What is the cause of blistering in alkaline galvanizing process? In addition to the unclean pre-treatment stated in the previous article, you can also investigate from the following 4 directions.
①The oxidized skin is not completely removed
We can check the effect of pickling and descaling, and if no abnormality is found, then we can proceed to the next step of troubleshooting.
②Bad substrate material
If, in the case of production faults in the alkaline galvanizing process, the proportion of blistering of the galvanized layer of the workpieces is relatively high and the batches are large, many of which have been mass-produced, the material factor can be excluded.
③Excessive additives in plating solution
This cause can lead to a brittle galvanized layer. You can first arrange the engineer to observe the brightness of the galvanized layer of the blistering workpiece, if the brightness is moderate, then check the record of adding additives to the plating solution, ask the adjuster whether there is a big adjustment of each solution of the production line, and exclude this cause if no abnormality is found.
④ Excessive impurities in plating solution
This cause of high internal stress in the galvanized layer, the plating plant can analyze the results of the recent analysis of the metal impurity content of the plating solution to see if the heterogeneous metal impurities are all within the control range.
How can I tell if organic and inorganic non-metallic impurities are out of specification? Since it is not possible to perform a chemical analysis, you can determine whether a major treatment is needed by checking whether the shop's galvanizing production line tank maintenance schedule is in place.
Good maintenance of the bath will help to avoid blistering and other faults in the plating layer. Therefore, when customers use Bigely alkaline galvanizing brightener, we will arrange engineers to provide technical support to help customers control the zinc content, sodium hydroxide content, additives and impurities in the bath.
If you need to buy alkaline galvanizing brightener, please feel free to contact us.
