Henkel Ag & Company, Kgaa

Alvaro Bobadilla

Donald Robb Vonk

Bruce H Goodreau

Edis Kapic

Thomas Sullivan Smith, Ii

Michael T Febbraro

Michael Febbraro

Ii Thomas Sullivan Smith

Anti-corrosion metal pretreatment compositions comprising a Group IVB metal, a Group IB metal and polyamidoamine polymers; replenisher compositions for the metal pretreatment compositions; methods of making the metal pretreatment compositions; methods of forming an anti-corrosion Group IVB oxide coating on at least one metal substrate surface by contacting the surface with the metal pretreatment composition; and coated metal substrates having anti-corrosion coatings deposited on the metal substrates from chrome VI free, anti-corrosion metal pretreatment compositions having enhanced corrosion resistance of the Group IVB metal oxide coatings and adhesion of the anti-corrosion and primer coating layers to metal substrates.

Thin corrosion protective coatings incorporating polyamidoamine polymers

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 SiO, 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.

Metal pretreatment composition containing zirconium, copper, zinc and nitrate and related coatings on metal substrates

Metal pretreatment composition containing zirconium, copper, zinc, and nitrate and related coatings on metal substrates

A method of improving corrosion resistance of a metal substrate comprising a zinc surface coated with zirconium oxide conversion coating by, prior to conversion coating, contacting the zinc surface with a composition comprising:

Processes and compositions for improving corrosion performance of zirconium oxide pretreated zinc surfaces

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Royal Oak, MI, United States of America

Alvaro Bobadilla