FIELD: metal processing.
SUBSTANCE: invention relates to pretreatment of metal substrates, such as cold rolled steel and electrogalvanised steel. Pretreatment composition for treatment of metal substrates includes a Group IIIB and/or Group IVB metal, free fluoride and lithium, in amount from 5 to 500 parts per million in terms of total weight of pretreatment composition, wherein molar ratio of Group IIIB and/or Group IVB metal to lithium ranges from 100:1 to 1:10, said pretreatment composition basically does not contain a resinous binder component and chromate. Methods include contacting metal substrate with a pretreatment composition.
EFFECT: invention provides improved corrosion resistance of metal substrates without using chromates and/or phosphates.
39 cl, 3 tbl, 2 ex
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