A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution
An electrolyte preparation and electrolyte technology, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of vanadium salt heavy metal pollution, poor solution stability, poor film consistency, etc., to reduce processing costs, High blackness value, the effect of avoiding scrapping
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Embodiment 1
[0052] Step 1, add 10g / L sodium hydroxide, 5g / L potassium ferrate, 5g / L potassium fluorotitanate, 9g / L potassium fluoride, 30g / L sodium hexametaphosphate, 10g / L B Glycol, 150g / L hexamethylenetetramine, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;
[0053] Step 2. Put the AZ91D magnesium alloy computer keyboard (with an area of 6dm 2 ) placed in HF with a volume fraction of 15%, H with a volume fraction of 5% 2 SO 4 The cleaning time in the pretreatment solution for pickling is 0.5min, and then washed with water;
[0054] Step 3. Place the AZ91D magnesium alloy computer keyboard treated in step 2 in the pre-treatment solution for alkali washing with a concentration of 30g / L trisodium phosphate and 30g / L sodium carbonate. The temperature is controlled at 80°C, and the cleaning time is 5min, and then wash;
[0055] Step 4. Place the AZ91D magnesium alloy computer keyboard processed in step 3 in the prepared electrolyte, connect the m...
Embodiment 2
[0058] Step 1. Add 10g / L sodium hydroxide, 10g / L sodium ferrate, 1g / L potassium fluotitanate, 10g / L sodium fluoride, 20g / L ammonium dihydrogen phosphate, 20g / L Propanol, 200g / L aminotriethanol, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;
[0059] Step 2. Place the AZ31D magnesium alloy computer case (with an area of 12dm 2 ) into 8% (volume fraction) HF, 6% (volume fraction) HNO 3 The cleaning time in the pretreatment solution for pickling is 0.2min, and then washed with water;
[0060] Step 3. Put the AZ31D magnesium alloy computer case treated in step 2 into 60g / L sodium hydroxide, control the temperature at 60°C, and wash it for 3 minutes, then wash it with water;
[0061] Step 4. Put the AZ31D magnesium alloy computer case processed in step 3 into the prepared electrolyte, connect the AZ31D magnesium alloy computer case to the anode of the equipment, and use stainless steel as the cathode. After connecting the power supply, per...
Embodiment 3
[0064] Step 1. Add 12g / L potassium hydroxide, 20g / L potassium ferrate, 2g / L sodium fluorotitanate, 10g / L potassium fluoride, 12g / L trisodium phosphate, 15g / L trisodium phosphate to deionized water in sequence Alcohol, 300g / L hexylidene diamine, obtain electrolyte; Electrolyte is fully stirred 30min at room temperature, stand-by;
[0065] Step 2, AZ31B magnesium alloy (area is 5dm 2 ) into 10% (volume fraction) HF, 5% (volume fraction) HNO 3 The cleaning time in the pre-pickling treatment solution is 1min, and then washed with water;
[0066] Step 3, put the AZ31B magnesium alloy treated in step 2 into the cleaning solution of 40g / L sodium carbonate and 10g / L sodium hydroxide, control the temperature at 85°C, wash for 4min, and then wash with water;
[0067] Step 4. Place the AZ31B magnesium alloy treated in step 3 in the prepared electrolyte, connect the AZ31B magnesium alloy to the anode of the equipment, and use stainless steel as the cathode. After connecting to the power...
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