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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 liquid chemical plating, anodic oxidation, coating, etc., can solve the problems of decreased stability of the plating solution, shortening the life of the plating solution, and affecting the quality of the plating layer, so as to increase the surface area The effect of less defects such as surface energy and pores, and low cost

Inactive Publication Date: 2012-12-05
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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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 method for carrying out room-temperature chemical nickel plating on a modified magnesium-based surface with a micro-arc oxidation porous membrane. The method comprises the following steps of: first, carrying out modification treatment on the micro-arc oxidation porous membrane of the magnesium-based surface to synthesize a porous membrane with an aperture from several microns to below twenty microns, wherein the surface area and the surface energy of a magnesium matrix are obviously increased due to the existence of the porous membrane, and then, carrying out the chemical nickel plating pretreatment of the surface of the porous membrane, and finally, carrying out the room-temperature chemical nickel plating at a room temperature in an ordinary acidic chemical nickel plating solution using sodium hypophosphite as a reducing agent, wherein a plating temperature is between 20 DEG C and 30 DEG C, and the temperature of the plating solution is obviously reduced. By using the method, the heating-free room-temperature chemical nickel plating in the ordinary acidic plating solution is realized by utilizing the effect of a micro-arc oxidation technology on the modified porous membrane synthesized on the magnesium-based surface. Due to the difference between a micro-arc oxidation process and the components of the plating solution, the deposition velocity of a nickel plating layer is between 9 mum / h and 17 mum / h and is unequal. The method provided by the invention is simple in technology, low is cost and high in plating layer quality, and is convenient to operate.

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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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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