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　　__ke_temp_url__Mn: Manganese is easy to combine with harmful impurities, thus eliminating the Fe on the corrosion resistance of the alloy, the corrosion rate is greatly reduced. Manganese and iron to form Mn-Fe compounds, due to the role of gravity to precipitate the compound in the bottom of the crucible, the rest of the compounds did not form Fe surrounded by manganese, which greatly reduces the feeling is really its corrosion resistance to the alloy, Do not know to improve the current efficiency, in order to reduce the risk of Fe in the anode, Fe: Mn ratio should be less than 0.032.

　　Fe: Fe in the anode of the solubility is very small, in the alloy liquid crystallization process, Fe precipitation in the grain boundary with magnesium to form a galvanic pair, because there is a large potential difference between Fe and Mg, so easy to produce Current, so that the tendency to increase the anode autolysis, accelerating the corrosion rate of the alloy, reducing the anode current efficiency.

　　Ni: formed with magnesium Mg2Ni compound, distributed in the form of mesh above the grain boundary, further from the day trip will increase the corrosion of magnesium anode, reducing current efficiency.

　　Cu: Mg with Mg2Cu, or MgCu2, distributed in the grain boundary, increases the self-corrosion of the magnesium anode together to reduce the current efficiency of the anode.

　　Si: the solubility in magnesium is very small, and many times are very green and magnesium formation Mg2Si distribution in the grain boundary and the crystal, and the coexistence of Fe, the increase of magnesium alloy self-dissolving tendency, so that the anode current Efficiency is reduced.

　　Al: high-potential aluminum is a harmful element, it can form a cathode phase with magnesium to speed up the corrosion rate, the presence of aluminum also reduces the solubility of manganese in magnesium.

　　The role of the main elements in the low potential anode: