Electro-galvanizing is a common metal surface treatment technology, which deposits a layer of zinc on the surface of metal products by electrochemical methods to improve their corrosion resistance.
Author: Anna
Electro-galvanizing is a common metal surface treatment technology, which deposits a layer of zinc on the surface of metal products by electrochemical methods to improve their corrosion resistance. The following is the general process flow of zinc electroplating:
Pre-plating inspection:
Parts to be plated are inspected to ensure that there are no defects, such as cracks, holes, etc.
Pretreatment:
Lye Degreasing: Remove grease and dirt from the surface of the parts by immersion method or spraying method, etc.
Counter-current rinsing: The workpiece moves in the opposite direction of the water flow to save water and ensure thorough cleaning.
Acid washing to remove rust: Use acidic solution to remove oxidized skin and rust on the surface.
Activation treatment: Chemically activate the surface of the workpiece to improve plating adhesion.
Electroplating:
Pre-treated parts are immersed in an electrolytic solution containing zinc ions.
The part is connected to the cathode of the power supply and the zinc anode is connected to the anode of the power supply.
By applying direct current, zinc ions are dissolved from the anode into the electrolyte and are reduced to zinc metal at the cathode (the part to be plated) and deposited on its surface.
Post-treatment:
Water washing: Removal of residual electrolyte.
Passivation: chemically forms a passivation film on the surface of the zinc layer to further improve corrosion resistance.
Drying: Remove moisture and avoid water damage.
Sorting and Packing: Sort and pack the plated parts according to specifications and applications.
Quality Inspection:
Conduct final quality inspection to ensure that the thickness, uniformity and bonding strength of the plated layer meets the standards.