What affects the galvanizing efficiency of galvanized steel drums?
Galvanized galvanized steel drums are the most commonly used metal packaging drums. Compared with other galvanized steel drums, they have a long service life and are not easy to rust, so they are widely used. But the production process is more troublesome, especially the galvanizing efficiency. In the production process, we found some reasons that affect the efficiency of galvanizing:
1. Poor electrical conductivity. The current will be consumed on the wire, so that the current distributed to the workpiece will be smaller than expected;
2. The pretreatment is not thorough enough. The appearance of bows and arrows generally has an oxide film, which will affect the accumulation of zinc;
3. The carbon content of the workpiece is too high. Ordinary high carbon steel will reduce the hydrogen precipitation potential, so that the hydrogen evolution rate on the surface of the workpiece will be accelerated, and the current rate will naturally be reduced a lot;
4. The temperature of the liquid is low. When the temperature of the transfer liquid is lower than the normal temperature, the current density of the distribution will be correspondingly reduced, so that the accumulation speed of the galvanized layer will be correspondingly reduced;
5. The workpiece is bundled too tightly. Doing so will cause a part of the workpiece to be shielded when galvanizing, resulting in too thin galvanized layer;
6. The workpiece is corroded. When the hydrogen evolution potential is reduced, the hydrogen evolution rate on the surface of the workpiece will be accelerated, and the current efficiency will be lower, which will also affect the accumulation rate of zinc. So what should be done? We should add an appropriate amount of corrosion inhibitor to the pickling solution to remove the oxide skin, and do more inspections during the pickling process;
7. The additive content in the passivation solution is too low. If the additive is too low, the dispersion ability will be affected, and the part of the coating will appear very thin.
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