What is an aluminum alloy sacrifice anode? Have what advantage

Aluminum alloy sacrificial anodization is used for cathodic protection of metal against erosion in ships, machinery and equipment, Marine engineering and seaport measures as well as pipelines and cables in sea mud.

The most commonly used aluminum alloy anodes are Al-Zn-In system and Al-Zn-Hg system anodes. Aluminum alloy anodes are produced In accordance with gb4948-2002 "Al-Zn-indium alloy sacrifice anodes" scale. Have on the website, can go to consult