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aluminum flake is used in a wide variety of industrial applications including automotive, marine, and architectural coatings. These coatings are often required to withstand harsh environments that include extreme temperature fluctuations, UV exposure, and chemical attack from salt, acids and alkalis. The successful performance of these coatings depends on the ability of the coating to protect the underlying metal substrate from corrosion. aluminum flakes have proven to be an effective means of achieving this.
aluminum flakes are used in a wide range of powder coatings to provide a metallic effect in a variety of colors and finishes. These flakes are also incorporated into clear topcoats for automobile and industrial coatings to ensure long life and durability. Because they are so versatile, these flakes can be found in many different forms and are available from a large number of suppliers.
In addition to the well-known benefits of aluminum, these flakes are highly recyclable. In fact, almost all of the world’s recycled aluminum comes from these flakes. However, these flakes can be prone to oxidation and discoloration in harsh environments and require protection from these effects.
This invention provides thin plane-parallel aluminum flakes with an inner layer of oxidized aluminum having a thickness of 0.5-30 nm, and processes for their manufacture and use, especially in paints, electrostatic coatings, printing inks, plastics materials, and cosmetics. These metallized pigments exhibit improved shear stability as shown by the difference in lightness L* (according to CIELab system) before and after shear stress, which is significantly lower than that of comparable non-degrading aluminum flakes belonging to the state of the art.