Abstract:
A WHITE PAINT FILM APPLIED TO AN IRON OR STEEL SURFACE BY THE ELECTROPHORETIC METHOD OF PAINTING TENDS TO BE OF A MUDDY, OFF-WHITE OR YELLOWISH COLOR; ALSO, FOREIGN DEPOSITS ON THE SURFACE TO BE PAINTED SHOW-UP IN THE WHITE PAINT FILM AS COLOR IMPERFECTIONS. THESE PROBLEMS ARE AVOIDED BY PRETREATING THE IRON OR STEEL SURFACE WITH AN AQUEOUS OLUTION OF COPPE TO APPLY THERETO COPPER DEPOSITS AND THEREAFTER PAINTING THE PRETREATED SURFACE WITH A WHITE PAINT BY THE ELECTROPHORETIC METHOD OF PAINTING.