Anticorrosive water borne paints free from zinc and with reduced phosphate content

摘要

Highlights?The use of calcium acid phosphate in anticorrosive paints allows diminishing phosphate content.?Lanthanum molybdate was successfully incorporated in anticorrosive paint formulation.?Lanthanum molybdate acted synergistically with calcium acid phosphate.?Electrochemical noise method was employed to study paint performance.AbstractThe objective of this 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 a green anticorrosive pigment to enhance paint anticorrosive performance. 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.]]>