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Electroplating metal fastener and its electroplating process and hydrogen embrittlement detection method

A technology for metal fasteners and electroplating metal, which is applied in threaded fasteners, connecting components, measuring devices, etc., and can solve the problem of no hydrogen embrittlement detection method.

Inactive Publication Date: 2007-07-11
杨东佐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, there is no detection method for hydrogen embrittlement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An electroplated metal fastener with copper plating, nickel plating and zinc plating in sequence on the surface of the metal base of the screw. The thickness of the copper plating layer is 0.5, the thickness of the nickel plating layer is 2um and the thickness of the zinc plating layer is 10um.

[0024] An electroplating process for electroplating screws, the process steps are electroplating copper, electroplating nickel and electrogalvanizing in sequence. The solution composition and process conditions of the electroplating nickel process are: sodium hydroxide 80mg / L, nickel chloride 10mg / L, sodium lauryl sulfate 10ml / L, current density 2 / dm 2 , the anode is stainless steel, the temperature is 60C; the solution composition and process conditions of the electrogalvanizing process are: sodium hydroxide 70 / L, zinc oxide 20mg / L, ethylenediamine 20ml / L, triethanolamine 10ml / L, current density 0.2A / dm 2 , the anode is stainless steel, and the temperature is 12°C. The solu...

Embodiment 2

[0028] An electroplated metal fastener is provided with copper plating, nickel plating and zinc plating in sequence on the surface of the metal base of the screw. The thickness of the copper plating layer is 1.3um, the thickness of the nickel plating layer is 1.3um and the thickness of the zinc plating layer is 12um.

[0029] An electroplating process for electroplating screws, the process steps are electroplating copper, electroplating nickel and electrogalvanizing in sequence. The solution composition and process conditions of the electroplating nickel process are: sodium hydroxide 100mg / L, nickel chloride 18mg / L, sodium lauryl sulfate 20ml / L, and current density 4A / dm 2 , the anode is stainless steel, and the temperature is 70°C; the solution composition and process conditions of the electro-galvanizing process are: sodium hydroxide 110mg / L, zinc oxide 35mg / L, ethylenediamine 35ml / L, triethanolamine 40ml / L, current The density is 2A / dm 2 , the anode is stainless steel, an...

Embodiment 3

[0033] An electroplated metal fastener is provided with copper plating, nickel plating and zinc plating in sequence on the surface of the metal base of the screw. The thickness of the copper plating layer is 2um, the thickness of the nickel plating layer is 0.5um and the thickness of the zinc plating layer is 14um.

[0034] An electroplating process for electroplating studs, the process steps are electroplating copper, electroplating nickel and electrogalvanizing in sequence. The solution composition and process conditions of the electroplating nickel process are: sodium hydroxide 120mg / L, nickel chloride 25mg / L, sodium dodecylbenzenesulfonate 30ml / L, current density 5A / dm 2 , the anode is stainless steel, and the temperature is 80°C; the solution composition and process conditions of the electro-galvanizing process are: sodium hydroxide 150mg / L, zinc oxide 48mg / L, ethylenediamine 48ml / L, triethanolamine 70ml / L, current The density is 3.8A / dm 2 , the anode is stainless steel...

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Abstract

The invention discloses a plating metal fastener, which comprises the following steps: plating copper, nickel and zinc; sleeving metal fastener in the elastic pad; rotating metal fastener in the ferric board hole with two thirds force as standard torque until fastening tightly; placing tested screw in the refrigerator at -5 deg. c for 24h; fetching to restore to normal temperature; dropping ferric board vertically from one meter height; judging whether the end breaks; satisfying the standard if not breaking.

Description

technical field [0001] The invention relates to an electroplated metal fastener, its electroplating process and a detection method for hydrogen embrittlement. 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,...

Claims

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Application Information

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IPC IPC(8): C25D5/12F16B23/00F16B25/00G01N3/00
Inventor 杨东佐
Owner 杨东佐
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