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Surface color treatment of alloys with micro-arc oxidation process

A surface treatment, aluminum alloy surface technology, applied in the field of micro-arc oxidation treatment process, can solve the problems of inefficiency, undesired color and dissatisfaction on the treated surface

Inactive Publication Date: 2017-12-05
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manufacturers are generally dissatisfied with the MAO process because it produces undesired tints on the treated surface
Recent methods attempt to modify surface color, but require additional processes that are inefficient and time-consuming

Method used

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  • Surface color treatment of alloys with micro-arc oxidation process
  • Surface color treatment of alloys with micro-arc oxidation process
  • Surface color treatment of alloys with micro-arc oxidation process

Examples

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example 1

[0027] Example 1: Black MAO treatment on aluminum alloy

[0028] Samples made from commercial grade aluminum alloy 7075 were used in these experiments. By way of example, Figure 6A Table 600 in shows the chemical composition of aluminum alloy 7075. In one example embodiment, those skilled in the art will appreciate that other aluminum alloys comprising at least 90% aluminum will also be suitable for use in these experiments.

[0029] Aluminum alloy samples were treated using the micro-arc oxidation (MAO) method. First, the electrolyte for MAO treatment was prepared by dissolving 10–30 g / L silicate and 3–6 g / L hydroxide into deionized (DI) water in a stainless steel bath. Subsequently, an additive of 8-40 g / L tungstate is added to the electrolyte. With 0.03-0.17A / cm 2 A current with a current density and a pulse frequency of 500-2600 Hz is applied to the aluminum alloy immersed in the electrolyte for a period of 100-720 seconds. A chemically and mechanically protective a...

example 2

[0042] Example 2: Black MAO treatment on magnesium alloy

[0043] Specimens made from commercial grade magnesium alloys AZ31B or AZ91D were used in these experiments. By way of example, Figure 6B Table 602 in shows the chemical composition of magnesium alloy AZ31B and magnesium alloy AZ91D. In one example embodiment, those skilled in the art will appreciate that other magnesium alloys comprising at least 90% magnesium will also be suitable for use in these experiments.

[0044] Magnesium alloy samples were processed using the MAO method. First, the electrolyte for MAO treatment was prepared by dissolving 20–30 g / L silicate, 5–20 g / L phosphate, and 3–6 g / L hydroxide into DI water in a stainless steel bath. Subsequently, add 5-10g / L glycerin, 0.5-2g / L tungstate and 5-15g / L TiO 2 Nanoparticles are added to the electrolyte. By way of example, the added TiO 2 The nanoparticles are rutile titanium dioxide with a particle size of 30 nm. With 0.03-0.17A / cm 2 A current with a ...

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Abstract

Example embodiments include methods of treating a surface of an aluminum (Al) alloy or magnesium (Mg) with an electrolyte to obtain a surface with a coloration that is uniformly enhanced. Example embodiments also include surface-treated Al alloy or Mg alloy made by the example methods.

Description

technical field [0001] The invention relates to a micro-arc oxidation (MAO) treatment process for coloring the surface of magnesium (Mg) alloy and / or aluminum (Al) alloy. Background technique [0002] Micro-arc oxidation (MAO) treatment is promising and effective to form thick ceramic layers with good adhesion to the substrate, which is also environmentally friendly and cost-effective. However, manufacturers are generally dissatisfied with the MAO process because it produces undesired tints on the treated surface. Recent methods attempt to modify surface color, but require additional processes that are inefficient and time-consuming. [0003] Therefore, it is necessary to provide a surface color treatment method using MAO technology on alloys. Contents of the invention [0004] An example embodiment is a method for treating the surface of an aluminum (Al) alloy, which includes: immersing the aluminum alloy in an electrolyte solution; 2 A current with a current density a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14C25D11/06C25D11/30
CPCC25D11/024C25D11/026C25D11/06C25D11/14C25D11/30C22C21/10C22C23/02
Inventor 陶宏苏敬豪李思越金秋
Owner NANO & ADVANCED MATERIALS INST
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