Henkel Ag & Company, Kgaa

Edis Kapic

Bruce H Goodreau

Donald Robb Vonk

Michael L Sienkowski

Alvaro Bobadilla

Jianping Liu

Michael T Febbraro

Todd R Bryden

John L Zimmerman

Jeng-Li Liang

Sophie Cornen

Bruce Goodreau

Michael Sienkowski

Michael Febbraro

John Zimmerman

Alvaro Garcia Bobadilla

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

Methods comprising: (a) providing a coating composition comprising a fluoroacid compound of the general formula (I):XMFO&#x2003;&#x2003;(I)wherein each of q and r independently represents an integer of 1 to 10; each of p and s independently represents an integer from 0 to 10; X represents at least one cation selected from the group consisting of hydrogen, ammonium, alkaline earth metals and alkali metals; and M represents at least one element selected from the group consisting of Ti, Zr, Hf, Si, Sn, Al, Ge, and B; (b) contacting a metal substrate with the coating composition; and (c) adding to the coating composition a component selected from the group consisting of fluorine-free compounds of an element M, Group 2 metal compounds, Group 12 metal compounds, Group 13 compounds, Group 14 compounds, and combination thereof.

Metal treatment coating compositions, methods of treating metals therewith and coated metals prepared using the same

Disclosed is a zirconium-based metal pretreatment coating composition that includes a metal chelator that chelates copper in the metal pretreatment coating composition and thereby improves adhesion of paints to a metal substrate coated with the pretreatment coating composition and the chelating agent is present in a sufficient amount to ensure that in the deposited pretreatment coating on the metal substrate the average total atomic % of copper to atomic % of zirconium is equal to or less than 1.1. The pretreatment coating composition is useful for treating a variety of metal substrates.

Metal pretreatment composition containing zirconium, copper, and metal chelating agents 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

Disclosed is a zirconium-based metal pretreatment coating composition that includes a metal chelator that chelates copper in the metal pretreatment coating composition and thereby improves adhesion of paints to a metal substrate coated with the pretreatment coating composition. The pretreatment coating composition has a longer pot life than one without the metal chelator and therefore can accommodate a wide latitude of application times. The chelating agent is present in a sufficient amount to ensure that in the deposited pretreatment coating on the metal substrate the average total atomic % of copper to atomic % of zirconium is equal to or less than 1.1. The pretreatment coating composition is useful for treating a variety of metal substrates.

The corrosion resistance of a metal substrate surface treated with an acidic aqueous composition to form a conversion coating is improved by first contacting the surface with an oxidizing acidic pre-rinse, such as an aqueous solution of nitric acid and hydrogen peroxide, or nitric acid and hydrofluoric acid, or Fecations and hydrofluoric acid.

Process for treating metal surfaces

A high etch cleaner for aluminum and aluminum alloy substrates that leads to enhanced corrosion protective performance of a variety of anti-corrosion pretreatments. The cleaner comprises low levels of silicate of from 0 to 250 ppm, 50 to 500 ppm of at least one chelator, and has a pH of from 11.0 to 13.5. The cleaner may be used to etch from 0.5 to 4.0 grams per meter squared from substrates. Substrates treated with the cleaner and then coated with a variety of anti-corrosion pretreatments and outer coatings show enhanced corrosion resistance compared to substrates cleaned with standard cleaners that have low etch rates, high silicate levels and no chelating agents followed by anti-corrosion pretreatments and outer coatings.

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Sterling Heights, MI, United States of America

Edis Kapic