The coated metal substrates and preparation procedures and the associated corrosion inhibition.

A metal substrate coated unphosphated consisting of: (a) a substrate unphosphated metal; (B) a first pretreatment composition deposited upon at least a portion of the substrate, the first pretreatment composition comprising a material containing a transition element selected from said transition element of the group consisting of Group IIIB elements, Group IVB, elements of the lanthanide series and mixtures thereof; (C) a second pretreatment composition is the reaction product of at least one epoxy functional material or derivative thereof and at least one material selected from the group consisting of materials containing phosphorus-containing materials amine ; sulfur-containing materials and mixtures thereof deposited upon at least a portion of the first pretreatment composition; and (d) an electrodepositable coating composition lead deposited on the second pretreatment composition.