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Aluminum-Zinc-Indium-Cadmium Alloy Sacrificial Anode (Model 11)

Aluminum Alloy Sacrificial Anode is a commonly used cathodic protection material, primarily employed for protecting metal structures in seawater environments. Its fundamental principle involves connecting the aluminum alloy sacrificial anode to the protected metal structure through an electrochemical corrosion process, forming a galvanic cell. In an electrolyte solution (such as seawater), the aluminum alloy sacrificial anode acts as the negative electrode, preferentially losing electrons and undergoing oxidation, thereby transferring electrons to the protected metal. This lowers its potential and inhibits corrosion¹².

Main Performance and Characteristics

1. Electrochemical Performance: Aluminum alloy sacrificial anodes exhibit excellent electrochemical performance, with a high electrical output per unit weight of anode material—approximately three times that of zinc anodes and twice that of magnesium anodes. They perform well in seawater and other media containing chloride ions, with strong self-regulating capabilities for current output¹.
2. Electrode Potential: The electrode potential of aluminum alloy sacrificial anodes typically ranges between -0.75 to -1.30 V (SHE)³.
3. Current Efficiency: Current efficiency ranges between 95% (for Hg-containing alloys) and 70%–80% (for Cd-, In-, or Sn-containing alloys)³.

Application Scope and Limitations

1. Suitable Environments: Aluminum alloy sacrificial anodes are suitable for cathodic protection against metal corrosion in seawater environments, including ships, mechanical equipment, marine engineering, port facilities, as well as pipelines and cables in seabed mud³⁴.
2. Usage Limitations: They are not recommended for use in soil environments because the corrosion products formed on their surface are difficult to dissipate in soil. This can lead to the formation of a dense product film around the anode, hindering current generation and potentially causing cathodic protection failure³.

Manufacturing Process and Quality Inspection

The production process of aluminum alloy sacrificial anodes includes raw material preparation, processing and shaping, quality inspection, and other steps. Multiple rounds of spectral analysis and electrochemical testing are required during production to ensure product quality⁴.

In summary, aluminum alloy sacrificial anodes demonstrate outstanding performance in protecting metal structures in seawater environments due to their excellent electrochemical properties and broad application range. However, attention must be paid to their environmental limitations.