AQUEOUS BINDER COMPOSITION FOR METAL SURFACE TREATMENT AGENTS

摘要

The present invention provides an aqueous binder composition for chromate-free metal surface treatment agents that have excellent coatability and liquid stability and are capable of forming a surface treatment film having excellent corrosion resistance, adhesiveness and electrical conductivity. This aqueous binder composition for metal surface treatment agents contains: a reaction product of a silane coupling agent containing an amino group and a silane coupling agent containing an epoxy group, or a reaction product of the above-described silane coupling agents and an alkoxysilane compound such as trialkoxysilane wherein a hydrocarbon group such as an alkyl group is directly bonded to a silicon atom; a specific acid compound; and water.