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

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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.