what is a chromate
Noun. 1. chromate-any salt or ester of chromic acid. lead chromate-a poisonous chromate of lead used as a pigment in paint. salt-a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal).ead chromate-a poisonous chromate of lead used as a pigment in paint. salt-a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal).