Galvanic Corrosion of Zinc (Sacrificial Anode)
Zn → Zn2+ + 2e−
Tổng quan
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.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Zinc Zn | 1 | (s) |
Ví dụ thực tế
Galvanized steel roofing, fencing, and car bodies are coated with zinc that corrodes preferentially, protecting the steel underneath.
Tầm quan trọng công nghiệp
Zinc galvanizing protects over 100 million tonnes of steel annually. Sacrificial zinc anodes protect ship hulls, pipelines, and offshore structures from corrosion.
Tính chất
- Loại
- Redox
- Thuận nghịch
- Không
- Năng lượng
- Tỏa nhiệt
Phản ứng liên quan
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).