Galvanic Corrosion of Zinc (Sacrificial Anode)

Zn → Zn²⁺ + 2e⁻

Visão geral

Zinc acts as a sacrificial anode when electrically connected to iron or steel, preferentially oxidizing to protect the less reactive metal. Zinc's standard reduction potential (-0.76 V) is more negative than iron's (-0.44 V), so zinc corrodes first. This is the principle of cathodic protection and galvanization.

Participantes

Papel	Substância	Coeficiente	Estado
Reagente	Zinc Zn	1	(s)

Exemplo do cotidiano

Galvanized steel roofing, fencing, and car bodies are coated with zinc that corrodes preferentially, protecting the steel underneath.

Importância industrial

A protecção catódica por ânodos de sacrifício de zinco é utilizada em navios, pontes, oleodutos subterrâneos e estruturas offshore para prevenir corrosão metálica.

Propriedades

Tipo: Redox
Reversível: Não
Energia: Exotérmico

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Frequently Asked Questions

What is the equation for Galvanic Corrosion of Zinc (Sacrificial Anode)?

The balanced equation is: Zn → Zn²⁺ + 2e⁻.

What type of reaction is Galvanic Corrosion of Zinc (Sacrificial Anode)?

Galvanic Corrosion of Zinc (Sacrificial Anode) is a redox reaction.

Is Galvanic Corrosion of Zinc (Sacrificial Anode) exothermic or endothermic?

Galvanic Corrosion of Zinc (Sacrificial Anode) is exothermic (releases energy).