Copper Electroplating
Cu2+ + 2e− → Cu
Overview
Copper ions from a CuSO₄ solution are reduced at the cathode surface, depositing a thin layer of metallic copper. The anode is typically a copper bar that dissolves to replenish Cu²⁺ in solution. Current density, temperature, and additives control the deposit quality, grain size, and brightness.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Product | Copper Cu | 1 | (s) |
Everyday Example
The shiny copper plating on decorative items, trophies, and plumbing fixtures is applied by this electrochemical process.
Industrial Importance
Copper electroplating is essential in PCB manufacturing, semiconductor interconnects, and decorative finishing. It creates the conducting layers in all electronic devices.
Properties
- Type
- Electrochemical
- Reversible
- Yes
- Energy
- Exothermic
- ΔH
- -65.5 kJ/mol
Related Reactions
Alkaline Battery Discharge
Anodizing of Aluminum
Cathodic Protection (Zinc Sacrificial Anode)
Chlor-Alkali Electrolysis
Chrome Electroplating
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrochemical CO₂ Reduction to CO
Electrochemical Machining (ECM)
Electrolysis of Molten NaCl (Downs Process)
Electrolysis of Water
Frequently Asked Questions
What is the equation for Copper Electroplating?
The balanced equation is: Cu²⁺ + 2e⁻ → Cu.
What type of reaction is Copper Electroplating?
Copper Electroplating is a electrochemical reaction. It is reversible under certain conditions.
Is Copper Electroplating exothermic or endothermic?
Copper Electroplating is exothermic (releases energy). The enthalpy change (ΔH) is -65.5 kJ/mol.