Troubleshooting / Electroplating line

Electroplating Line Troubleshooting

The most common electroplating line problems on the plant floor, with the likely causes and the fix for each. Part of the OEE Lab troubleshooting directory.

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Problems on this page:

Plating peeling or blisteringBurnt or rough deposits on edgesThickness uneven or too thinPittingBath chemistry driftingRectifier faultsPoor rack contactFilter or pump failureFume extraction problems

Plating peeling or blistering

Hits OEE: Quality

Symptoms: The deposit lifts off the part, blisters after baking, or fails a bend or tape test.

Cleaning before plating not removing oils
Check the cleaner concentration, temperature and time, and test parts for water break after cleaning.
Activation step weak or skipped
Check the acid dip concentration and contact time.
Parts drying or oxidising between tanks
Shorten transfer times so parts stay wet between steps.
Contaminated rinse water
Check the rinse flow and the water quality.

Prevention: Adhesion tests on samples at the frequency your quality plan sets.

Burnt or rough deposits on edges

Hits OEE: Quality

Symptoms: High current areas are dark, rough or powdery.

Current density too high
Lower the current for the surface area on the rack.
Racking places parts too close to the anodes
Rack parts so edges are not facing the anodes closely.
Bath temperature too low
Check the heater and temperature control.
Agitation too weak
Check the agitation or solution flow.

Prevention: Current and surface area recorded for each rack load.

Thickness uneven or too thin

Hits OEE: Quality

Symptoms: Measured thickness varies across the part or the load.

Anode area or position wrong
Check the anodes and their condition.
Plating time too short
Check the cycle time.
Rack design shielding parts
Use auxiliary anodes or change the racking.
Current reading wrong
Check the rectifier and the meters.

Prevention: Thickness measured on samples from each load.

Pitting

Hits OEE: Quality

Symptoms: Small pits appear in the deposit.

Organic contamination in the bath
Carbon treat the bath as the chemistry supplier advises.
Wetting agent low
Check the additive levels.
Particles in the bath
Check the filtration.
Gas bubbles clinging to parts
Improve agitation.

Prevention: Bath analysis on the schedule the supplier sets.

Bath chemistry drifting

Hits OEE: Quality

Symptoms: Analysis results move out of range and quality changes.

Analysis too infrequent
Analyse at the frequency the supplier recommends.
Drag-out not replaced
Make additions based on throughput.
Contamination from previous tanks
Improve rinsing.
Evaporation
Top up with the right water.

Prevention: Analysis and additions logged.

Rectifier faults

Hits OEE: Availability

Symptoms: The rectifier trips, will not reach current, or shows unstable output.

Cooling fault on the rectifier
Check the fans or cooling water.
Bad connections to the bus bars
Clean and tighten the connections.
Short circuit from a fallen part
Remove fallen parts from the tank.
Control fault
Call the service partner.

Prevention: Bus bar connections checked monthly.

Poor rack contact

Hits OEE: Quality

Symptoms: Some parts on the rack are unplated or thinly plated.

Rack coating damaged so current leaks
Recoat or replace racks.
Contact points dirty or plated over
Strip the contacts on schedule.
Parts loose on the rack
Check the fixing.
Rack not seated on the bar
Check the hooks.

Prevention: Racks inspected at each use.

Filter or pump failure

Hits OEE: Availability

Symptoms: Bath circulation stops or filter pressure rises.

Filter cartridges full
Change the cartridges.
Pump seal leaking
Replace the seal.
Air in the pump
Check the suction.
Pump motor fault
Check the motor.

Prevention: Filter pressure recorded each shift.

Fume extraction problems

Hits OEE: Availability

Symptoms: Fumes escape at the tanks and the area smells of the bath.

Extraction fan or duct fault
Check the fan and ducts.
Slot hoods blocked
Clean the hoods.
Tank covers left off
Use the covers.
Bath running hotter than set
Check the temperature.

Prevention: Extraction checks on the schedule your safety plan sets.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Related equipment guides: powder coating system · paint booth · shot blast machine · heat-treat furnace · parts washer · ultrasonic cleaner · anodising line · hot-dip galvanising line

Stop the same fault coming back

Recurring electroplating line stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

Book a Fabrico demo
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Related tools: full troubleshooting directory · OEE calculator · downtime cost · MTBF / MTTR · glossary

Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover