The protective properties of epoxy coating electrodeposited on Zn-Mn alloy substrate

被引：15
作者：
Bucko, M. [1 ]
Miskovic-Stankovic, V. [1 ]
Rogan, J. [1 ]
Bajat, J. B. [1 ]
机构：
[1] Univ Belgrade, Fac Technol & Met, Belgrade 11120, Serbia
来源：
PROGRESS IN ORGANIC COATINGS | 2015年 / 79卷
关键词：
Zn-Mn alloy; Epoxy coating; Impedance spectroscopy; Cataphoretic deposition; CORROSION PROTECTION; ADHESION; BEHAVIOR; ELECTROLYTE;
D O I：
10.1016/j.porgcoat.2014.10.010
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The epoxy coating was cataphoretically deposited on steel and steel modified by electroplated Zn-Mn alloy of different chemical contents. The samples were immersed in 0.5 mol dm(-3) NaCl solution for 60 days. The electrochemical impedance spectroscopy (EIS) analysis showed that the values of pore resistance for epoxy coating on steel and Zn-Mn alloy with 16 at.% Mn were two orders of magnitude higher, while the capacitance values were two orders of magnitude lower than those for the epoxy coating on Zn-Mn alloy substrates with 5 and 8 at.% Mn. It was assumed that the main reason for such a difference was metallic substrate dissolution during cataphoretic deposition, due to high pH (12.9). This assumption was supported by energy dispersive X-ray spectrometry (EDS) measurements showing that the amount of released Zn in epoxy coatings decreased as Mn percent in the Zn-Mn alloys increased. In addition, Zn-Mn alloy coatings on steel, as well as bare steel, were immersed in 0.1 mol dm(-3) NaOH solution, pH 12.9, simulating conditions during cataphoretic deposition, and polarization resistance measurement in this solution indicated that Mn inclusions in Zn-Mn alloy substrate prevent Zn dissolution in alkaline medium. (C) 2014 Elsevier B.V. All rights reserved.
引用
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页码：8 / 16
页数：9
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