Method for carrying out room-temperature chemical nickel plating on modified magnesium-based surface with micro-arc oxidation porous membrane

A technology of micro-arc oxidation and electroless nickel plating, which is applied in the direction of liquid chemical plating, anodic oxidation, coating, etc., can solve the problems of decreased stability of the plating solution, affecting the quality of the plating layer, shortening the service life of the plating solution, and increasing the surface area The effect of surface energy, low cost, and less defects such as pores

Inactive Publication Date: 2014-07-02
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a method for micro-arc oxidation porous membrane modified magnesium-based surface room temperature electroless nickel plating, to solve the problem of high temperature of the plating solution during electroless nickel plating on the magnesium-based surface, which leads to a decrease in the stability of the plating solution and self-decomposition , shorten the life of the plating solution, and affect the quality of the coating at the same time

Method used

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  • Method for carrying out room-temperature chemical nickel plating on modified magnesium-based surface with micro-arc oxidation porous membrane
  • Method for carrying out room-temperature chemical nickel plating on modified magnesium-based surface with micro-arc oxidation porous membrane
  • Method for carrying out room-temperature chemical nickel plating on modified magnesium-based surface with micro-arc oxidation porous membrane

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Experimental program
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Embodiment 1

[0038] step 1

[0039] The MAO65-Ⅱ micro-arc oxidation equipment was used, and the constant pressure mode was selected to carry out micro-arc oxidation treatment on magnesium-based substrates. During the treatment process, the AZ91 magnesium alloy plate with a size of 300mm×200mm×10mm was placed in the micro-arc oxidation electrolyte prepared by sodium silicate and deionized water with a concentration of 21g / L, in which the magnesium alloy plate was used as the anode and the cathode was stainless steel Insulation protection between the cathode and anode. The micro-arc oxidation treatment parameters were voltage 420V, frequency 550Hz, duty cycle 19%, and treatment time 15min. Thus, on the magnesium-based surface, such as figure 1 The MAO porous membrane is shown.

[0040] step 2

[0041]The magnesium-based substrate after the micro-arc oxidation treatment in Step 1 was sensitized in a stannous chloride solution with a concentration of 10 g / L for 10 minutes, and then taken o...

Embodiment 2

[0045] step 1

[0046] First prepare the micro-arc oxidation electrolyte, the electrolyte contains sodium fluoride 10g / L, and the solvent is deionized water. Then, the AM60 magnesium alloy wheel plate is placed in the electrolyte for micro-arc oxidation treatment. The process parameters are voltage 470V, frequency 500Hz, duty cycle 6%, and treatment time 5min. Other details of the micro-arc oxidation process are the same as step 1 in the first embodiment.

[0047] step 2

[0048] The sensitizing solution is a 10g / L stannous chloride solution, and all the other steps are the same as step 2 in Example 1.

[0049] step 3

[0050] Prepare an electroless nickel plating solution at room temperature, its composition is nickel sulfate 26g / L, sodium hypophosphite 15g / L, lactic acid 28g / L, pH value about 4.6, using deionized water as solvent. The magnesium-based substrate treated in step 2 is placed in a continuously stirred plating solution for 60 minutes to deposit a nickel layer,...

Embodiment 3

[0052] step 1

[0053] A complex porous micro-arc oxidation film with a mixed distribution of large and small pores was synthesized on the surface of a thin ZK60 magnesium alloy sheet, and the size of the sheet was Ф120mm×4mm. Continue to place the plate in 13g / L sodium phosphate solution for short-time micro-arc oxidation treatment to obtain a local macroporous structure film layer; the micro-arc oxidation treatment parameters are voltage 440V, frequency 500Hz, duty cycle 17%, treatment time 10min . Other process details are the same as in step 1 in the first embodiment. Finally, on the surface of the magnesium alloy, such as image 3 The MAO porous membrane is shown.

[0054] step 2

[0055] The sensitizing solution is a 11g / L stannous chloride solution, and all the other steps are the same as step 2 in Example 1.

[0056] step 3

[0057] First prepare the electroless nickel plating solution at room temperature. The composition of the plating solution is nickel sulfat...

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Abstract

The invention discloses a room-temperature electroless nickel plating method for a magnesium-based surface modified by micro-arc oxidation porous film. First, the micro-arc oxidation porous film on the magnesium-based surface is modified to synthesize a layer of porous film with a pore diameter of several to ten microns. , the existence of the porous membrane significantly increases the surface area and surface energy of the magnesium matrix, and then the electroless nickel plating pretreatment on the surface of the porous membrane is carried out in an ordinary acidic electroless nickel plating solution with sodium hypophosphite as a reducing agent at room temperature Electroless nickel plating at room temperature, the plating temperature is between 20-30°C, which significantly reduces the temperature of the plating solution. The method utilizes the effect of the modified porous film synthesized on the surface of the magnesium base by the micro-arc oxidation technology to realize the electroless nickel plating at room temperature without heating in the ordinary acid plating solution. Due to the difference in the micro-arc oxidation process and the composition of the plating solution, the deposition rate of the nickel plating layer varies between 9-17 μm / h. The method provided by the invention has the advantages of simple technology, convenient operation, low cost and high coating quality.

Description

technical field [0001] The invention belongs to the technical field of metal electroless plating, and relates to a room-temperature electroless nickel-plating method for magnesium alloys in ordinary acid plating solution, in particular to a room-temperature electroless nickel-plating method for a magnesium-based surface modified by micro-arc oxidation porous film. Background technique [0002] Electroless nickel plating can effectively protect the magnesium alloy substrate and significantly enhance its corrosion resistance and other properties, so it can better utilize the advantages of light weight, high specific strength, and good impact resistance of magnesium-based materials, and promote its application in lightweight equipment, biological Applications in many fields such as medical materials. In addition, as a common surface protection technology for magnesium alloys, electroless nickel plating also has the advantages of mature technology and low cost. [0003] Electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36C23C18/18C25D11/30
Inventor 李均明张骞文王爱娟孙海荣袁志龙
Owner XIAN UNIV OF TECH
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