Follow-up with good adhesion sink zinc corrosion

1. Process characteristics: good adhesion follow sink zinc corrosion resistance is required another sink zinc trace qing supporting the use of the substance. It can produce a dense and uniform surface sink zinc thin layer of aluminum, for the follow-up process of direct copper, nickel, tin, electroless nickel plating to provide good adhesion. Particularly suitable for aluminum wheel plating. 2. The solution composition and operating conditions: raw materials and operating conditions standard amount ranging from open tank water 450 ml / liter 400-450 ml / l with good adhesion follow sink zinc corrosion 550 ml / liter 550-600 ml / l temperature 16 -30 ℃ 21-24 ℃ Time 20-120 seconds 20-120 seconds PH 12.8-13.6 3. solution maintenance: low load applications can be used directly corrosion resistance of aluminum sink zinc supplement, each increase of 1.0 g / liter of hydroxide sodium, may be added to 5.5 ml / liter corrosion resistance of aluminum sink zinc. Without added 1 liter of solution can be treated workpiece 2.46 m2. High load applications (such as aluminum wheel plating) available sink zinc supplements C and B respectively metal component and adjust alkalinity. According gravity of the solution added: can be added to 4.5% (volume) or 2.5% (by volume) sink zinc supplements B and 2.5% (by volume) C supplements to increase the proportion of 0.01 units. The equipment needs projects require tank PP, PVC or PE high density rack PP, PVC or 316 stainless steel air mixing does not need to have a moderate, uniform stirring pep cycle takes 3-4 filtration system requires continuous loop filter ventilation needs Cooling system needs heating system needs