Aluminum Treatment Composition

Abstract

An aqueous conversion coating composition for treating metal substrates such as aluminum, aluminum alloys, zinc, zinc alloys, magnesium, magnesium alloys and steel to provide a conversion coating thereon. The conversion coating composition comprises a) a source of aluminum ions; b) a fluoro compound; c) at least one pH adjuster; d) a source of Group VIB metal ions selected from the group consisting of tungstate ions and trivalent chromium ions; and e) optionally, a preservative. The conversion coating composition provides a corrosion resistant coating on the metal surface and improves the adhesion of subsequently applied layers.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patent is to offer a better way for protecting metals from corrosion without using harmful hexavalent chromium.

Problems solved by technology

The technical problem addressed in this patent text relates to improving the corrosion resistance of metal alloys, especially those with smoother surfaces that easily form weakly bound surface oxides. This issue arises when trying to prevent rapid corrosion caused by water and other substances. One way to address it is through the use of conversion coatings, but there is room for improvement in terms of providing better results than current methods utilizing hexavalent chromium-containing solutions. Additionally, the effectiveness of conversion coatings depends upon their ability to adhere well to the underlying metal surface and allow for the growth of additional layers for added protection.