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
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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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