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Method for anodizing magnesium products

Inactive Publication Date: 2007-09-27
HON HAI PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for anodizing magnesium products. The method involves using an electrolyte solution containing a base solution, a blackening agent, and a complexing agent. The substrate material is placed as the anode in the electrolyte and another material is placed as the cathode. Power is then supplied between the anode and cathode until a black coating is formed on the substrate material. The technical effect of this method is the ability to create a durable, protective coating on magnesium products that can withstand corrosion and other environmental factors.

Problems solved by technology

However, the ceramic coating on the magnesium material is white, it needs to be painted when the magnesium material is used in a dark colored product for aesthetic reasons.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Composition of the Electrolyte:

[0017]

sodium hydroxide25g / lsodium silicate1g / lpotassium fluoride10g / lcupric pyrophosphate4g / lnickel nitrate0.1g / lsodium citrate8g / lthiourea1g / l

Temperature of the electrolyte is held at 35° C.;

[0018]Color of the coating formed on the magnesium product: black;

Thickness of the coating formed on the magnesium product: 10 micrometers (μm).

example 2

Composition of the Electrolyte:

[0019]

sodium hydroxide13g / lsodium silicate8g / lpotassium fluoride13g / lcupric pyrophosphate1.8g / lnickel nitrate0.1g / lsodium citrate5g / lthiourea0.1g / l

Temperature of the electrolyte is held at 25° C.;

[0020]Color of the coating formed on the magnesium product: black;

Thickness of the coating formed on the magnesium product: 14 μm.

example 3

Composition of the Electrolyte:

[0021]

potassium hydroxide2g / lsodium silicate35g / lpotassium fluoride1g / lcupric pyrophosphate6g / lnickel nitrate0.1g / ldisodium ethylenediamine tetraacetate3g / lmethenamine0.1g / l

Temperature of the electrolyte is held at 60° C.;

[0022]Color of the coating formed on the magnesium product: reddish black;

Thickness of the coating formed on the magnesium product: 14 μm.

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Abstract

A method for anodizing magnesium products, the method includes the steps of: providing an electrolyte, the electrolyte including a base solution, a blackening agent, and a complexing agent; putting a substrate material as an anode in the electrolyte, and putting another material as a cathode in the electrolyte; and supplying power between the anode and the cathode until a black coating is formed on the substrate material.

Description

CROSS-REFERENCES TO RELATED APPLICATION[0001]Relevant subject matter is disclosed in the co-pending U.S. patent application (Attorney Docket No. US10824) filed on the same date and entitled “ELECTROLYTE FOR ANODIZING MAGNESIUM PRODUCTS”, which is assigned to the same assignee with this patent application.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for anodizing magnesium products.[0004]2. Description of Related Art[0005]Magnesium is widely used in industry because of its low specific gravity, excellent electro magnetic interference (EMI) shielding capability, and adaptability to volume production. Typically, magnesium products require surface treatment, to protect and enhance wearability and inoxidability of their surfaces.[0006]To address aforementioned requirement, the practice of coating magnesium materials with a thin layer is used. China Patent No. 86108405 discloses a method, and an electrolyte for anodizing magnesi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D9/00
CPCC25D11/30
Inventor LUO, ZHONG-WULIN, JUNJIAN, LINPENG, TIE-QIANG
Owner HON HAI PRECISION IND CO LTD