Method for coating ceramic film on metal, electrolysis solution for use in the method, and ceramic film and metal material

A coating method and electrolyte technology, applied in the direction of electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of excellent smooth film, inability to obtain sliding properties, etc., and achieve excellent wear resistance and corrosion resistance. , the effect of low aggression

Inactive Publication Date: 2009-09-02
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] When these methods are used, a coating with a large thickness and excellent corrosion resistance can be produced, but a smooth coating with excellent sliding properties cannot be obtained.

Method used

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  • Method for coating ceramic film on metal, electrolysis solution for use in the method, and ceramic film and metal material
  • Method for coating ceramic film on metal, electrolysis solution for use in the method, and ceramic film and metal material
  • Method for coating ceramic film on metal, electrolysis solution for use in the method, and ceramic film and metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0252] Use surface area 1dm 2 The magnesium die-casting alloy plate (JIS AZ91D material) was used as the working electrode, and the stainless steel plate was used as the counter electrode, and the bipolar electrolysis method was used for 10 minutes of electrolytic treatment to form a film on the surface of the magnesium die-casting alloy plate. When the surface of the working electrode during the electrolytic treatment was observed, light emission due to glow discharge and arc discharge was observed.

[0253] As the electrolytic solution, zirconia particles containing 8.6 g / L ammonium dihydrogen phosphate and 1.2 g / L as zirconia in water (water-dispersed zirconia sol, manufactured by Daiichi Rare Element Chemical Industry Co., Ltd., average particle diameter 0.07 μm, Monoclinic crystal) electrolyte (pH 12.8), which was pH adjusted with ammonia and potassium hydroxide.

[0254] The water-dispersed zirconia sol used in the electrolyte is collected on filter paper, and the cryst...

Embodiment 2

[0258] Use surface area 1dm 2 The magnesium die-casting alloy plate (JIS AZ91D material) was used as the working electrode, and the stainless steel plate was used as the counter electrode, and the bipolar electrolysis method was used for 10 minutes of electrolytic treatment to form a film on the surface of the magnesium die-casting alloy plate. When the surface of the working electrode during the electrolytic treatment was observed, light emission due to glow discharge and arc discharge was observed.

[0259]As the electrolytic solution, zirconia particles containing 8.6 g / L ammonium dihydrogen phosphate and 6 g / L as zirconia in water (water-dispersed zirconia sol, manufactured by Daiichi Rare Element Chemical Industry Co., Ltd., average particle diameter 0.07 μm, single Oblique crystal) electrolyte solution (pH 12.7), its pH was adjusted with ammonia water and sodium hydroxide.

[0260] The conductivity of the electrolyte is 1.8S / m, and the zeta potential is -25mV.

[0261]...

Embodiment 3

[0263] Use surface area 1dm 2 The magnesium die-casting alloy plate (JIS AZ31D material) was used as the working electrode, and the stainless steel plate was used as the counter electrode, and the electrolytic treatment was performed for 5 minutes by the unipolar electrolysis method to form a film on the surface of the magnesium die-casting alloy plate. When the surface of the working electrode during the electrolytic treatment was observed, light emission due to glow discharge and arc discharge was observed.

[0264] As the electrolytic solution, an electrolytic solution (pH 12.5) containing 6 g / L of zirconia particles (water-dispersed zirconia sol, manufactured by Daiichi Rare Element Chemical Industry Co., Ltd., average particle diameter 0.07 μm, monoclinic crystal) as zirconia in water was used. ), and adjusted its pH with ammonia and lithium hydroxide.

[0265] The conductivity of the electrolyte is 1.85S / m, and the zeta potential is -27mV.

[0266] As the voltage wavef...

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Abstract

This invention provides a method for coating a ceramic film on a metal, which can form dense films on various bases of metals such as magnesium alloys. The formed ceramic film has excellent abrasion resistance, causes no significant attack against a counter material, and has excellent corrosion resistance. The method comprises electrolyzing a metallic base in an electrolysis solution using the metallic base as a working electrode while causing glow discharge and / or arc discharge on the surface of the metallic base to form a ceramic film on the surface of the metallic base. The electrolysis solution contains zirconium oxide particles having an average diameter of not more than 1 [mu]m, satisfies the following formulae (1) to (3), and has a pH value of not less than pH 7.0. 0.05 g / L = X = 500 g / L (1) 0 g / L = Y = 500 g / L (2) 0 = Y / X = 10 (3) In the formulae (1) to (3), X represents the content of zirconium oxide particles in the electrolysis solution; and Y represents the content of a compound of at least one element selected from the group consisting of Mg and the like, other than zirconium oxide.

Description

technical field [0001] The present invention relates to a metal ceramic film coating method for electrolytic treatment to form a ceramic film on the surface of a metal substrate, and an electrolytic solution for metal ceramic coating suitable for the method. In addition, the present invention relates to a ceramic coating that can be provided on a metal substrate and a metal material having the ceramic coating. Background technique [0002] In order to impart wear resistance or corrosion resistance to light metal materials such as aluminum alloys and magnesium alloys, a hard coating or a corrosion-resistant coating is formed on the metal by anodizing, electroplating, vapor phase growth, or the like. [0003] For example, as the surface treatment of the aluminum alloy, hard alumina treatment by a low-temperature sulfuric acid bath, nickel plating, or chromium plating can be employed. [0004] On the other hand, when the surface treatment of magnesium alloys is chemical conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/06C25D11/26C25D11/30
CPCH05K1/053C25D11/30C25D11/024C25D11/026C25D11/06C25D11/26C25D15/02C25D11/04
Inventor 吉冈信明山下昌利小西知义
Owner NIHON PARKERIZING
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