October 24, 2022
Optimization of zinc plating by sulfate
The biggest advantage of sulfate galvanizing is current efficiency up to 100%, fast deposition rate, which is incomparable to other galvanizing processes. Because the coating crystallization is not fine enough, the dispersion ability and deep plating ability are poor, so it is only suitable for the plating of pipe and wire with simple geometric shape. Sulfate electrogalvanizing iron alloy process is optimized to the traditional sulfate galvanizing process, only the main salt zinc sulfate is retained, and other components are discarded. An appropriate amount of iron salt was added to the new process formula to make the original single metal coating form zinc iron alloy coating. The recombination of the process not only carries forward the advantages of high current efficiency and fast deposition rate of the original process, but also makes the dispersion ability and deep plating ability greatly improved. Complex parts can not be plated in the past, but now simple and complex parts can be plated, and the protection performance is increased by 3 ~ 5 times than that of single metal. The PRODUCTION PRACTICE SHOWS THAT THE GRAIN OF THE COATING IS FINER AND BRIGHTER THAN THE ORIGINAL ONE, AND THE DEPOSITION rate is faster. The coating thickness reaches the requirement within 2 ~ 3 min.
Conversion of sulfate to zinc plating
Sulfate electrogalvanized iron alloy only keep the main salt zinc sulfate sulfate, the rest of the components such as aluminum sulfate, alum (potassium aluminum sulfate) can be in the bath treatment, adding sodium hydroxide to the formation of insoluble hydroxide precipitation removal; For organic additives, add powdered activated carbon adsorption removal. The experimental results show that aluminum sulfate and potassium aluminum sulfate are difficult to be completely removed at one time, which has an effect on the brightness of the coating, but it is not serious, and can be consumed along with it. At this time, the brightness of the coating can be restored and the solution can be treated, and the composition content required by the new process can be supplemented, that is, the transformation is completed.
Fast deposition rate and excellent protective performance
The current efficiency of sulfate electrogalvanizing iron alloy process is as high as 100%, and the deposition rate is incomparable to any galvanizing process. The running speed of the fine tubules is 8 ~ 12 m/min, and the average coating thickness is 2m/min, which is difficult to achieve by continuous galvanizing. The coating is bright and delicate. According to the national standard GB/T10125 "artificial atmosphere test - salt spray test" method test, 72 h, coating intact, no change; At 96 h, a small amount of white rust appeared on the coating surface.
Unique cleaner production
The galvanized pipe adopts the sulfate electrogalvanized iron alloy technology, so that the holes between the grooving of the production line are straight through without any solution out or overflow. Each working procedure of the production process is composed of the circulation system, the tank solution is acid alkali solution, electroplating solution, light and passivation solution, etc., only recycling does not leak or discharge to the system, the production line is only set up 5 cleaning tanks, recycling regular discharge, especially the passivation after no cleaning of no wastewater production process.
Particularity of electroplating equipment
The electroplating of galvanized pipe copper wire electroplating is the same as that of continuous electroplating, but the plating equipment is different. Iron wire with its thin strip characteristics and design of the tank, the tank is long and wide but shallow. Electroplating wire through the hole, in a zigzag spread at the liquid level, maintain mutual spacing. And galvanized pipe is different from iron wire, has its own unique, trough equipment is more complex. The tank is composed of the upper and lower two parts, the upper part of the plating tank, the lower part of the solution circulation storage tank, forming a narrow and wide, trapezoidal tank, galvanized pipe electroplating channel is provided in the plating tank, the bottom of the tank has two through holes connected with the lower storage tank, and the formation of the bath bath circulation reuse system with the pump. Therefore, galvanized pipe is the same as wire plating, plating parts are dynamic, and different from wire plating, galvanized pipe plating solution is also dynamic.
