处理方法：① 锌含量一般控制在8~12g/L；② 为了稳定溶液，应将其控制在[NaOH]/[Zn]²+]=8~10或[NaOH]/[ZnO]=10~12。
Effects: ① the zinc content is too low, the upper limit of current density and current efficiency are reduced, and the galvanizing speed is slow; The content is too high, the coating is rough and dark, and the dispersion ability and deep plating ability
are also low;
② The content of sodium hydroxide is too low, the anode is passivated, the cell voltage increases, and the coating is dark and rough; High content and fast anodic dissolution lead to increasing zinc content and rough coating.
Treatment method: ① generally control the zinc content at 8 ~ 12g / L; ② In order to stabilize the solution, it should be controlled at [NaOH] / [Zn] ²+]= 8 ~ 10 or [NaOH] / [ZnO] = 10 ~ 12.
Influence of oil stain in zincate galvanizing solution on coating and treatment:
If the bath solution is polluted by oil due to careless operation (mostly caused by the old cotton yarn wiped by the machine falling into the bath), the plated workpieces will be scratched, foggy, foamed and the solution is turbid, and the production
will not continue.
Treatment method: ① first use coarse paper (white paper without filler), cut it into 16 ~ 32 open size, and stick it to the liquid level to remove the oil film;
② Under continuous stirring, the aluminum powder is sprinkled into the tank. The aluminum powder reacts violently with the plating solution and releases hydrogen to hold the dirt out of the liquid level. At this time, one person keeps stirring
and one person keeps fishing out with nickel plated copper wire mesh. After a certain time, sprinkle some aluminum powder to continue the above operation. 10001, about 1kg aluminum powder is used in southern language. The problem is completely solved
and the plated workpiece is completely normal.