Two-step pretreatment system and method

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United States of America Patent

PATENT NO 11725286
APP PUB NO 20200248313A1
SERIAL NO

16639327

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Abstract

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Disclosed is a system for treating a surface of a multi-metal article. The system includes first and second and/or third conversion compositions for contacting at least a portion of the surface. The first conversion composition includes phosphate ions and zinc ions and is substantially free of fluoride. The second conversion composition includes a lanthanide series metal cation and an oxidizing agent. The third conversion composition includes an organophosphate compound, an organophosphonate compound, or combinations thereof that optionally may include at least one transition metal. Methods of treating a multi-metal article using the system also are disclosed. Also disclosed are substrates treated with the system and method.

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Patent Owner(s)

Patent OwnerAddress
PPG INDUSTRIES OHIO INC3800 WEST 143RD STREET CLEVELAND OH 44111

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lemon, Steven J Lower Burrell, US 5 2
Martin, Justin J Irwin, US 16 205
Post, Gordon L Pittsburgh, US 15 30
Sylvester, Kevin T Lawrence, US 12 7
Votruba-Drzal, Peter L Pittsburgh, US 15 16

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