The role of zinc aluminum phosphate anticorrosive pigment in Protective Performance and cathodic disbondment of epoxy coating

• Published in: Corrosion science Vol. 52; no. 4; pp. 1291 - 1296
• Main Authors: Naderi, R., Attar, M.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.04.2010; Elsevier
• Subjects: A. Organic Coatings; A. Steel; Aluminum base alloys; Applied sciences; B. EIS; B. SEM; C. Cathodic Protection; Cathodic coating (process); Cathodic protection; Coating; Corrosion; Corrosion environments; Corrosion prevention; Electrochemical impedance spectroscopy; Exact sciences and technology; Metals. Metallurgy; Nonmetallic coatings; Phosphates; Production techniques; Protective; Surface treatment; Zinc; B. SEM; C. Cathodic Protection; A. Organic Coatings; B. EIS; A. Steel; Cathodic protection; Scanning electron microscopy; Zinc phosphate; Epoxy resin; Metallic pigment; Anticorrosion pigment; Corrosion protection; Non metal coating; Surface treatment; Corrosion; Impedance; Organic compounds
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2009.12.019

Protective performance and cathodic disbondment of epoxy coating pigmented with zinc aluminum phosphate (ZPA) were studied in this work. In solution, superior corrosion inhibition of ZPA extracted from EIS and electrochemical noise data was connected to deposition of a protective layer. EIS evaluation of the pigmented coatings indicated significant effect of modification of zinc phosphate on the protective performance as well as resistance to cathodic disbonding. Compared to ZPA, introduction of zinc phosphate resulted in inferior performance in cathodic disbonding test. In presence of ZPA, precipitation at disbonding front inferred from EIS data was confirmed by SEM.