Galvanic Corrosion of Zinc (Sacrificial Anode)

Zn → Zn2+ + 2e−

개요

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.

참여 물질

역할 물질 계수 상태
반응물 Zinc Zn 1 (s)

일상 속 예시

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

산업적 중요성

선박, 해양 구조물, 매설 배관, 저수탱크의 전기화학적 방식(부식 방지)에 널리 사용됩니다. 용융 아연 도금(갈바나이징)도 같은 원리로 철강을 보호합니다.

성질

유형
Redox
가역 반응
아니오
에너지
발열

관련 반응

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) Chlorine Oxidation of Bromide Copper Oxidation by Nitric Acid Hypochlorite Oxidation of Hydrogen Peroxide Hydrogen Peroxide as Oxidizing Agent (Acidic) 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).