Nickel pre-coating process and nickel pre-coating solution for magnesium alloy surface
A technology of pre-plating nickel and magnesium alloys, which is applied in hot-dip plating process, metal material coating process, superimposed layer plating, etc. simple effect
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Example Embodiment
[0037] Example 1
[0038] The test material is AZ91D magnesium alloy
[0039] 1. Polishing
[0040] The surface of the magnesium alloy workpiece is treated to a bright surface by mechanical polishing.
[0041] 2. Organic solvent degreasing
[0042] Wash with acetone solvent for 10 minutes under the action of ultrasonic, and the operating temperature is room temperature.
[0043] 3. Alkaline washing and degreasing
[0044] Sodium hydroxide (NaOH) 50g·dm -3 , Sodium phosphate (Na 3 PO 4 ·12H 2 O)10g·dm -3 , Temperature: 60±5℃, time: 8-10min;
[0045] 4. Acid attack
[0046] Oxalic acid (C 2 H 4 O 2 )10g·dm -3 , Sodium lauryl sulfate (C 12 H 25 SO 3 Na), 0.1g·dm -3 , Room temperature.
[0047] 5. Alkaline activation
[0048] Potassium pyrophosphate (K 4 P 2 O 7 )40g·dm -3 , Potassium fluoride (KF) 5g·dm -3, 75°C, 1min.
[0049] 6. Dip galvanizing
[0050] Zinc Sulfate ZnSO 4 50g·dm -3 , Potassium pyrophosphate (K 4 P 2 O 7 )150g·dm -3 , Sodium carbonate (Na 2 CO 3 )g·dm -3 , Fluorinate...
Example Embodiment
[0056] Example 2
[0057] The test material is AZ91D magnesium alloy
[0058] The test procedure is the same as in Example 1. The pre-nickel plating formula and process conditions are: nickel sulfate 25g·dm -3 , Ammonium citrate ((NH 4 ) 3 C 6 H 5 O 7 )2.5g·dm -3 , Ammonium bifluoride (NH 4 HF 2 )35g·dm -3 , Ammonia (NH 3 ·H 2 O)45cm 3 ·Dm -3 , PH: 4.5-5.5, temperature: 45-55℃, time: 30min, cathode current density: 2A·dm -2 , Air stirring, continuous filtration.
Example Embodiment
[0059] Example 3
[0060] The test material is AZ91D magnesium alloy
[0061] The test procedure is the same as in Example 1. The pre-nickel plating formula and process conditions are: its formula and process conditions are: nickel sulfate (NiSO 4 ·6H 2 O)200g·dm -3 , Ammonium citrate ((NH 4 ) 3 C 6 H 5 O 7 )15g·dm -3 , Ammonium bifluoride (NH 4 HF 2 )25g·dm -3 , Ammonia (NH 3 ·H 2 O)35cm 3 ·Dm -3 , PH: 4.5-5.5, temperature: 45-55℃, time: 6min, cathode current density: 10A·dm -2 , Air stirring, continuous filtration.
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