Anodized aluminum with dark gray color

An aluminum sheet, aluminum alloy technology, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve problems such as increasing the production cost of non-ferrous alloys

Active Publication Date: 2019-04-16
NOVELIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional color anodized alloys are colored by additional absorption or electrolytic coloring methods, which increases the production cost of colored alloys relative to uncolored alloys

Method used

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  • Anodized aluminum with dark gray color
  • Anodized aluminum with dark gray color
  • Anodized aluminum with dark gray color

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Alloy flakes of the present invention and three kinds of comparative alloy flakes were prepared, the compositions of which are detailed in Table 1. By casting the ingot at about 650°C, homogenizing the ingot at 525°C for a soaking time of less than 1 hour, hot rolling the homogenized ingot at 250-450°C for 10 minutes to produce a hot-rolled intermediate product, and at 150- The hot-rolled intermediate product was cold-rolled at 180° C. for 10 minutes to produce a cold-rolled intermediate product to prepare a sheet.

[0070] Table 1. Composition of alloying elements, total impurities up to 0.15% by weight, balance aluminum.

[0071]

Embodiment 2

[0073] Aluminum flakes of Alloy 4 described in Example 1 and Comparative Alloys 1 and 2 were imaged with a scanning transmission electron microscope (STEM). Figure 1A with Figure 1B STEM images of Comparative Alloy 1 and Comparative Alloy 2, respectively. Figure 1C is the STEM image of Alloy 4. Alloy 4 exhibits a much higher dispersoid density than the comparative alloy. Alloy 3 has a lower dispersoid density than Alloys 1 and 2 and is therefore not shown.

Embodiment 3

[0075] Sheets of Comparative Alloys 1 and 2 and Alloy 4 prepared as described in Example 1 were alkaline etched with 10% sodium hydroxide solution and anodized to a 10 micrometer (μm) anodized layer thickness. The resulting cross-section of the anodized layer was imaged with a high-resolution scanning electron microscope (SEM). The SEM images of comparative alloys 1 and 2 and alloy 4 are shown in Figures 2A-2C . Such as Figure 2A As shown in, in these example alloys, the fine particles are Al 6 Fe and Mg 2 Si. The anodized aluminum flakes of Alloy 4 had a significantly darker gray color with many dispersoids visible (see Figure 2C ), while the two comparison anodized aluminum alloy flakes have light gray and less dispersoids (see Figure 2A-2B ).

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Abstract

Provided herein are aluminum alloys and aluminum sheets including alloys that have a natural dark gray color when anodized. The alloys do not require any absorptive or electrolytic coloration processseparate from the anodization process to achieve the dark gray coloration. Also provided herein are methods for making such aluminum alloys.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 375,932, filed August 17, 2016, which is hereby incorporated by reference in its entirety. technical field [0003] Anodized aluminum alloy sheets, in particular dark gray anodized aluminum alloy sheets, are described herein. Background technique [0004] Dark gray is a desired property in certain anodized aluminum products such as anodized quality ("AQ") structural sheets. The anodizing process is an electrochemical process that converts the surface of an aluminum alloy into aluminum oxide. Because the aluminum oxide is formed in place on the surface, it is fully integrated with the underlying aluminum substrate. The surface oxide layer produced by anodizing is a highly ordered structure that, when pure, can be transparent and colorless, giving the anodized sheet a shiny light gray color. The surface oxide layer is also porous and is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C25D11/14C22C21/06
CPCC22C21/06C22F1/04C25D11/16C22C21/08C22F1/047C25D11/04C25D15/00C25D11/14
Inventor D.姜M.弗兰克S.巴克D.马瑟
Owner NOVELIS INC
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