SURFACE TREATMENT COMPOSITION AND SOLUTION FOR LIGHT METALS OR ALLOYS THEREOF AND SURFACE TREATMENT METHOD

摘要

The present invention discloses surface treatment composition for light metals or alloys thereof, which comprises titanium-containing compound, a vanadium-containing compound, and an organic acid. The present invention also provides a surface treatment solution for light metals or alloys thereof, which comprises titanium element in water-soluble form, vanadium element in water-soluble form, an organic acid and water, wherein said organic acid contains 1-100 carbon atoms, 2-50 oxygen atoms. The present invention also provides a surface treatment method for light metals or alloys thereof, which comprises pre-treating light metals or alloys thereof, then contacting with the surface treatment solution of the present invention. The surface treatment solution of the present invention is suitable for a plurality of light metals or alloys thereof to improve their corrosion resistance, coating performance and surface conductivity, is chromium-free formulation, and is easy to formulate and is stable. The surface treatment solution satisfies environment protection requirements, and is characterized by a wide operation application range, easiness in removing its residue, and good industry applicability.