Factors affecting mechanical galvanizing

In the actual production process, common factors that affect the speed and quality of galvanizing are:
1) Incomplete pre-treatment. There is an oxide film on the surface of the workpiece, which affects the normal deposition of zinc.
2) Poor conductivity. The current is consumed on the wire, and the current distributed to the surface of the workpiece is too small.
3) The workpiece has a high carbon content. High carbon steel, cast iron, and other materials can reduce the potential for hydrogen precipitation, accelerate hydrogen evolution on the surface of the workpiece, and reduce current efficiency.
4) The workpiece is tightly tied. During galvanizing, the workpiece is partially shielded, resulting in an excessively thin coating.
5) The plating solution temperature is too low. When the temperature of the plating solution is low, the current density delivered decreases accordingly, and the deposition rate of the coating will inevitably decrease.
6) The sodium hydroxide content in the plating solution is relatively high. When the sodium hydroxide content is high, the current efficiency decreases accordingly.
7) The additive content in the plating solution is low. A low content of additives can affect the dispersion ability and make the coating appear too thin locally.
8) The estimated area of the plated part is insufficient, and the current density delivered during plating appears to be too small.
9) The suspension method of the workpiece is improper, and the distance between it and the zinc anode is too large. The position should be adjusted.
10) The workpiece is excessively corroded. Reducing the potential for hydrogen precipitation results in a decrease in the efficiency of the accelerated current for hydrogen evolution on the surface of the workpiece, thereby affecting the deposition rate of zinc. An appropriate amount of corrosion inhibitor should be added to the pickling solution. If the oxide scale is too thick in some areas, mechanical methods should be used to remove it first. During the pickling process, more inspections should be conducted.
11) Anode passivation. The reduction in effective area affects the normal distribution of current.
12) The sodium hydroxide content is low. If the sodium hydroxide content is low, the current density cannot be increased and the anode is passivated.