Electroplating and galvanizing of electric heating pipes is one of the effective methods to prevent steel wire corrosion

Electroplating and galvanizing of electric heating pipes is one of the effective methods to prevent steel wire corrosion

Galvanizing is one of the effective methods to prevent steel wire corrosion. There are generally two methods for galvanizing, one is electrogalvanizing, and the other is hot-dip galvanizing. The disadvantage of hot-dip galvanizing is its high strength loss. In the production process of small-sized steel wire ropes, most of them choose electro galvanizing as the raw material for coating processing of rope steel wires. The advantage of electrogalvanizing is that the thickness of the steel wire coating is uniform and dense, and the mechanical properties of the steel wire before and after plating have little change, which can also be adjusted according to requirements; The disadvantage is that if the steel wire is not cleaned thoroughly before plating, the adhesion between the coating and the steel wire substrate is poor, and it is prone to dezincification. Therefore, the quality control of the galvanized layer on galvanized steel wire is very important.

The production process of electric galvanizing is as follows: wire laying → acid washing → water washing → electric galvanizing → cold water washing → hot water washing → drying → wire winding. Using zinc sulfate salt electroplating, the mass concentration of zinc sulfate is 400-600 g/L, and the pH value of the electroplating solution is 2-4. In the production process of electrogalvanizing, the key factors affecting the quality of galvanizing are the cleanliness of steel wire pickling before electroplating, the concentration of electroplating solution, pH value control, and the size of single wire current. The quality of pickling directly affects the bonding strength between the coating and the substrate, and the concentration of the electroplating solution directly determines the rate of ion supplementation in the solution after ion migration, eliminating concentration polarization phenomenon.

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