Micro-arc oxidation pretreatment method before chemical nickel-plating of titanium alloy

A technology of micro-arc oxidation and electroless nickel plating, which is applied in liquid chemical plating, metal material coating process, electrolytic coating, etc., to achieve the effect of high hardness, excellent corrosion resistance, and complete nickel plating film

Inactive Publication Date: 2010-12-15
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the most widely used micro-arc oxidation technology is to form micro-arc oxidation ceramic films on magnesium, aluminum, and titanium alloys. Generally, t...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: (1) chemical degreasing: remove the chemical degreasing formula of test piece surface oil stain:

[0014] Sodium hydroxide (NaOH) 60~80g / L

[0015] Sodium phosphate (Na 3 PO 4 12H 2 O) 20~40g / L

[0016] Sodium carbonate (Na 2 CO 3 ) 20~40g / L

[0017] Sodium silicate (Na 2 SiO 3 ) 3~10g / L

[0018] Temperature 70~90℃

[0019] time until

[0020] After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there is no water drop and no infiltration, it is considered that the degreasing is qualified.

[0021] (2) Micro-arc oxidation: Titanium wire is used to make the required shape of the fixture to ensure good contact between the fixture and the test piece during the micro-arc oxidation process. During micro-arc oxidation, because the temperature of the spark discharge bath is easy to rise, the bath temperat...

Embodiment 2

[0025] Embodiment two: (1) chemical degreasing: remove the chemical degreasing formula of test piece surface oil stain:

[0026] Sodium hydroxide (NaOH) 60~80g / L

[0027] Sodium phosphate (Na 3 PO 4 12H 2 O) 20~40g / L

[0028] Sodium carbonate (Na 2 CO 3 ) 20~40g / L

[0029] Sodium silicate (Na 2 SiO 3 ) 3~10g / L

[0030] Temperature 70~90℃

[0031] time until

[0032] After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there are no water droplets and non-wetting parts, it is considered that the degreasing is qualified;

[0033](2) Micro-arc oxidation: Titanium wire is used to make the required shape of the fixture to ensure good contact between the fixture and the test piece during the micro-arc oxidation process. During micro-arc oxidation, because the temperature of the spark discharge solution is easy to rise, the tem...

Embodiment 3

[0037] Embodiment three: (1) chemical degreasing: remove the chemical degreasing formula of test piece surface oil stain:

[0038] Sodium hydroxide (NaOH) 60~80g / L

[0039] Sodium phosphate (Na 3 PO 4 12H 2 O) 20~40g / L

[0040] Sodium carbonate (Na 2 CO 3 ) 20~40g / L

[0041] Sodium silicate (Na 2 SiO 3 ) 3~10g / L

[0042] Temperature 70~90℃

[0043] time until

[0044] After the parts are degreased, they are thoroughly washed with water, and then the continuity of the water film on the surface of the parts is checked. If the surface of the whole part is hydrophilic, there are no water drops and non-wetting parts, it is considered that the degreasing is qualified;

[0045] (2) Micro-arc oxidation: Titanium wire is used to make the required shape of the fixture to ensure good contact between the fixture and the test piece during the micro-arc oxidation process. During micro-arc oxidation, because the temperature of the spark discharge bath is easy to rise, the bath te...

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PUM

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Abstract

The invention discloses a micro-arc oxidation pretreatment method before chemical nickel-plating of a titanium alloy. The pretreatment method is characterized by introducing a micro-arc oxidation process before an activation process, so that the titanium alloy with a micro-arc oxidation film on the surface is subjected to post-activation chemical nickel-plating. The pretreatment method comprises the following steps of: (1) performing chemical oil removal; (2) performing micro-arc oxidation; (3) performing activation; (4) performing chemical nickel-plating; and (5) performing post-treatment. The pretreatment method has the advantage that: a high-performance chemical nickel-plating film with strong binding force, high hardness and high corrosion resistance can be obtained on the surface of the titanium alloy.

Description

technical field [0001] The invention relates to a pretreatment method for electroless nickel plating on titanium alloys, in particular to a pretreatment method using micro-arc oxidation as the pretreatment method for electroless nickel plating on titanium alloys. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance and thermal stability, etc., and can work at a high temperature of 500-600 °C for a long time without losing its original mechanical properties. It not only replaces Aluminum alloys, magnesium alloys and steel components have been widely used, and they have also been widely used in advanced aircraft. In addition to a large number of applications in the aviation field, titanium alloys are also increasingly used in daily life, such as in biomedicine, auto parts, and electronics industries. However, the wear resistance, electrical and thermal conductivity, and weldability of titanium and ti...

Claims

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Application Information

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IPC IPC(8): C23C18/36C23C18/18C25D11/26
Inventor 赵晴陈庆龙刘刚
Owner NANCHANG HANGKONG UNIVERSITY
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