Cathodic Protection (Zinc Sacrificial Anode)

Zn → Zn²⁺ + 2e⁻

Tổng quan

A zinc sacrificial anode is electrically connected to a steel structure. Since zinc has a more negative electrode potential (-0.76 V) than iron (-0.44 V), zinc preferentially oxidizes, supplying electrons that keep the steel in its reduced (protected) state. The zinc anode is consumed over time and must be replaced.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Zinc Zn	1	(s)

Ví dụ thực tế

Ships' hulls, water heaters, and underground pipelines all use zinc blocks bolted to steel for corrosion protection.

Tầm quan trọng công nghiệp

Cathodic protection prevents billions of dollars in corrosion damage annually to ships, pipelines, bridges, and offshore platforms.

Tính chất

Loại: Electrochemical
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -147,0 kJ/mol

Phản ứng liên quan

Electrolysis of Water Electrolytic Production of Chlorate Electrorefining of Copper Alkaline Battery Discharge Anodizing of Aluminum Chlor-Alkali Electrolysis Chrome Electroplating Nickel-Metal Hydride Battery Sodium-Sulfur Battery Electrochemical CO₂ Reduction to CO

Frequently Asked Questions

What is the equation for Cathodic Protection (Zinc Sacrificial Anode)?

The balanced equation is: Zn → Zn²⁺ + 2e⁻.

What type of reaction is Cathodic Protection (Zinc Sacrificial Anode)?

Cathodic Protection (Zinc Sacrificial Anode) is a electrochemical reaction.

Is Cathodic Protection (Zinc Sacrificial Anode) exothermic or endothermic?

Cathodic Protection (Zinc Sacrificial Anode) is exothermic (releases energy). The enthalpy change (ΔH) is -147.0 kJ/mol.