Chrome Electroplating
Cr3+ + 3e− → Cr
Übersicht
Chromium plating deposits a thin layer of chromium from a chromic acid or trivalent chromium bath. Decorative chrome is only 0.25–0.5 μm thick over a nickel undercoat, while hard chrome (industrial) is 20–250 μm thick. Chrome provides exceptional hardness (68–72 HRC), corrosion resistance, and a mirror-like finish.
Teilnehmer
| Rolle | Substanz | Koeffizient | Zustand |
|---|---|---|---|
| Produkt | Chromium Cr | 1 | (s) |
Alltägliches Beispiel
The shiny chrome trim on cars, bathroom fixtures, and kitchen appliances is applied by this electroplating process.
Industrielle Bedeutung
Chrome plating is essential for automotive trim, hydraulic cylinders, piston rings, and industrial rollers. Environmental regulations are driving a shift from hexavalent to trivalent chrome.
Eigenschaften
- Typ
- Electrochemical
- Reversibel
- Ja
- Energie
- Exotherm
- ΔH
- -215,0 kJ/mol
Verwandte Reaktionen
Electrorefining of Copper
Alkaline Battery Discharge
Anodizing of Aluminum
Chlor-Alkali Electrolysis
Nickel-Metal Hydride Battery
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrolysis of Molten NaCl (Downs Process)
Lead-Acid Battery Discharge
Hall-Héroult Process (Aluminum Smelting)
Electrolysis of Water
Frequently Asked Questions
What is the equation for Chrome Electroplating?
The balanced equation is: Cr³⁺ + 3e⁻ → Cr.
What type of reaction is Chrome Electroplating?
Chrome Electroplating is a electrochemical reaction. It is reversible under certain conditions.
Is Chrome Electroplating exothermic or endothermic?
Chrome Electroplating is exothermic (releases energy). The enthalpy change (ΔH) is -215.0 kJ/mol.