Galvanic Corrosion of Zinc (Sacrificial Anode)

Zn → Zn2+ + 2e−

Übersicht

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.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Zinc Zn 1 (s)

Alltägliches Beispiel

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

Industrielle Bedeutung

Zinc galvanizing protects over 100 million tonnes of steel annually. Sacrificial zinc anodes protect ship hulls, pipelines, and offshore structures from corrosion.

Eigenschaften

Typ
Redox
Reversibel
Nein
Energie
Exotherm

Verwandte Reaktionen

Iron(II) to Iron(III) Oxidation by Oxygen Bleaching with Sodium Hypochlorite Copper Reduction of Silver Ion Aqua Regia Dissolving Gold Cerium(IV) Reduction by Iron(II) Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) Hydrogen Peroxide Disproportionation Displacement of Hydrogen from Acid by Magnesium

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).