Overview of Pulse Electroplating Process for Electric Heating Tubes

Overview of Pulse Electroplating Process for Electric Heating Tubes

Pulse electroplating is an electroplating device established by using a pulse power supply and a plating bath. In an electrolyte solution containing a certain metal ion, the plated workpiece is used as the cathode, and the anode is a metal or insoluble anode of that metal ion. A certain waveform of pulse current is applied to make the gold ion pulse electrodeposit on the cathode.

The current waveform used for pulse electroplating includes square wave (or rectangular wave), sine half wave, sawtooth wave wave and interval sawtooth wave wave. Generally, rectangular wave is preferred for single metal plating.

Pulse electroplating can overcome the shortcomings of direct current electroplating, mainly due to the short pulse width (i.e. conduction time) and high peak current. During the T period, metal ions near the cathode sharply decrease, but the diffusion layer is cut off before it can grow thick. During the pulse interval, the metal ions lacking on the cathode surface are promptly replenished from the solution, and the pulse diffusion layer is basically eliminated, And make the concentration of metal ions in the electrolyte tend to be consistent. In this way, pulse electroplating can adopt a higher average cathode current density, which not only does not decrease current efficiency, but also improves the quality of the coating.

Reasons for peeling of acidic galvanized coatings

① Insufficient surface preparation work of the product;

② The electrolyte is contaminated by organic matter;

③ Hydrogen charging on the surface of parts during corrosion and electrochemical oil removal processes.

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