Method for coating metallic surfaces with a composition that is rich in silane
A metal surface and composition technology, applied in metal material coating technology, anti-corrosion coatings, air transportation, etc., can solve the problems of insufficient corrosion resistance of organic films, difficulty in achieving anti-corrosion protection, etc., and achieve improved strength and/or flexibility , Improve adhesion, paint adhesion improvement effect
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[0240] The examples described below are intended to describe the subject-matter of the invention in more detail.
[0241] A) Compositions mainly based on chelating agents and silanes:
[0242]For the preparation of the aqueous concentrate, at least one partially hydrolyzed silane is aged for at least 2 weeks and optionally hydrolyzed thereby. Subsequently, the metal chelating agent listed in Table 1 was added. Subsequently, this concentrate is diluted with water, optionally with the addition of agents for adjusting the pH, such as ammonia, in order to obtain a ready-to-use treatment solution. In each case, at least 3 pieces of hot-dip galvanized steel or Galvalume The steel plates were contacted with the corresponding treatment solution at 25°C by roll coating and drying. The metal sheets thus treated were dried at 90°C PMT and subsequently tested for their corrosion protection capabilities.
[0243] Examples E1-E8, including Comparative Example CE4, show the effect of...
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