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Magnesium and magnesium alloy high corrosion resitance composite cladding and its preparing process

A technology of composite coating and preparation process, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., which can solve the problems of poor corrosion resistance and achieve the effect of good corrosion resistance

Inactive Publication Date: 2005-02-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at the shortcomings of poor corrosion resistance of existing magnesium alloy coatings, to provide a composite coating with high corrosion resistance of magnesium and magnesium alloys and its preparation process, the thickness of the coating is not more than 35 microns, and the coating is resistant to neutral salt spray The time can reach more than 1000 hours

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The magnesium alloy AZ91 casting is plated for 2 hours by an electroless plating process, and the thickness of the plating layer obtained is 25 microns, and the phosphorus content of the electroless nickel plating layer is about 9%. Then electroplate zinc-nickel alloy according to the following formula and process: 15% sodium hydroxide, 5% zinc oxide, 3% nickel chloride, 4% ethylenediamine, 4% triethanolamine, 0.5% potassium sodium tartrate, DE0.8% , 0.03% sodium dodecyl sulfate, and the balance is water. The current density is 2.5A / dm 2 , plating time is 30 minutes. The anode is made of stainless steel plate, and the temperature is room temperature. The obtained zinc-nickel alloy coating has a thickness of 8-10 microns and a nickel content of about 15%. The final coating is black passivated. The total thickness of the coating is about 35 microns.

[0017] The neutral salt spray test is carried out according to the ASTM B117 standard, and the durability time can re...

Embodiment 2

[0019] Magnesium alloy AZ91 castings were plated for 1.4 hours by electroless plating process to obtain a coating thickness of 20 microns, and the phosphorus content of the electroless nickel plating layer was about 9%. Then electroplate zinc-nickel alloy according to the following formula and process: sodium hydroxide 8%, zinc oxide 2%, nickel chloride 0.5%, ethylenediamine 2%, triethanolamine 2%, potassium sodium tartrate 3%, DE0.2% , 0.01% sodium dodecylsulfonate, and the balance is water. The current density is 2.5A / dm 2 , the anode is made of stainless steel plate, and the temperature is room temperature. The electroplating time is 30 minutes, and the obtained zinc-nickel alloy coating has a thickness of 8-10 microns and a nickel content of about 13%. The final coating is black passivated. The total thickness of the coating is about 30 microns.

[0020] The neutral salt spray test is carried out according to the ASTM B117 standard, and the durability time can reach 80...

Embodiment 3

[0022] The magnesium alloy AZ91 casting is plated for 2 hours by an electroless plating process, and the thickness of the plating layer obtained is 25 microns, and the phosphorus content of the electroless nickel plating layer is about 9%. Then electroplate zinc-nickel alloy according to the following formula and process: sodium hydroxide 12%, zinc oxide 4%, nickel chloride 1.5%, ethylenediamine 3%, triethanolamine 3%, potassium sodium tartrate 1.5%, DE0.4% , 0.03% sodium dodecyl sulfate, and the balance is water. The current density is 2.5A / dm 2 , plating time is 30 minutes. The anode is made of stainless steel plate, and the temperature is room temperature. The obtained zinc-nickel alloy coating has a thickness of 8-10 microns and a nickel content of about 16%. The final coating is black passivated. The total thickness of the coating is about 35 microns.

[0023] The neutral salt spray test is carried out according to the ASTM B117 standard, and the durability time can ...

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Abstract

The inventions are sorts of magnesium, magnesium alloy which is compound plating coat of high anti corrosion, and their preparation technics. Compound plating coat based on the chemical nickel coat, the thickness of which is between 20 and 25 micron. The callow of it is electrolytic zinc plating and nickel alloy, the thickness of which is between 8 and 10 micron. The following is the preparation craftwork: the chemical nickel plating of magnesium alloy adopts the standard B480-88 of American material experimentation association. Plating time is between 1.4 and 2 hours. The coating thickness is between 20 and 25 micron. The content of phosphor in the plating layer is 9-12%; electrolytic zinc plating and nickel alloy: the plating liquid of it and technics conditions are followed: sodium hydroxide 8-15%, zinc oxide 2-5%, nickelous chloride 0.5-3%, ethylamine 2-4%, tiethanolamine 2-4%, nylander reagent 0.5-3%, DE0.2-0.8%, sodium dodecanesulphonate 0.01-0.1%, the overmeasure is water. Curl density is 0.5-5A / dm2. Plating time is 30 minutes. The content of nickel in the plating coat is 13-18%; It adopts black passivation technics of zinc and nickel alloy. The thickness of plating coat of this invention doesn't exceed 35 micron.

Description

technical field [0001] The invention relates to a metal composite coating and a preparation process thereof, in particular to a magnesium and magnesium alloy high corrosion resistance composite coating and a preparation process thereof. It is used in the field of surface treatment of non-ferrous metal materials. Background technique [0002] Magnesium alloy is the lightest metal structure material in practical application. It has the advantages of small specific gravity, high specific strength and specific stiffness, good damping, machinability and casting performance. It is widely used in the fields of automobiles, machinery, aerospace and portable electronic instruments, Computers, hand tools, and camera components are increasingly being used. But the corrosion resistance of magnesium alloy is very poor. Several surface coatings that have been developed, such as chemical plating or electroplating, have limited corrosion protection effects. Even if it is an electroless c...

Claims

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Application Information

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IPC IPC(8): C23C28/04
CPCC23C18/1653C23C28/021C23C18/36C25D3/565C23C28/02C23C28/025
Inventor 刘新宽胡文彬丁文江向阳辉
Owner SHANGHAI JIAO TONG UNIV
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