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Brass electroplating onto plastics

I have problems to plate plastics with brass. First I plate copper to the plastics and then the brass, but after I plate with brass there are many black spot on the product. Does anyone have opinion for this case?

Kusuma P [last name deleted for privacy by Editor]
- Bandung, West java, Indonesia

Kusama,

You need to plate nickel after the copper, because it is the correct method for plating brass on any surface not only on plastics. So, copper, bright nickel, and afterwards brass.

Good luck,

Rafael A [last name deleted for privacy by Editor]
- Caracas, Venezuela

Dear sir,

Plz specify whether after brass plating on copper surface, you are using a lacquer also on the brass surface? Because brass has the property of getting tarnished very quickly with time in contact with environmental factors viz. moisture, temp, etc you find black spots on the brass surface. So to protect the brass coating give the plated material a dip in lacquer.

Good luck,

Sandeep J [last name deleted for privacy by Editor]
- New Delhi, India

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