1. Before using the platinum-titanium electrode, the presence of “fluorine” ions in the plating solution should be excluded (must be detected). It is confirmed that there is no chemical composition of the platinum-titanium electrode, and the platinum-titanium electrode can be safely used. Otherwise, the substrate at the bottom of the platinum-titanium electrode will be severely corroded, the platinum layer will fall off, and the service life will be shortened. Do not use the hard chromium additive and the fluoride-containing recycled industrial chromic anhydride.
2. Reasonable selection of the best process, the anode current density is preferably 50A/dm2, and the tank voltage is below 10V, otherwise the service life will be affected, which will cause the anode to melt and the platinum layer to fall off. Try to choose the process of anodizing without solid oxide formation, and avoid the effect of oxide thickening and passivation on the anode.
The reason for the breakdown of the anode is determined by the inherent characteristics of the titanium material. When the cell voltage is greater than 11 V, the surface of the titanium in contact with the platinum layer begins to be slightly soluble, and the breakdown at 12 volts is completely broken. After the breakdown, the groove pressure we saw could not show 12V, only about 11V. At this point, the current has not been added and the anode is destroyed. So we set the safe use tank voltage below 10V.
3. In principle, the surface area of the plated cathode should be smaller than the effective anode area (ie, the area of the anode below the liquid surface), and the anode area should not be used when it is smaller than the cathode area, otherwise the anode is easily broken down. Not working properly.
4. When the plating tank impedance is increased, the tank pressure will also increase. When the tank pressure exceeds 10V, the current should not continue to increase, but the current should be adjusted appropriately. For example, the current is 10% high and the plating time is extended by 10%. (as long as it does not affect the hardness)