Chrome Electroplating
Cr3+ + 3e− → Cr
Tổng quan
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.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Sản phẩm | Chromium Cr | 1 | (s) |
Ví dụ thực tế
The shiny chrome trim on cars, bathroom fixtures, and kitchen appliances is applied by this electroplating process.
Tầm quan trọng công nghiệp
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.
Tính chất
- Loại
- Electrochemical
- Thuận nghịch
- Có
- Năng lượng
- Tỏa nhiệt
- ΔH
- -215,0 kJ/mol
Phản ứng liên quan
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.