The most important thing about alkaline zinc plating additives is the performance parameters. To determine whether the additive is useful, it is necessary to perform performance tests on it.
Author: Marisa
There are many brands of alkaline zinc plating additives on the market, with uneven product quality and a wide range of prices. So are expensive alkaline zinc plating additives good to use? Not necessarily.
The most important thing about alkaline zinc plating additives is the performance parameters. To determine whether the additives are good to use, it is necessary to test their performance. The performance of the additives can be tested from these four aspects:
1. Test of current density range. Add alkaline zinc plating additives to a 250ml Hull cell, at 25°C, for 10 minutes, and continuously adjust the current size to test the current density range of the brightener.
2. Temperature range test. Use additives at different temperatures to conduct Hull cell experiments, and observe the appearance and brightness of the film to determine the appropriate temperature range of the additives.
3. Test of all-plating ability. Conduct a Hull cell experiment at 25°C, add the standard amount of additives, measure the thickness of the test piece at 1.5cm and 8.5cm from the distance zone, and find the thickness ratio of the high and low zones. The thickness ratio of additives with good all-plating ability is below 2.0.
4. Test of depth ability. Bend the copper sheet into a cylinder with an inner diameter of 1.5 cm and a length of 10 cm at 25°C for a single anode test, with the cylinder placed parallel to the anode. The percentage of the bright area and semi-bright area of the copper sheet to the entire coating area is used to indicate the depth capability.
Therefore, the alkaline zinc plating additive should not be expensive, but should be good.