Cathodic Protection (Zinc Sacrificial Anode)

Zn → Zn²⁺ + 2e⁻

Descripción general

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.

Participantes

Rol	Sustancia	Coeficiente	Estado
Reactivo	Zinc Zn	1	(s)

Ejemplo cotidiano

Ships' hulls, water heaters, and underground pipelines all use zinc blocks bolted to steel for corrosion protection.

Importancia industrial

La protección catódica previene miles de millones de dólares en daños por corrosión al año en barcos, oleoductos, puentes y plataformas marinas.

Propiedades

Tipo: Electrochemical
Reversible: No
Energía: Exotérmico
ΔH: -147,0 kJ/mol

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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.