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Copper is depositing on steel without current imposed!

I'm a doctor and my topic is about electrodeposition of copper on metallic substrates. I have some problems, I prepared bath of acid copper bath but when I want to introduce my substrate into the bath it began spontaneous and rapid deposition of copper without current imposed. What is this phenomena?

Ilou Mohamed
- Eljadida, Morocco
2003

This is a problem called "immersion plating". You will not be able to successfully electroplate copper onto steel from an acid copper bath because of this problem. For a fuller understanding you can look up the Nernst Equation. But practically, you must deposit copper onto steel from a copper pyrophosphate or copper cyanide bath, or you must plate something else (like nickel or electroless nickel) onto the steel first.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2003

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