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Electroplating process of electroplated metal fastener

An electroplating process and a technology of electroplating metal, which are applied in the field of electroplating technology, can solve the problems of slow electroplating deposition speed and weak bonding of electroplating layers, and achieve the effects of fast electroplating deposition speed, strong corrosion resistance, and firm bonding of electroplating layers

Inactive Publication Date: 2013-06-26
LIUZHOU YUHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The application number is 200610124172.5, the publication number is the Chinese invention patent of CN1995474 and has provided a kind of electroplating process of electroplating metal fasteners, and its electroplating process steps are electroplating copper, electroplating nickel and electrogalvanizing successively, although solved the problem of hydrogen embrittlement phenomenon Occurs, but it has defects such as weak bonding of the electroplating layer and slow electroplating deposition speed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Electroplated Metal Fasteners

[0023] Copper-plated, nickel-plated and zinc-plated on the surface of the metal base of the screw in sequence, the steps are as follows:

[0024] (1) Solution composition and process conditions of copper electroplating process: copper sulfate 135 mg / L, malic acid 90 mg / L, citric acid 210 mg / L, potassium citrate 40 mg / L, sodium hypophosphite 20 mg / L, Glucose 15 mg / L; current density 1.5A / dm 2 , the anode is 3‰ phosphorus-containing copper plate, the area ratio of anode and cathode is 2:1, the temperature is 20-25°C, and the time is 8 minutes;

[0025] (2) Solution composition and process conditions of electroplating nickel process: sodium hydroxide 100mg / L, nickel chloride 15mg / L, sodium chloride 60mg / L, phosphorous acid 85mg / L, succinic acid 40mg / L, methylol Acrylic acid 110mg / L, boric acid 175mg / L, sodium dodecylbenzenesulfonate 20mg / L; current density is 3A / dm 2 , the anode is made of stainless steel, the temperature is 70°...

Embodiment 2

[0030] Example 2 Electroplated Metal Fasteners

[0031] Copper-plated, nickel-plated and zinc-plated on the surface of the metal base of the screw in sequence, the steps are as follows:

[0032](1) Solution composition and process conditions of copper electroplating process: copper sulfate 120mg / L, malic acid 100 mg / L, citric acid 200 mg / L, potassium citrate 50 mg / L, sodium hypophosphite 10mg / L, glucose 20 mg / L; the current density is 1A / dm 2 , the anode is 3‰ phosphorus-containing copper plate, the area ratio of anode and cathode is 2:1, the temperature is 25°C, and the time is 10 minutes;

[0033] (2) Solution composition and process conditions of electroplating nickel process: sodium hydroxide 80mg / L, nickel chloride 25mg / L, sodium chloride 50mg / L, phosphorous acid 90mg / L, succinic acid 30mg / L, methylol Acrylic acid 120mg / L, boric acid 150mg / L, sodium dodecylbenzenesulfonate 30mg / L; current density is 2A / dm 2 , the anode is made of stainless steel, the temperature is 80°...

Embodiment 3

[0038] Example 3 Electroplated Metal Fasteners

[0039] Copper-plated, nickel-plated and zinc-plated on the surface of the metal base of the screw in sequence, the steps are as follows:

[0040] (1) Solution composition and process conditions of copper electroplating process: copper sulfate 150 mg / L, malic acid 80 mg / L, citric acid 220 mg / L, potassium citrate 30 mg / L, sodium hypophosphite 30 mg / L, Glucose 10 mg / L; current density 2A / dm 2 , the anode is 3‰ phosphorus-containing copper plate, the area ratio of anode and cathode is 2:1, the temperature is 20°C, and the time is 8 minutes;

[0041] (2) Solution composition and process conditions of electroplating nickel process: sodium hydroxide 120mg / L, nickel chloride 10mg / L, sodium chloride 70mg / L, phosphorous acid 80mg / L, succinic acid 50mg / L, methylol Acrylic acid 100mg / L, boric acid 200mg / L, sodium dodecylbenzenesulfonate 10mg / L; current density is 5A / dm 2 , the anode is made of stainless steel, the temperature is 60°C, an...

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Abstract

The invention discloses an electroplating process of an electroplated metal fastener. The electroplating process comprises the steps of copper electroplating, nickel electroplating and zinc electroplating in sequence, specially as follows: (1) preparing the solution for the copper electroplating process: 135mg / L of copper sulfate, 90mg / L of malic acid, 210mg / L of citric acid, 40mg / L of potassium citrate, 20mg / L of sodium hypophosphite, and 15mg / L of glucose, wherein the process conditions are as follows: the current density is 1.5A / dm<2>, an anode is of a 0.3%-phosphorus-containing copper plate, the area ratio of the anode to the cathode is 2:1, the temperature is 20-25 DEG C and the time lasts for 8 minutes; (2) electroplating nickel; and (3) electroplating zinc. By adopting the electroplating process, the problem of hydrogen embrittlement can be solved; the electroplated copper, the electroplated nickel and the electroplated zinc all adopt specific solution, the electroplated layer has no burr and is less rough, the surfaces of the electroplated layers can not produce pin holes, the phenomenon of leaking electroplating can not occur, the electroplated layers are combined more firmly, the electroplating deposition velocity is fast, and the corrosion resistance property is stronger.

Description

technical field [0001] The invention relates to an electroplating process for electroplating metal fasteners. Background technique [0002] The corrosion of metal is a ubiquitous problem. To solve the corrosion of metal, the most common method at present is to adopt the way of surface coating. The method to solve the corrosion of metal fasteners such as screws and studs is generally to adopt the method of galvanizing the surface of screws, studs, etc. Galvanizing directly on the surface of metal fasteners such as screws and studs is prone to hydrogen embrittlement. Hydrogen embrittlement can cause metal fasteners such as galvanized screws and studs to break after being locked for a period of time or vibrating after locking. Hydrogen embrittlement refers to metal fasteners such as screws and studs hanging on the cathode during the electrogalvanizing process. In addition to depositing zinc on the cathode during electroplating, part of hydrogen is also precipitated, and some...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25D3/12C25D3/22C25D5/12
Inventor 韦筠寰
Owner LIUZHOU YUHUA TECH
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