Three generations of inorganic phosphates in solvent and water-borne paints: A synergism case

• Published in: Applied surface science Vol. 252; no. 5; pp. 1386 - 1397
• Main Authors: Blustein, G., Deyá, M.C., Romagnoli, R., Amo, B. del
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.12.2005; Elsevier Science
• Subjects: Coatings; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Corrosion protection; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Phosphate pigments; Physics; Protective layer; Steel passivation; Synergism; Phosphate pigments; Steel passivation; Corrosion protection; Coatings; Protective layer; Synergism; Water; Phosphates; Passivation
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2005.02.096

This research work is intended to compare the anti-corrosive properties of three generations of inorganic phosphate pigments in solvent-based paints and in water-borne ones, both of the epoxy type. The anti-corrosive properties of phosphate pigments were assessed by means of electrochemical techniques (corrosion potential measurements, polarisation tests, etc.), employing a steel electrode dipped into pigments suspensions. The behaviour of these pigments in anti-corrosive paints, formulated with different binders, have been studied by accelerated (salt spray cabinet and humidity chamber) and electrochemical tests (corrosion potential and ionic resistance measurements). Accelerated and electrochemical tests allowed to differentiate the anti-corrosive performance of the three phosphates studied in this research. These test are also able to detect and characterise possible synergism between the water-borne resin and the pigments.