Surface protection process for copper, aluminium alloy, steel-cored nickel coin and medal

A technology of aluminum alloy and steel core, applied in the direction of coins, electrophoretic plating, clothing, etc., can solve the problem of copper coins, stamp discoloration, environmental pollution equipment investment, process stability and appearance effect, affecting copper, aluminum alloy, steel core nickel plating Coins, medals ornamental effect and quality and other issues, to achieve the effect of improving corrosion resistance and avoiding oxidation and corrosion

Active Publication Date: 2005-09-14
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the collection and storage of copper, aluminum alloy, and steel core nickel-plated coins and stamps, it is often found that copper coins and stamps are seriously discolored, and aluminum and steel core plated nickel coins and stamps are oxidized to varying degrees, which affects the copper, aluminum alloy, and steel coins. The Ornamental Effect and Quality of Core Plated Nickel Coins and Medals
At present, there is no domestic process for protecting the surface of copper, aluminum alloy, and steel core nickel-plated coins and chapters. There are reports abroad of spraying wax and burning titanium coatings through UV lasers. However, due to environmental pollution, equipment investment, and process stability It has not been adopted in China due to various reasons such as performance and appearance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put the 104 pieces of Φ19mm aluminum coin hanger into the ultrasonic cleaning tank. The temperature of the ultrasonic bath is 51-52 ℃. The oil stains and surface fingerprints that may exist in the fine patterns on the surface are removed by ultrasonic waves. The cleaning time is 80S, and then enter the spraying tank, clean the surface by atomization and spraying, the cleaning time is 30S, and then rinse with pure water with a conductivity of less than 2us / cm at room temperature, and the rinse time is 60S. After cleaning the surface, it enters the cathodic electrophoresis tank. Pure water with a conductivity less than 5us / cm is prepared at a weight percentage of 1:5, and the solid content in the electrophoresis tank is controlled at 10%, pH3.7, acidity 19, conductivity 300us / cm, bath temperature 25-26°C, electrophoresis The time is 60S, the surface area is 5.89dm 2 , the electrophoresis voltage of aluminum coins is 30 volts, and the thickness of the electrophoretic paint...

Embodiment 2

[0031] Put steel core nickel-plated coins Φ25mm, 112 pieces of fixtures into the ultrasonic cleaning tank, control the temperature of the ultrasonic tank liquid at 48-50 ℃, remove the oil stains and surface fingerprints that may exist in the fine patterns on the surface through ultrasonic waves, the cleaning time is 90S, and then Enter the spray tank, clean the surface by atomization and spraying, the cleaning time is 30S, and then rinse with pure water with a conductivity of less than 2us / cm at room temperature, and the rinsing time is 60S. Acrylic resin and pure water with a conductivity of less than 5us / cm are prepared in a ratio of 1:5 by weight, and the solid content in the electrophoresis tank is controlled at 9.8%, pH4.0, acidity 20, conductivity 270us / cm, bath temperature 25-26 ℃, electrophoresis time is 60S, surface area is 10.99dm 2 , the electrophoretic voltage of nickel-plated steel core coins is 32 volts, and the thickness of the electrophoretic paint film is cont...

Embodiment 3

[0033] Put 112 copper medals with a diameter of 45mm on the hanger, enter the ultrasonic cleaning tank, control the temperature of the ultrasonic tank liquid at 53-54°C, and remove the oil stains and surface fingerprints that may exist in the fine patterns on the surface through ultrasonic waves. The cleaning time is 100S, then enter the spray tank, clean the surface by atomization and spraying, the cleaning time is 30S, and then rinse with clean water at room temperature, the rinsing time is 40S, after cleaning the surface, enter the electrolytic degreasing tank, the main technical parameters of electrolytic degreasing are as follows: The bath temperature is 45-46°C, the oil removal time is 60S, and the current density is 6-7A / dm 2 , The degreasing liquid is prepared by 45g / L sodium carbonate, 30g / L trisodium phosphate, 0.5g / L sodium lauryl sulfate, 2g / L sodium edetate, further degreasing, and then enters the spray Tank, clean the surface by atomization and spraying, the clea...

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Abstract

The invention discloses the surface protection technology for copper, aluminum alloy, steel core and nickel plated coin and seal. The feature is that: hanging the coin or seal, removing oil by ultrasonic, the first pulverization spraying washing, rinsing, cathode electrophoresis, the second pulverization spraying washing, the first counter-flow wash, the second counter-flow wash, drying by hot air, light fixed drying and taking down the product. The invention uses the method of cleaning the surface of metal and uniform distributing the film of amino third diluted acid colophony formed by cathode electrophoresis and light fixing on the surface of the metal. Thus, the surface of the metal would be effectively protected.

Description

Technical field: [0001] The invention belongs to the technical field of coinage anti-corrosion protection, and in particular relates to a coin or badge surface protection process to delay and prevent copper, aluminum alloy, steel core nickel-plated coins, badge oxidation and discoloration. Background technique: [0002] During the collection and storage of copper, aluminum alloy, and steel core nickel-plated coins and stamps, it is often found that copper coins and stamps are seriously discolored, and aluminum and steel core plated nickel coins and stamps are oxidized to varying degrees, which affects the copper, aluminum alloy, and steel core. The ornamental effect and quality of nickel-plated coins and chapters. At present, there is no domestic process for protecting the surface of copper, aluminum alloy, and steel core nickel-plated coins and stamps. There are reports abroad of spraying wax and burning titanium coatings through UV lasers. However, due to environmental pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A44C21/00C25D13/12C25D13/20
Inventor 张勃
Owner CHINA BANKNOTE PRINTING & MINTING
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