Ni-P-(Cu) composite coatings were applied on a St37 steel in an acidic bath of hypophosphite composite. The effect of the concentration of the Cu particles and pH of the solutionon the amount of Ni an
PROBLEM TO BE SOLVED: To provide a coating device which coats a surface to be coated with a coating liquid, and can fill the coating liquid to the details of defects on the surface to be coated. SOLUT