Method of improving the corrosion resistance of a metal substrate

An aqueous curable, electrodepositable coating composition prepared by dispersing a resinous phase in an aqueous medium, the resinous phase prepared by combining:

• (1) an ungelled active hydrogen-containing, cationic salt group-containing resin;
• (2) an at least partially blocked polyisocyanate curing agent;
• and
• (3) a pigment component comprising an inorganic, platelike pigment having an average equivalent spherical diameter of at least 0.2 microns,
• wherein the pigment component (3) is incorporated directly into:
• (i) the ungelled active hydrogen-containing, cationic salt group-containing resin (1);
• or
• (ii) the at least partially blocked polyisocyanate curing agent (2);
• or
• (iii) a mixture comprising the ungelled active hydrogen-containing, cationic salt group-containing resin (1) and the at least partially blocked polyisocyanate curing agent (2);
• in each case before dispersing the resinous phase in the aqueous medium.