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A kind of preparation method of nickel-polytetrafluoroethylene coating

A polytetrafluoroethylene and coating technology is applied in the field of preparation of nickel-polytetrafluoroethylene coatings, which can solve the problems of low matrix bonding force, low oxidation resistance temperature, large friction force, etc. The effect of reducing the coefficient of friction, preventing mold oxidation and

Active Publication Date: 2015-10-28
模德模具(东莞)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of surface coating of mold products, multi-arc ion plating equipment and technology, hollow cathode ion plating equipment and technology are widely used at home and abroad to prepare TiN, AIN, CrN, TiC, TiCN, TiAIN and other coatings because of their low oxidation resistance temperature. , high friction, small bonding force with the substrate, etc., the application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of nickel-polytetrafluoroethylene coating, comprising the following steps:

[0037] A. Preprocessing

[0038] The parts to be plated are polished and polished in sequence, hung up, degreased and degreased, washed with water, activated by pickling, and pre-plated;

[0039] Among them, the surface is ground and polished to a roughness Ra of 0.3-0.5 microns, and the water washing is cleaned in ultrasonic waves with deionized water;

[0040] Pre-plating is that the piece to be plated is put into the pre-plating solution and soaked for 30 minutes, and the pre-plating solution includes nickel powder and polytetrafluoroethylene dispersion calculated by weight percentage;

[0041] The pickling activation is soaking for 12 hours in a hydrochloric acid solution with a volume concentration of 150 ml / liter.

[0042] B. Plating

[0043] Configure the electroplating solution: including 3% of short filament fibers, 30% of nickel chloride, 8% of sodium citrate, ...

Embodiment 2

[0048] With specific implementation 1, the difference is that the configuration of the electroplating solution is to include 2% of short filament fibers, 25% of nickel chloride, 6% of sodium citrate, 25% of nickel sulfate, 10% of polytetrafluoroethylene particles, 3% vinyl fluoride, 2% perfluoroalkyl, 2% propylene copolymer, 0.2% octylphenyl polyoxyethylene powder and ammonia water.

Embodiment 3

[0050] With specific implementation 1, the difference is that the electroplating solution is configured to include 1% of short filament fibers, 20% of nickel chloride, 5% of sodium citrate, 22% of nickel sulfate, 7% of polytetrafluoroethylene particles, Ethylene fluoride 5%, perfluoroalkylate 5%, propylene copolymer 5%, octylphenyl polyoxyethylene powder 0.3% and ammonia water.

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PUM

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Abstract

The invention relates to the technical field of electroplating, and particularly relates to a preparation method of a nickel-polytetrafluoroethylene coating. According to the invention, nickel is combined with polytetrafluoroethylene, a fluorinated ethylene-propylene copolymer, a perfluoroalkoxy copolymer and other assistants to be used as an electroplating solution and used for electroplating under certain conditions. The invention can be widely applied to various base materials such as steel, copper alloys, wrought aluminum, cast iron, stainless steel and the like, and can be also perfectly used on various injection molding materials except pure rubber, such as silica gel, TPO0, PVC (polyvinyl chloride) and the like. The coating is favorable in wear resistance and non-corrosibility, has weldability and hardenability, and causes no negative effect on the surfaces of other molds.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a preparation method of a nickel-polytetrafluoroethylene coating. Background technique [0002] Electroplating is the process of plating a thin layer of other metals or alloys on some metal surfaces by using the principle of electrolysis. During electroplating, the plated metal is used as the anode, which is oxidized into cations and enters the electroplating solution; the metal product to be plated is used as the cathode, and the cations of the plated metal are reduced on the metal surface to form a coating. In order to eliminate the interference of other cations and make the coating uniform and firm, it is necessary to use a solution containing metal cations as the electroplating solution to keep the concentration of metal cations in the coating unchanged. [0003] The purpose of electroplating is to deposit a metal coating (deposit) on the substrate to change the surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00
Inventor 任志同
Owner 模德模具(东莞)有限公司
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