Corrosion Resistance and Cathodic Delamination of an Epoxy/Polyamide Coating on Milled Steel

被引：27
作者：
Ramezanzadeh, B. [1 ]
Khazaei, M. [2 ,3 ]
Rajabi, A. [2 ,3 ]
Heidari, G. [2 ]
Khazaei, D.
机构：
[1] Inst Color Sci & Technol, Dept Surface Coatings & Corros, Tehran, Iran
[2] Amirkabir Univ Technol, Dept Polymer Engn & Color Technol, Tehran, Iran
[3] Saba Shimi Arya Co, Tehran, Iran
来源：
CORROSION | 2014年 / 70卷 / 01期
关键词：
aluminum; cathodic delamination; electrochemical impedance spectroscopy; epoxy; x-ray diffraction; 3.5-PERCENT NACL SOLUTION; EPOXY COATINGS; ZINC-RICH; ELECTROCHEMICAL IMPEDANCE; PROTECTIVE PERFORMANCE; MILD-STEEL; PIGMENTS; ANTICORROSION; NANOPARTICLES; INHIBITION;
D O I：
10.5006/1039
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An epoxy/polyamide coating was reinforced with various loadings of aluminum particles. The coatings were applied on steel panels. The corrosion resistance, cathodic delamination, and surface morphology of the coatings were studied by electrochemical impedance spectroscopy (EIS) (3.5 wt% sodium chloride [NaCl]), a sacrificial Mg anode, optical microscopy, and x-ray diffraction (XRD) techniques, respectively. Results showed that aluminum particles improved corrosion resistance of the epoxy coating significantly. The rate of cathodic delamination of the coating was reduced in the presence of the particles noticeably. The corrosion protection mechanism of the coating was changed using low and high loadings of the particles. The aluminum particles showed active/passive behaviors against the corrosive electrolyte depending on exposure times. The lamellar aluminum particles improved barrier properties of the coating and behaved as a sacrificial pigment at long immersion times. This pigment reduced cathodic activity of the substrate by an aluminum oxide layer formation.
引用
收藏
页码：56 / 65
页数：10
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