High - potential magnesium alloy sacrificial anode
Detail
The high - potential magnesium alloy sacrificial anode is a magnesium - manganese alloy (with the Mn content reaching even 0.5% - 1.3%). Its
electrochemical properties meet the requirements that the open - circuit potential 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/CuSO₄ and a current efficiency greater than 60%); the low - potential magnesium alloy sacrificial anode is a magnesium - aluminum - zinc alloy.
High - potential magnesium anodes are divided into two categories: casting and extrusion. They are mainly used in soil environments with high electrical
resistivity and in fresh water, such as for the protection of steel - structured buildings like oil pipelines, offshore oil drilling platforms, port terminals, and underground buildings. During the production process, elements such as manganese and iron need to be controlled, the content of harmful impurities should be reduced, the grain size should be refined, and casting defects should be minimized to avoid the self - dissolution tendency of the magnesium anode. Otherwise, it is difficult to meet the electrochemical performance requirements. Through the short - process casting technology, layered heating, or low - pressure transfer pouring technology, the high - potential magnesium anode products produced by the company have good electrochemical performance, as well as passing ultrasonic flaw detection, with no shrinkage cavities, good surface quality, and no inclusions or oxide inclusions.