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

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 chlor...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2014, Vol.70 (1), p.56-65
Main Authors: RAMEZANZADEH, B, KHAZAEI, M, RAJABI, A, HEIDARI, G, KHAZAEI, D
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Aluminum base alloys
Aluminum oxide
Analytical methods
Applied sciences
Cathodic coating (process)
Cathodic protection
Chloride
Coating
Coatings
Corrosion
Corrosion environments
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Delaminating
Delamination
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Electrolytes
Epoxy compounds
Epoxy resins
Exact sciences and technology
Light microscopy
Metals. Metallurgy
Morphology
Nonmetallic coatings
Optical microscopy
Oxide coatings
Particulates
Pigments
Polyamide resins
Polyamides
Production techniques
Protective coatings
Salt
Sodium
Sodium chloride
Spectroscopy
Steel
Submerging
Substrates
Surface treatment
X-ray diffraction
Zinc
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Summary: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.
ISSN:0010-9312
1938-159X
DOI:10.5006/1039