Galvanic Corrosion of Zinc (Sacrificial Anode)

Zn → Zn²⁺ + 2e⁻

ภาพรวม

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.

ผู้เข้าร่วม

บทบาท	สาร	สัมประสิทธิ์	สถานะ
สารตั้งต้น	Zinc Zn	1	(s)

ตัวอย่างในชีวิตประจำวัน

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

ความสำคัญทางอุตสาหกรรม

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

คุณสมบัติ

ประเภท: Redox
ย้อนกลับได้: ไม่
พลังงาน: คายความร้อน

ปฏิกิริยาที่เกี่ยวข้อง

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).