| 摘要 |
The invention relates to an aqueous composition and a method for corrosion protective conversion treatment of metal surfaces. The aqueous composition is particularly suitable for the treatment of various metal materials, joined in composite structures, amongst others of steel or galvanised steel or the alloys thereof and any of combination of said materials, the composite structure being at least partly made from aluminium or alloys thereof. According to the invention, the aqueous composition based on a phosphating solution contains in addition to water-soluble compounds of zirconium and titanium an amount of free fluoride in a ratio that permits the phosphatising of the steel and galvanised steel or the alloys thereof and also a low etching rate of the aluminium surface with concomitant passivation of the aluminium surface. The metal materials, components and composite structures subjected to the conversion treatment according to the invention are applicable in automobile chassis production, in ship building, in civil engineering and the production of white goods. ® KIPO & WIPO 2009 |
