Electrophoresis coating technique for fasteners
An electrophoretic coating and fastener technology, applied in electrolytic coatings, electrophoretic plating, coatings, etc., can solve the problems of high cost, no wear resistance, and no environmental protection, and achieve improved corrosion resistance and suitable friction coefficient. Effect
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[0026] Example 1:
[0027] Adopting process plan 1: The coefficient of friction of the paint film is appropriate and does not affect product assembly; such as: fasteners for engines, gearboxes, and wheels.
[0028] The process steps are:
[0029] 1. Zinc-based phosphating: carried out in a phosphating tank,
[0030] Process parameters: temperature 35±5℃, time 3-5 minutes, keep shaking the sample, washing with water, drying at 80-100℃ for 20 minutes,
[0031] 2. Cathodic electrophoresis: carried out in an electrophoresis tank, the bath temperature is 30±2℃, the electrophoresis time is 2-3 minutes, the coating voltage is 140-180 volts, and it is washed with water.
[0032] 3. Drying: 170-180℃ for 40 minutes;
Example Embodiment
[0033] Example 2:
[0034] Use process plan 2: Except for fasteners with strict torque requirements, it does not affect product assembly; such as: fasteners for connecting brackets.
[0035] The process steps are:
[0036] 1. Electro-galvanizing: the thickness of the plating film is 6-8μm, the temperature of the plating solution is 10-40℃, the plating time is 2-3 minutes, the cathode current density: 0.8-3A / dm 2 ,
[0037] 2. Cathodic electrophoresis: carried out in the electrophoresis tank, the bath temperature is 30±2℃, the electrophoresis time is 2-3 minutes, the coating voltage is 100-140 volts, and it is washed with water.
[0038] 3. Drying: 170-180℃ for 40 minutes;
Example Embodiment
[0039] Example 3:
[0040] Process plan 3: Suitable for fasteners that do not require torque, such as: fasteners for connecting glove boxes inside the cab.
[0041] The process steps are:
[0042] 1. Electro-galvanizing: the thickness of the plating film is 6-8μm, the temperature of the plating solution is 10-40℃, the plating time is 2-3 minutes, the cathode current density: 0.8-3A / dm 2 .
[0043] 2. Zinc-based phosphating: carried out in a phosphating tank,
[0044] Process parameters: temperature 35±5℃, time 3-5 minutes, keep shaking the sample, wash with water, and dry at 80-100℃ for 20 minutes.
[0045] 3. Cathodic electrophoresis: carried out in an electrophoresis tank, the temperature of the tank is 30±2℃, the electrophoresis time is 2-3 minutes, the coating voltage is 140-180 volts, and it is washed with water.
[0046] 4. Drying: Dry at 170-180℃ for 40 minutes.
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