TWO-STEP PRETREATMENT SYSTEM AND METHOD
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Aug 14, 2017
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Aug 12, 2016
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Disclosed is a system for treating a surface of a multi-metal article. The system includes first and second compositions for contacting at least a portion of the surface. The first composition includes phosphate ions and zinc ions and is substantially free of fluoride. The second composition includes a lanthanide series metal cation and an oxidizing agent. 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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