This is a new aluminium anode, with the composition of Al-Zn-In. It has been used by ship builders and harbour constructors as the most advanced and ideal galvanic anode for corrosion prevention. It has the following characteristics: 1. Lightweight. 2. Highest current capacity. 3. Lowest cost per ampere year. 4. Extremely small anodic polarization tendency. 5. Stabilized current output throughout anode life. 6. Optimum driving voltage without over-protection. 7. Uniform anode consumption. 8. Excellent, self-regulating property. 9. Low hydrogen generation.