Galvanic Corrosion of Zinc (Sacrificial Anode)

Zn → Zn2+ + 2e−

Descripción general

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

Rol Sustancia Coeficiente Estado
Reactivo Zinc Zn 1 (s)

Ejemplo cotidiano

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

Importancia industrial

La galvanización con zinc protege más de 100 millones de toneladas de acero al año. Los ánodos sacrificiales de zinc protegen cascos de barcos, tuberías subterráneas y plataformas marinas.

Propiedades

Tipo
Redox
Reversible
No
Energía
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).