Light metal anodization

A technology of anodizing and light metal, applied in the direction of anodizing, etc., can solve problems such as shortage, harmful substances, hindering industrial application, etc.

Inactive Publication Date: 2005-01-12
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although anodization of aluminum, magnesium, and their alloys can form a more effective protective coating than paint and glazing, the resulting plated metals are still not fully satisfactory for their intended use
The coating often lacks the desired degree of hardness, smoothness, durability, bonding, heat resistance, corrosion resistance, and / or impermeability required to meet the most demanding industrial requirements
Furthermore, many light metal anodizing processes that have been developed so far have serious disadvantages which hamper their industrial applications
For example some methods require the use of high voltages, long anodizing times and / or volatile, hazardous substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0034] The anodizing solution was prepared using the ingredients shown in Table 1, and the pH of the solution was adjusted to 8.0 using ammonia water (5.4 g of concentrated ammonia water was required in Example 1).

[0035] The anodizing solution of Example 2 was used to anodize a 1″×4″ AZ91 magnesium alloy sample. When 60 Hz AC was applied at 88 V (peak voltage controlled by VARIAC voltage controller) 7-9 amps, a green visible luminescent discharge was observed. After 5 minutes of anodizing, a 0.07 mil thick coating was formed. With pulsed square wave DC (approximate shape, 10 microseconds on and 30 microseconds off, minimum voltage 0), the discharge is periodic and white. The average voltage was 30 volts (average peak voltage = 200 volts with an instantaneous peak of 300 volts). The rate of coating formation (typically, 0.2 to 0.4 mils in 2 minutes) was much higher than when using 60 Hz AC.

[0036] Example

[0037] 1 VERSENE 100, a product of Dow Chemical Comp...

Embodiment 3

[0039] Use 10g / L of sodium fluorosilicate (Na 2 SiF 6 ) to prepare an anodizing solution, and adjust the pH of the solution to 9.7 using KOH. A magnesium-containing article was anodized in the anodizing solution for 45 seconds using pulsed direct current with a maximum ceiling voltage of 440 volts (approximate average voltage = 190 volts). The on-time was 10 microseconds and the off-time was 10 microseconds (the "break" or baseline voltage was 50% of the maximum ceiling voltage). A uniform coating with a thickness of 3.6 microns was formed on the surface of the magnesium-containing article. During anodizing, the plasma generated is initially continuous, but then becomes periodic.

Embodiment 4

[0041] A magnesium-containing article was anodized in the anodizing solution of Example 3 for 45 seconds using pulsed direct current with a maximum ceiling voltage of 500 volts (approximate average voltage = 75 volts). The on-time is 10 microseconds and the off-time is 30 microseconds (the "break" or baseline voltage is 0% of the highest ceiling voltage). A uniform coating with a thickness of 5.6 microns was formed on the surface of the magnesium-containing article. During anodizing, the plasma generated is initially continuous, but then becomes periodic.

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Abstract

Using aqueous electrolytes containing complex fluorides or oxyfluorides such as fluorozirconates, fluorotitanates, and fluorosilicates, articles containing light metals such as magnesium and aluminium may be rapidly anodized to form protective surface coatings. White coatings may be formed on aluminium articles using pulsed direct current or alternating current. When the article to be anodized is comprised of magnesium, pulsed direct current having a relatively low average voltage is preferably used.

Description

[0001] This application is a continuation-in-part of Ser. No. 10 / 162,965, filed June 5, 2002, which is a continuation-in-part, of Ser. No. 10 / 033,554, filed October 19, 2001, which is a 2001 Continuation in part of application Ser. No. 09 / 968,023 filed October 2. field of invention [0002] This invention relates to the anodizing of light metals such as magnesium and aluminum to provide corrosion, heat and wear resistant coatings. The invention is particularly useful for forming white anodized coatings on aluminum substrates. Background of the invention [0003] Magnesium, aluminum and their alloys have found various industrial applications. However, due to the reactivity of these light metals and their propensity for corrosion and environmental degradation, it is necessary to provide an adequate corrosion-resistant and protective coating to the exposed surfaces of these metals. In addition, such coatings should be abrasion resistant so that the coating remains intact duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/06C25D11/30
CPCC25D11/30C25D11/06
Inventor S·E·度兰
Owner HENKEL KGAA
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