Methods for electrolytically depositing pretreatment compositions

A method for treating a substrate comprising:

• deoxidizing at least a portion of the substrate;
• contacting at least a portion of the substrate that has been deoxidized with a spontaneously depositable pretreatment composition comprising a Group IIIB metal and/or a Group IVB metal, wherein the spontaneously depositable pretreatment composition is capable of reacting with and chemically altering the substrate surface and binding to it to form a protective layer in the absence of an externally applied voltage;
• and
• then passing electric current between an anode and the substrate that has been contacted with the spontaneously depositable pretreatment composition, serving as a cathode, said cathode and anode being immersed in an electrodepositable pretreatment composition comprising a lanthanide series metal and/or a Group IIIB metal, an oxidizing agent, a metal-complexing agent and a surfactant, to deposit a coating from the electrodepositable pretreatment composition onto a surface of the substrate, wherein the surfactant is present in an amount of 0.001% to 5.0% of the electrodepositable pretreatment composition weight, and wherein the electrodepositable pretreatment composition is capable of reacting with and chemically altering the substrate surface and binding to it to form a protective layer upon the introduction of an externally applied voltage.