Cathodic Protection (Zinc Sacrificial Anode)

Zn → Zn²⁺ + 2e⁻

Visão geral

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

Papel	Substância	Coeficiente	Estado
Reagente	Zinc Zn	1	(s)

Exemplo do cotidiano

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

Importância industrial

A proteção catódica previne anualmente milhares de milhões de dólares em danos por corrosão em navios, oleodutos, pontes e plataformas offshore.

Propriedades

Tipo: Electrochemical
Reversível: Não
Energia: 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.