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Plated switch contact and preparing method thereof

A switch contact, gold-plated layer technology, applied in the direction of contacts, electric switches, liquid chemical plating, etc., can solve the problems of short contact jitter time, long contact jitter time, poor arc resistance, etc.

Active Publication Date: 2014-10-22
NANTONG MEMTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the first invention: to overcome the disadvantages of copper-based, silver-based, nickel-based or stainless steel contacts, which have low cost but poor arc resistance, poor chemical stability, and long contact jitter time, and provide a kind of conduction performance Good, arc ablation resistance, gold-plated switch contacts with short contact bounce time

Method used

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  • Plated switch contact and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] like figure 1As shown, this product has a three-layer structure: rubber layer 1, metal sheet layer 2, and gold-plated layer 3. The metal base material is a zinc white copper sheet with a thickness of 0.1mm, a HV hardness of 120 to 180, and a copper content of about 55%. . The smooth zinc-nickel-nickel copper sheet is rolled into a fine corrugated sheet by mechanical method, the peak height of the corrugation is 0.1mm, and the peak distance is 0.2mm. Then use an alkaline cleaning solution with a pH value of about 9 to clean and remove oil, wash with water, and then use industrial alcohol to clean and remove oil, then use 12.5% ​​sulfuric acid solution to wash at a temperature of 50 to 80°C for 2 minutes, wash with water, and then , on both sides of the zinc-nickel-nickel copper fine corrugated sheet, use an electroless nickel plating solution containing nickel sulfate and sodium hypophosphite to plate a nickel layer with a thickness of about 2.5 microns. Electroless ni...

Embodiment 2

[0062] The metal foil substrate used was the same as in Example 1. The clean fine corrugated zinc white copper sheet is directly compounded with silicone rubber to form a 1.0mm thick sheet, and then the sheet is punched into small round particles with a diameter of 3.0mm. This small round particle is coated with a layer of 2.5 μm thick nickel, and then the above-mentioned small round particle coated with nickel is plated with gold according to the method of embodiment 1. The prepared gold-plated grains are used as contacts of rubber keys, and have good arc ablation resistance and contact vibration resistance.

Embodiment 3

[0064] The small round grain before gold-plating is the same as embodiment 1. The electroless gold plating solution used is cyanide-free, and its chemical composition is: potassium gold chloride 2.0 g / L, disodium EDTA 20 g / L, potassium citrate 5.0 g / L, sodium lactate 5.0 g / L, thio Sodium sulfate 15g / L, sodium sulfite 15g / L, thiourea 20g / L, sodium tungstate 0.2g / L. Ammonia water is added in an appropriate amount, and the pH value is adjusted to 8.5-9.5 with ammonia water. The bath temperature is 60°C. The electroless plating time is 45 minutes. The contact made in this way also has better performance of arc ablation resistance and contact vibration resistance.

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Abstract

The invention discloses a plated switch contact and a preparing method thereof. The switch contact is a combined body with a three-layer structure, the first layer is a hydrophobic rubber layer, the second layer is a sheet metal layer, the third layer is a plated layer, and a combination body of the first layer and the second layer is soaked in a chemical plating solution with a soluble gold compound and gold or gold alloy is selectively deposited on the surface of sheet metal in the combination body by a chemical deposit method to form the plated layer. According to the plated switch contact and the preparing method thereof, the prepared switch contact is suitable for heat vulcanization bonding and forming with rubber, and thereby, a rubber press key with the switch contact can be produced. The switch contact has the advantages that the resistance to atmospheric corrosion, contact chatter and arc erosion is good, the surface contact resistance is low, the service life is long, and the like.

Description

technical field [0001] The invention specifically relates to a switch in an electric or electronic product or a component (that is, an electrical contact or a contact point) through which current can pass through contact between two conductors in a circuit and a preparation method thereof. Background technique [0002] Electric contacts or contacts are important components that allow current to pass through contact between two conductors in a switch or circuit. They undertake the functions of connecting, carrying and breaking normal currents and fault currents. Their quality and service life are directly related to It determines the quality and service life of the entire switch or circuit. Electrical contacts or contacts are mainly used in relays, contactors, air switches, current limiting switches, motor protectors, micro switches, instruments, computer keyboards, handhelds, household appliances, automotive appliances (window switches, rearview mirrors) switch, light switc...

Claims

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Application Information

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IPC IPC(8): H01H1/021H01H11/04C23C18/42
CPCH01H1/021
Inventor 韩辉升王振兴张红梅丁阳邬国强
Owner NANTONG MEMTECH TECH
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