A zinc plating production line (also known as a cold galvanizing line) is a specialized surface treatment system that deposits a pure zinc coating on metal workpieces at room temperature through electrolytic reactions. Its core principle is to precisely control current, voltage, and other parameters so that zinc ions evenly adhere to the surface, forming a thin, dense protective layer. The system is widely applied in the automotive, electronics, home appliance, and precision hardware industries—ideal for scenarios requiring high coating accuracy and superior surface appearance.
Core Structure:
The zinc plating production line is composed of five main systems:
Pre-treatment System – This foundational stage ensures surface cleanliness and coating adhesion through three key steps:
Degreasing to remove oil and contaminants,Pickling to dissolve rust and oxides, and Activation to improve surface adsorption properties.
Electrolytic System – The heart of the process, consisting of:
Plating Tanks made of corrosion-resistant PP material, filled with zinc salt electrolyte;
Electrodes, including soluble zinc anodes and cathode fixtures (racks or barrels) that ensure uniform current distribution;
Adjustable DC Power Supply with an output range of 0–24V, and current settings tailored to workpiece size.
Post-treatment System – Enhances coating performance through:
Passivation using chromium-free solutions to form a protective film and increase corrosion resistance,Rinsing to remove residual electrolytes, and Drying at low temperatures to prevent oxidation.
Conveying System – Employs automated racks or barrels to ensure smooth, continuous transfer of workpieces between process stages.
Control System – Powered by a PLC and touchscreen interface, it provides real-time monitoring of electrolyte temperature (ambient ±2°C), pH value (±0.1), and coating thickness (precision ±1 μm), ensuring stable and consistent production.
Key Advantages:
Operating at room temperature, the system eliminates the need for high-temperature equipment, resulting in low energy consumption and zero thermal deformation of parts. The coating thickness (5–30 μm) is precisely adjustable, meeting the stringent demands of precision components. With a high degree of automation, a single line can process thousands to tens of thousands of parts per day. The resulting zinc coating is bright, uniform, and decorative, making this technology an essential anti-corrosion solution in modern precision manufacturing.
