Precautions for zinc bath design

The zinc bath or pot used for hot dip galvanization is usually made of low carbon steel with very little carbon content. This is to increase the incidence of alloying and thermal corrosion during use. If the data of zinc pot is used improperly, can extend the service life of zinc pot greatly. Steel containing impurities or containing too much carbon should not be used as a zinc pot, thus presenting many new materials to replace steel, such as ceramic materials and silicon carbide materials. As an improvement, new zinc-pot maintenance coatings, such as industrial ceramic coatings, can also be applied to the inner walls of traditional zinc-pot. This industrial ceramic coating generally meets the following basic requirements:

1) the structure is tightly and intact without holes.

2) it has a strong binding force with the underlying metal.

3) high hardness, wear resistance and corrosion resistance.

4) evenly distributed on the whole surface, good heat capacity with the matrix.

5) the thermal shrinkage and deformation performance of two different materials can be restrained due to different thermal expansion coefficient.

Now we are going to talk about the design of the zinc tank and the related requirements

Design of zinc bath

Designed a tolerance has a high concentration of sodium hydroxide solution (115-185 - g/L) and metal zinc soluble zinc tank, hot dip galvanized, first of all, to ensure the dissolve zinc slot on top of metal zinc and steel or steel gelizha must adhere to the constant contact, thus abilities constitute the primary battery is invalid, prompting metal zinc to bump the rate of dissolution. If they have poor direct contact, they dissolve too slowly to maintain sufficient amounts of zinc in the zinc bath.

Next, want to use air mixing liquid circulating pump or pump under the internal pipeline will dissolve zinc of zinc solution to output to the no cyanide zinc bath from time to time, at the same time, to force solution of soluble zinc tank enough convective motion, or article of metal zinc appearance will constitute a solid layer of zinc oxide or hydrogen zno shell, thus barriers, the dissolution of zinc once attack this kind of condition, this layer of crust must remove in time, otherwise the metal zinc wouldn't dissolve to sodium hydroxide solution.

In addition, the general well-designed zinc-melting tank should be able to easily supplement metal zinc balls, zinc strips, sodium hydroxide in consumption. The ideal form is that the rated addition of sodium hydroxide can never be required in cyanide-free alkaline zinc plating, and all zinc ions and electrolytes can be supplemented by zinc solution tanks.