Effects of surface treatment of aluminium alloy 1050 on the adhesion and anticorrosion properties of the epoxy coating

被引：91
作者：
Golru, S. Sharifi [1 ]
Attar, M. M. [1 ]
Ramezanzadeh, B. [2 ]
机构：
[1] Amirkabir Univ Technol, Dept Polymer Engn & Color Technol, Tehran, Iran
[2] Inst Color Sci & Technol, Dept Surface Coating & Corros, Tehran, Iran
来源：
APPLIED SURFACE SCIENCE | 2015年 / 345卷
关键词：
Aluminium alloy; Zirconium conversion coating; Epoxy coating; AFM; Contact angle; Pull-off adhesion strength; CONVERSION COATINGS; CORROSION PROTECTION; PRETREATMENT; PERFORMANCE; RESISTANCE; MECHANISM; MORPHOLOGY; PARTICLES; TITANIUM; BEHAVIOR;
D O I：
10.1016/j.apsusc.2015.03.148
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The objective of this work is to investigate the effects of zirconium-based (Zr) conversion coating on the adhesion properties and corrosion resistance of an epoxy/polyamide coating applied on the aluminium alloy 1050 (AA1050). Field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectrum (EDS), atomic force microscope (AFM) and contact angle measuring device were employed in order to characterize the surface characteristics of the Zr treated AA1050 samples. The epoxy/polyamide coating was applied on the untreated and Zr treated samples. The epoxy coating adhesion to the aluminium substrate was evaluated by pull-off test before and after 30 days immersion in 3.5% w/w NaCl solution. In addition, the electrochemical impedance spectroscopy (EIS) and salt spray tests were employed to characterize the corrosion protection properties of the epoxy coating applied on the AA1050 samples. Results revealed that the surface treatment of AA1050 by zirconium conversion coating resulted in the increase of surface free energy and surface roughness. The dry and recovery (adhesion strength after 30 days immersion in the 3.5 wt% NaCl solution) adhesion strengths of the coatings applied on the Zr treated aluminium samples were greater than untreated sample. In addition, the adhesion loss of the coating applied on the Zr treated aluminium substrate was lower than other samples. Also, the results obtained from EIS and salt spray test clearly revealed that the Zr conversion coating could enhance the corrosion protective performance of the epoxy coating significantly. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：360 / 368
页数：9
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