| Mechanical Pretreatment |
Physically remove large-grained welding slag and spatter to reduce the burden of subsequent chemical cleaning. |
Wire brush rolls, high-pressure water jet (pressure 10-30MPa), sandblasting equipment (quartz sand/alumina abrasive). |
Workpieces with heavy welding slag (e.g., manual arc welding workpieces) and structural parts with excessive surface spatter. |
| Main Cleaning |
Dissolve flux residues, strip oxide layers, and remove fine welding slag residues. |
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| - Chemical Cleaning |
Water-soluble flux is cleaned with hot water; welding slag/oxide layers are dissolved with acidic cleaning agents (e.g., citric acid, hydrofluoric acid). |
Cleaning tank, circulating filtration system (removes welding slag particles from cleaning solution), temperature control device. |
Post-welding flux cleaning for electronic components; post-welding oxide layer removal for stainless steel (nitric acid-hydrofluoric acid mixture is commonly used). |
| - Electrolytic Cleaning |
Targets stubborn oxide layers in the welding heat-affected zone, and peels off impurities via oxygen/hydrogen bubbles generated by electrolysis. |
Electrolytic tank, adjustable DC power supply (current density 5-20A/dm²), cathode moving device (ensures uniform cleaning). |
Oxide layer removal for high-demand workpieces (e.g., automotive electroplated parts), with better performance than single chemical cleaning. |
| - Ultrasonic Cleaning |
Removes fine welding slag and flux residues in gaps with the assistance of chemical cleaning agents. |
Ultrasonic cleaning tank (high frequency optional 40-60kHz), basket-type workpiece holder (facilitates batch processing). |
Deep cleaning of precision welded parts (e.g., connectors, sensor housings). |
| Rinsing |
Multi-stage series rinsing (often equipped with pure water treatment system) to thoroughly remove residual cleaning agents and salts. |
Spray rinsing tank, immersion rinsing tank, EDI pure water treatment device (requires rinsing water resistivity ≥15MΩ・cm). |
Workpieces must be strictly rinsed before electroplating to avoid pinholes and blackening of the coating caused by residual cleaning agents. |
| Drying |
Quickly remove surface moisture to prevent rusting and water stain residues from affecting electroplating appearance. |
Hot air circulation drying oven, infrared dryer (local heating, energy-efficient), cold air blower (low-temperature drying for precision parts). |
Workpieces with high appearance requirements such as galvanized and chrome-plated parts, to avoid water stains during drying. |
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