| abstract |
The present invention comprises a method for treating one or more multi-metal articles. The method comprises exposing the one or more articles to a first treatment composition capable of providing a conversion coating on steel- and zinc- based metal, and exposing the one or more articles to a second treatment coating composition suitable for providing a conversion coating on aluminum-based metal articles. Preferably, the first treatment composition comprises a zinc-phosphate conversion coating comprising, zinc ion, phosphate ion, manganese ion, and fluoride ion. Preferably, the second treatment composition comprises a ceramic composite treatment composition. |