Cathodic Protection (Zinc Sacrificial Anode)
Zn → Zn2+ + 2e−
概要
A zinc sacrificial anode is electrically connected to a steel structure. Since zinc has a more negative electrode potential (-0.76 V) than iron (-0.44 V), zinc preferentially oxidizes, supplying electrons that keep the steel in its reduced (protected) state. The zinc anode is consumed over time and must be replaced.
参加者
| 役割 | 物質 | 係数 | 状態 |
|---|---|---|---|
| 反応物 | Zinc Zn | 1 | (s) |
日常の例
Ships' hulls, water heaters, and underground pipelines all use zinc blocks bolted to steel for corrosion protection.
産業上の重要性
陰極防食は、船舶、パイプライン、橋梁、沖合プラットフォームにおける年間数十億ドルの腐食損害を防いでいます。
特性
- タイプ
- Electrochemical
- 可逆的
- いいえ
- エネルギー
- 発熱性
- ΔH
- -147.0 kJ/mol
関連する反応
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 Cathodic Protection (Zinc Sacrificial Anode)?
The balanced equation is: Zn → Zn²⁺ + 2e⁻.
What type of reaction is Cathodic Protection (Zinc Sacrificial Anode)?
Cathodic Protection (Zinc Sacrificial Anode) is a electrochemical reaction.
Is Cathodic Protection (Zinc Sacrificial Anode) exothermic or endothermic?
Cathodic Protection (Zinc Sacrificial Anode) is exothermic (releases energy). The enthalpy change (ΔH) is -147.0 kJ/mol.