Hard chrome additive application process, due to the hexavalent chromium layer is easy to passivate (trivalent chromium chromium plating layer in trivalent chromium chromium plating solution passivation is poor; metal chromium passivation coefficient as high as 0.74, second only to aluminum and titanium), therefore, plating is not allowed to be a very short time in the middle of the power outage (the requirements of the workpiece and the hanging device should be elastic contact, the hanging device and the cathode copper rod to ensure that the conductive is good).
Instantaneous power failure, chromium plating layer in the plating solution is also quickly passivated, and then energized in the passivated chromium on the chromium deposition, the plating layer is bound to gray, white flowers, etc. and not bright.
When using chrome plating additives, if the DC power supply used has a large DC ripple coefficient and the waveform is not straight or has residuals, the chrome layer will be passivated (locally) at the trough of the high ripple DC, which will lead to a decrease in the deep plating ability of the plating solution, yellow spots and other defects in the plated layer. Therefore, Bigelow engineers recommend that chrome plating should be done with low ripple DC (DC ripple coefficient less than 5%) when giving production guidance to plating plant customers.
With silicon rectifier, to choose three-phase bridge, six-phase double inverse star with balancing reactor of the kind; if you want to use silicon controlled rectifier or high-frequency switching power supply, it must be the use of inductors with sufficient inductance for filtering.
About us
Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating additives. As a famous electroplating additives source manufacturer in China, Bigely Technology is a national high-tech enterprise with a strong research and development team, which has over 10 engineers with more than 20 years' working experience in the electroplating industry.
If you need our high-quality electroplating additives, please contact us. We can provide you samples for test, and also provide a series of services.
