Cathodic Protection (Zinc Sacrificial Anode)
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Zn → Zn2+ + 2e−
概述
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.
参与者
| 角色 | 物质 | 系数 | 状态 |
|---|---|---|---|
| 反应物 | Zinc Zn | 1 | (s) |
日常示例
Ships' hulls, water heaters, and underground pipelines all use zinc blocks bolted to steel for corrosion protection.
工业重要性
阴极保护每年可防止船舶、管道、桥梁和海上平台因腐蚀造成数十亿美元的损失。
属性
- 可逆
- 否
- 能量
- 放热
- ΔH
- -147.0 kJ/mol
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.