Method of electrolytic ceramic coating for metal, electrolyte for use in electrolytic ceramic coating for metal, and metal material

A metal material, ceramic coating technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problem that it is difficult to form a dense hard anodic oxide film, and achieve excellent wear resistance and sliding properties, hardness High, excellent toughness effect

Inactive Publication Date: 2007-10-17
NIHON PARKERIZING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in aluminum die-casting alloys, it is difficult to form a dense hard anodized film

Method used

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  • Method of electrolytic ceramic coating for metal, electrolyte for use in electrolytic ceramic coating for metal, and metal material
  • Method of electrolytic ceramic coating for metal, electrolyte for use in electrolytic ceramic coating for metal, and metal material
  • Method of electrolytic ceramic coating for metal, electrolyte for use in electrolytic ceramic coating for metal, and metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] Use surface area 0.12dm 2 An aluminum plate (JIS 1000 series) was used as an anode, and a stainless steel plate was used as a cathode, and electrolytic treatment was performed for 10 minutes by a bipolar electrolysis method to form a film on the surface of the aluminum plate. When the surface of the anode during electrolytic treatment was observed, light emission due to spark discharge and glow discharge was observed.

[0214] As the electrolytic solution, an electrolytic solution (pH 11.7) containing 0.01 mol / L potassium zirconium carbonate, 0.015 mol / L sodium pyrophosphate, and 0.036 mol / L potassium hydroxide in water was used.

[0215] As the voltage waveform, a voltage waveform having a frequency of 60 Hz in which an AC component with an effective value of 300 V was superimposed on a DC component of 300 V was used. The maximum value of the voltage value is about 720V, and the minimum value is about -120V. The current density is about 150A / dm at the positive peak ...

Embodiment 2

[0217] Except using the electrolytic solution (pH11.8) that the potassium hydroxide that contains 0.01mol / L zirconium carbonate in water, the potassium hydroxide that 0.036mol / L obtains as electrolytic solution, carry out electrolytic treatment according to the same method as embodiment 1, in A film is formed on the surface of the aluminum plate. When the surface of the anode during electrolytic treatment was observed, light emission due to spark discharge and glow discharge was observed.

Embodiment 3

[0219] In addition to using an electrolyte (pH 11.6) containing 0.01 mol / L potassium zirconium carbonate, 0.015 mol / L sodium pyrophosphate, 0.036 mol / L potassium hydroxide, and 0.02 mol / L hydrogen peroxide in water Except for the electrolytic solution, electrolytic treatment was performed in the same manner as in Example 1 to form a film on the surface of the aluminum plate. When the surface of the anode during electrolytic treatment was observed, light emission due to spark discharge and glow discharge was observed.

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Abstract

A method of electrolytic ceramic coating for metals, in which there can be obtained a coating film that even when it is thin, exhibits high hardness, excellent abrasion resistance and excellent toughness and that even when applied to a slide material without polishing, has low offensiveness to the mate material. As such a method, there is provided a method of electrolytic ceramic coating for metals, comprising carrying out electrolysis with the use of a metal as a positive electrode in an electrolyte containing a zirconium compound so that a ceramic coating is formed on the surface of the metal.

Description

technical field [0001] The present invention relates to a method for forming a ceramic film on the surface of a metal by electrolytic treatment, and an electrolytic solution for coating electrolytic ceramics on a metal suitable for the method. In addition, the present invention relates to a metal material having a hard coating. Background technique [0002] When a sliding member is made of light metal such as aluminum alloy, in order to impart wear resistance, a hard coating is usually formed on the sliding part by anodizing, plating, vapor phase growth, or the like. Among them, anodic oxidation treatment for forming a wear-resistant coating on a valve metal represented by aluminum is widely used because it is excellent in high followability of the coating, and does not contain chromium, nickel, etc., so that the environmental load is small. [0003] Among them, an anodized film excellent in wear resistance is called a hard anodized film. As the forming method thereof, gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D11/04C25D11/06C25D11/30C04B35/119C04B35/488
CPCC04B2235/786C25D11/30C25D11/04C04B2235/3244C04B2235/3201C04B2235/44C25D11/024C04B2235/963C25D11/026C04B2235/80C04B2235/96C04B2235/449C04B2235/765C04B2235/5445C04B35/119C25D7/10C04B2235/3217C04B35/4885C04B2235/442C25D11/26C25D11/02C04B2235/76C04B2235/447C04B2235/762C25D3/02C25D11/00
Inventor 吉冈信明森和彦奥畑充宏山下昌利池田芳宏
Owner NIHON PARKERIZING
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