Electromagnetic Flowmeter for Lithium-Battery Copper Foil Electrolyte: Corrosive Acid Flow Case
Published On: September 30, 2026
Lithium-Battery Copper Foil Electrolyte — Electromagnetic Flowmeter Application
A lithium-battery copper-foil plant, producing foil by electrodeposition on rotating cathodes, needed flow measurement on corrosive electrolyte circulation — a hot copper-sulfate and sulfuric-acid solution — plus additive dosing that directly influences foil grain structure and thickness uniformity. Contamination and dosing drift are costly, so accuracy and material compatibility were critical.
Working Condition
- Media: hot, acidic copper-sulfate / sulfuric-acid electrolyte.
- Continuous electrolyte circulation across the electrodeposition line.
- Additive dosing must be precise to keep foil uniform.
- Purity is critical — wetted parts must not contaminate the bath.
Customer Pain Points
Acidic electrolyte attacked ordinary electrodes and linings, shortening meter life. Metal contamination from wetted parts threatened product purity, and additive dosing demanded tight, repeatable accuracy — any drift showed up as inconsistent foil thickness. The combination of corrosion and purity requirements ruled out many standard materials.
Engineering Selection
| Parameter | Selection | Reason |
|---|---|---|
| Lining | PTFE / PFA | Resists hot sulfuric-acid electrolyte |
| Electrode | Tantalum / platinum | Corrosion resistance with low contamination risk |
| Accuracy | High-accuracy class | Precise additive dosing and circulation control |
| Bore | Smooth, full-bore | Minimizes buildup and pressure loss |
| Output | 4–20 mA + pulse + digital | Closed-loop dosing and process data logging |
Installation Logic
- Confirm the liner and electrode pair against the exact electrolyte chemistry and temperature.
- Place the meter where the pipe always runs full to hold accuracy.
- Allow straight runs away from the dosing injection for representative flow.
- For dosing, mount the meter close to the injection point to shorten control lag.
- Keep the bore and electrodes clean and non-reactive to protect foil purity.
Why an Electromagnetic Flowmeter
Electromagnetic flowmeters are a natural fit for copper-foil electrolyte because the acidic, conductive solution produces a strong signal while the unobstructed full bore presents nothing to foul or restrict the circulating bath. Choosing a PTFE or PFA liner together with tantalum or platinum electrodes keeps the wetted parts resistant to hot sulfuric acid and avoids introducing metal contamination. The high-accuracy measurement class supports tight additive dosing, so foil thickness and grain structure stay consistent across the electrodeposition line.
Result
The PTFE-lined, tantalum-electrode meter delivered stable measurement in hot acidic electrolyte without rapid corrosion failure. Better additive-dosing consistency supported more uniform foil thickness, and selecting non-contaminating wetted materials reduced purity risk.
Procurement Decision
For copper-foil and lithium lines, prioritize electrodes and lining for acid resistance and low contamination, specify a high-accuracy class for dosing, and confirm the meter suits continuous, full-bore service.
