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Method for preparing nickel content gradually varying zinc-nickel alloy plating on surfaces of steel and iron parts through pulse plating

A zinc-nickel alloy and pulse electroplating technology, which is applied in the field of surface treatment of steel parts and metal materials, can solve the problems of insufficient bonding force and corrosion resistance to meet the needs, and achieve improved production safety, convenient operation, and high comprehensive performance. Effect

Inactive Publication Date: 2014-05-21
WUXI SANZHOU COLD ROLLED SILICON STEEL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the zinc-nickel coating provided by the above method cannot meet the requirements in some practical applications in terms of bonding force and corrosion resistance, and a coating with better performance is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: the steel plate that surface is coated with zinc-nickel alloy nano film

[0019] The specific steps are: before the steel plate is electroplated, the parts are polished and washed with water, degreased, then washed with water, rust removed, put into the electroplating bath after washing, and the electrolyte is stirred or left standing, After electrolysis, the parts are taken out from the electrolytic solution, washed with water, and dried. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 25 minutes.

[0020] The electroplating power supply mode is output pulse power supply, and the specific parameters are: the current density is continuously and gradually reduced from the initial 8A / dm2 to 1A / dm2; the frequency is continuously and gradually reduced from the initial 1500Hz to 400Hz ;The duty cycle decreases gradually from the initial 0.5 to 0.05. The temperature is room temperature. The electrolyt...

Embodiment 2

[0021] Embodiment 2: the surface is coated with the nut of zinc-nickel alloy nano film

[0022] The surface electroplating method of the nut comprises that the nut is polished and washed with water and degreased before the electroplating, then washed with water, derusted, put into the electroplating solution of the electroplating tank after being washed with water, and the electrolytic solution is stirred Or let it stand still, and after electrolysis, take out the parts from the electrolyte, wash them with water, and dry them. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 20 minutes.

[0023] The electroplating power supply mode is output pulse power supply, and the specific parameters are: the current density is continuously and gradually reduced from the initial 8A / dm2 to 2A / dm2; the frequency is continuously and gradually reduced from the initial 1500Hz to 500Hz ; The duty cycle decreases continuously and gradu...

Embodiment 3

[0025] Embodiment 3: The inner liner of the pump chamber coated with zinc-nickel alloy nano-multilayer film on the surface.

[0026] The surface electroplating method of the pump chamber lining comprises: before the pump chamber lining is electroplated, the parts are polished and washed with water, degreased, then washed with water, rust removed, put into the electroplating tank electroplating solution after being washed with water, and The electrolytic solution is stirred or left to stand, and after electrolysis, parts are taken out of the electrolytic solution, washed with water, and dried. The pH value of the plating solution is 3.5, and the power supply mode for plating is pulse power supply for 30 minutes.

[0027] The electroplating power supply mode is output pulse power supply, and the specific parameters are: the current density is continuously and gradually reduced from the initial 9A / dm2 to 2A / dm2; the frequency is continuously and gradually reduced from the initial...

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Abstract

The invention relates to a method for preparing nickel content gradually varying zinc-nickel alloy plating on surfaces of steel and iron parts through pulse plating. The method is characterized in that output pulse power supply is adopted as the plating power supply mode; the current density, the frequency and the duty cycle are continuously and gradually reduced. The plating of the steel and iron parts with plating on the surfaces is zinc-nickel alloy nano-film plating, the nickel content in the plating is continuously and gradually increased from the sides close to a matrix to the surfaces and the nickel contents of the zinc-nickel alloy nano-film surfaces are close to 13%. Wonderful binding forces are provided as the nickel contents are continuously and gradually increased, the zinc-nickel alloys with nickel contents of 13% on the surface layers have wonderful corrosion resistance and the formed whole has high hardness, corrosion resistance, wear resistance, high-temperature oxidation resistance and high compactness and decorative property (appearance) due to continuous variation of the nickel content, thus obtaining the zinc-nickel alloy nano-film plating with excellent comprehensive properties.

Description

technical field [0001] The invention relates to a pulse electroplating preparation method of a zinc-nickel alloy coating with gradually changing nickel content on the surface of iron and steel parts, belonging to the technical field of surface treatment of iron and steel parts and metal materials. Background technique [0002] Corrosion and anti-corrosion are related to economic development and people's life safety. Surface engineering technology is the most economical and effective means and method to solve the corrosion and protection of mechanical parts and materials. With the rapid development of modern industry and science and technology, the performance requirements for mechanical parts and material surfaces are getting higher and higher, and surface treatment technology has also developed rapidly. Surface engineering technology can use chemical, physical or electrochemical methods to treat the surface of parts or materials to form various protective layers on the surf...

Claims

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Application Information

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IPC IPC(8): C25D5/18C25D3/56
Inventor 刘茂见
Owner WUXI SANZHOU COLD ROLLED SILICON STEEL
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