was measured by pull-off technique which exhibited considerable high values. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:322 / 330
页数:9
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