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AssigneeHenkel AG & Co. KGaA
InventorsDonald VONK, Edis KAPIC, Bruce GOODREAU, Alvaro BOBADILLA
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A pretreatment composition for metal that provides enhanced corrosion resistance, enhanced paint adhesion and reduced chip damage to a wide variety of metal substrates. The pretreatment is also cleaner because it is based on zirconium rather than zinc phosphates. The pretreatment coating composition in use preferably comprises 50 to 300 parts per million (ppm) zirconium, 0 to 100 ppm of SiO2, 150-2000 ppm of total fluorine and 10-100 ppm of free fluorine, 150 to 10000 ppm of zinc and 10 to 10000 ppm of an oxidizing agent and has a pH of 3.0 to 5.0, preferably about 4.0. The coating composition can optionally include 0 to 50 ppm of copper. The suitable oxidizing agents can be selected from a large group.
A metal pretreatment coating composition comprising the following components:
A coated metal substrate comprising a zirconium based conversion coating layer deposited on a metal substrate comprising cold rolled steel, said zirconium based conversion coating layer comprising Zr, Fe, Cu and Zn.
The coated metal substrate according to claim 16 wherein the Zr is present in an amount of 20 atomic % or less and the Zn is present in an amount of at least 0.5 atomic %.
Dependencies are inferred from the claim text.