The high - potential magnesium alloy sacrificial anode is a magnesiummanganese alloy (with the Mn content reaching even 0.5%- 1.3%). ltselectrochemical properties meet the requirements that the open - circuitpotential is greater than - 1.7V and the current efficiency is greater than 50%(Ultra -high - potential anodes refer to magnesium anodes with an open-circuit potential >-1.85V relative to Cu/CuS04 and a current efficiencygreater than 60%); the low - potential magnesium alloy sacrificial anode is amagnesium -aluminum - zinc alloy.

High - potential magnesium anodes are divided into two categories: castingand extrusion. They are mainly used in soil environments with high electricalresistivity and in fresh water, such as for the protection of steel -structuredbuildings like oil pipelines, offshore oil drilling platforms, port terminals, andunderground buildings. During the production process, elements such asmanganese and iron need to be controlled, the content of harmful impuritiesshould be reduced, the grain size should be refined, and casting defects shouldbe minimized to avoid the self - dissolution tendency of the magnesiumanode. Otherwise, it is difficult to meet the electrochemical performancerequirements. Through the short - process casting technology, layered heating.or low - pressure transfer pouring technology, the high - potential magnesiumanode products produced by the company have good electrochemicalperformance, as well as passing ultrasonic flaw detection, with no shrinkagecavities, good surface quality, and no inclusions or oxide inclusions.