Anticorrosive water-borne paints with reduced phosphate content
The objective of a research was to formulate water-borne epoxy coatings free from zinc and with reduced phosphate levels, replacing zinc phosphate by calcium acid phosphate.
Lanthanum molybdate was incorporated as green anticorrosive pigment to enhance paint anticorrosive performance.
Diminishing phosphate content
Paints were assessed by accelerated (salt spray and humidity chambers) and electrochemical tests (ionic resistance and electrochemical noise). Results suggested that zinc phosphate could be replaced by calcium acid phosphate and the phosphate content in the paint film reduced to one third. Lanthanum molybdate can act synergistically with phosphates.
The study is published in: Progress in Organic Coatings, Volume 112, November 2017, Pages 27-36
Event tip
The European Coatings Seminar Anticorrosive Coatings on 11 October 2017 provides information on surface preperation, coatings ingredients and the current trends in anticorrosive coatings.
