Aluminum Alloy Sacrificial Anode For Hull
Aluminum alloy sacrificial anodes are an efficient and cost-effective solution for protecting the hulls of marine vessels and offshore structures from corrosion. Their high efficiency, long life, and environmental benefits make them a preferred choice in the marine industry.
Overview
Function and Purpose
Corrosion Protection: Sacrificial anodes are used to protect the metallic hulls of ships and offshore structures from corrosion. This is especially important in saltwater environments where the risk of corrosion is high.
Cathodic Protection: Aluminum anodes provide cathodic protection by corroding (sacrificing themselves) instead of the hull. This is due to the aluminum anode having a more negative electrochemical potential than the steel of the hull.
Composition
Aluminum Alloys: The anodes are typically made from high-purity aluminum mixed with small amounts of other elements such as zinc and indium. Common aluminum alloy used for sacrificial anodes is:
Al-Zn-In: Contains aluminum (90-95%), zinc (2-6%), and indium (0.015-0.050%).
Purpose of Additives: Zinc helps in enhancing the electrochemical properties, while indium prevents the formation of an insulating film on the anode surface.
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