Chrome Plating Troubleshooting

Problem

Cause

Remedy

No deposit. No gassing

No current (or gassing from part)

Check all contacts. Check power source.

No deposit. Work is gassing

Reversed polarity

Anodic work piece. reverse polarity

No deposit. Work is gassing

Too much acid in solution, from previous bath

Discard solution. Check & improve rinsing

No deposit. Work is gassing. Brown stains

Insufficient sulphuric acid in solution.

Add 1/2 teaspoon of battery acid, and try again.

Deposit dull or milky

 

Temperature &/or current balance incorrect

110f = 0.8 amps per sq". 125f =

1.45 amps per sq"

 

Raise temp & amps for more current

Dull spots

 

finger prints etc. passive nickel plate rinsing problem

Clean off prints with talc, or lime

 

Activate by dipping in Hydrochloric acid

 

Check rinse water, use distilled water

Low throwing power

hydrogen gas is trapped

 

Temperature &/or current balance incorrect

 

Work is shielded from anode

Agitate the part to release gas

 

110f = 0.8 amps per sq". 125f =

1.45 amps per sq". Raise temp & amps for more current

 

Move the part to a more prominent position

Pitting

Surface contaminated or bubbles sticking

Improve surface cleaning

Burnt looking plate

 

Temperature &/or current balance incorrect. Current too high

110f = 0.8 amps per sq". 125f =

1.45 amps per sq"

 

reduce amps or use a dummy (add more parts) to 'rob' current

Rough Deposit

 

Amps are too high

 

Smuts on work. Suspended matter in tank

reduce amps or use a dummy (add more parts) to 'rob' current

 

Brush off smuts. Filter solution through a double coffee filter. remove all sludge from tank bottom

 

Poor adhesion of Chrome plate

 

Poor surface preparation

Check cleaning, check for oil or grease in bath. Remove old chrome before plating. Etch nickel plate prior to chrome

 

 

 

Partial Plate on high spot &/or edges.

Insufficient current

Clean anodes by wire wool/brush. Check anode/cathode ratio adequate, and anode distribution is even. Check sufficient power form source. Remove anodes from tank when not in use.

Iridescent colour on dry chrome plate

Insufficient power, or insufficient rinsing

110f = 0.8 amps per sq". 125f =

1.45 amps per sq". Raise temp & amps for more current

 

Improve rinsing and drying procedures

 

Was this article helpful?
0 out of 0 found this helpful