In the production process of using acid zinc plating brightener, if the workpiece falls into the plating tank and is not pulled out in time, what will be the impact?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product zinc plating acid zinc plating brightener BZ-528,When the workpiece falls into the galvanizing tank and is not taken out in time, it will cause the increase of iron impurities in the plating solution.At this time, Fe2+, Fe(OH)+, Fe3+, Fe(OH)2+, etc. will form complexes with some bath components with coordination ability, which will increase the consumption of acid zinc plating brightener in the bath.
Especially Fe3+ ions are easy to form flocs in the plating solution, which will not only increase the resistance of the plating solution, but also increase the tank pressure, the current will not go up, and the deposition speed of the workpiece is slow;Moreover, these flocs will absorb a large amount of acid zinc plating brightener from the plating solution, which is the main reason for the large consumption of brightening agent components in the production process.
These workpieces dropped in the galvanizing tank will dissolve in the plating tank. When the content of iron impurities in the plating solution is more than 500mg/L, it is easy to oxidize to form Fe(OH)3 suspended precipitates, which adhere to the surface of the workpiece and The inner cavity will directly affect the use effect of the acid zinc plating brightener.As a result, the brightness of the appearance of the galvanized layer decreases, and the thickness of the galvanized layer of the workpiece and the quality of the passivation film also decrease. This is also the reason for the deterioration of the appearance quality and corrosion resistance of the workpiece.
Therefore, in the production process of using acid zinc plating brightener, we should salvage the workpieces dropped in the galvanizing tank in time to reduce the occurrence of failures, thereby saving production costs.