Autodeposition post-bath rinse process

In a process for autodeposition coating wherein a metal substrate is contacted with an autodeposition bath containing a latex sufficiently long for the resin in said latex to be autodeposited in an uncured state, said uncured resin is then rinsed with an anticorrosive property enhancing substance, and said rinsed uncured resin coating is then cured, the improvement of employing a two-stage rinse by:

• contacting said uncured resin with a first rinse comprising at least one readily water soluble strontium, barium, lead, nickel, ferric, cupric or zinc nonchromate salt in an aqueous solution having a pH of about 4.5 to 8.5, for a time long enough and at a salt concentration high enough, for a precursor anticorrosive effective amount of said at least one salt to be incorporated within said uncured resin;
• and then
• contacting said first rinsed resin with a second rinse comprising an aqueous solution of a water soluble chromate, chromic acid, or chromic acid and partially reduced chromic acid, for a time long enough, and in a concentration high enough, to convert an anticorrosive effective amount of said percursor salt to its corresponding chromate salt in situ.