Chrome Electroplating
Cr3+ + 3e− → Cr
Visão geral
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.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Produto | Chromium Cr | 1 | (s) |
Exemplo do cotidiano
The shiny chrome trim on cars, bathroom fixtures, and kitchen appliances is applied by this electroplating process.
Importância industrial
A cromagem é essencial para frisos automóveis, cilindros hidráulicos, segmentos de pistão e rolos industriais. As regulamentações ambientais estão a impulsionar a passagem do crómio hexavalente para o trivalente.
Propriedades
- Tipo
- Electrochemical
- Reversível
- Sim
- Energia
- Exotérmico
- ΔH
- -215,0 kJ/mol
Reações relacionadas
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.