In the production process of using alkaline galvanizing additives, sometimes such a phenomenon occurs: the drum suddenly explodes while rotating. What is the reason?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product alkaline galvanizing additives BZ-513,during the galvanizing process, the cathode will evolve a lot of hydrogen, so the cathode current efficiency is relatively low, only 70-80%.The hydrogen produced by galvanizing cannot be discharged through the drum eye in time, and a large amount of hydrogen will be gathered in the drum.
The rollers used in many galvanized coatings are not fully immersed, and there is air in the rollers at the same time.If the anode area is smaller, the anode current density will be larger, which will make the anode passivate.In this way, there is a mixture of hydrogen, oxygen and air in the plating solution, and a certain volume ratio is formed. When the explosion limit is reached, the drum will explode.
The resistance of the alkaline zinc plating solution is relatively large. In the production process of barrel galvanizing using alkaline zinc plating additives, the operator should strengthen the management of the plating solution, and the parameters of the plating solution should be controlled within the process range.When the temperature of the plating solution is high, sparks are easily generated during friction during the barrel plating process, which is also the condition for causing explosions.
In order to avoid the explosion of the drum, in the production process of using alkaline galvanizing additives, the drum production should be made with full immersion as much as possible to reduce the volume of air in the drum.If a semi-immersion drum is used for production, the plating should be stopped for a while every 30 minutes to allow the gas accumulated in the drum to be released, and then continue plating.
Therefore, this is the reason why the drum will suddenly explode when we use alkaline galvanizing additives to produce and how to deal with it.