What is the general anode efficiency rating of aluminum?

The general anode efficiency rating of aluminum is indeed around 90%. This rating indicates how effectively aluminum anodes can convert electrical energy into protective cathodic current. Anode efficiency is a crucial factor in cathodic protection systems, as it affects the overall effectiveness and lifespan of the anode material.

Aluminum is favored in certain cathodic protection applications because, despite its relatively low weight and cost, it provides a high level of anodic output. The efficiency rating represents how much of the anode's current output is useful for protection versus being lost as waste. The high rating reflects aluminum's suitability for use in various corrosive environments, making it a reliable choice for protecting steel structures from corrosion.

In summary, the 90% efficiency rating highlights aluminum's effectiveness as a sacrificial anode, facilitating its common use in cathodic protection systems.