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钢板表面的锌镁合金镀层可以提高其耐腐蚀性能,而锌镁金属间化合物MgZn2和Mg2Zn11的形成可能是耐腐蚀性能提高的主要因素。本文在镀锌钢板表面采用真空热蒸发镀镁,并由快速退火工艺形成锌镁合金镀层,进而研究退火条件对形成锌镁合金镀层的影响,即通过改变退火温度和时间,得到不同的合金成分,然后通过X射线衍射分析退火条件对合金成分的影响。研究表明,退火温度较低时,不会形成锌镁合金;退火温度越高,形成的锌镁合金相越多,合金化程度越高;退火温度过高会导致铁锌合金相生成。退火时间对合金化也有类似规律。
The zinc-magnesium alloy coating on the steel surface can improve its corrosion resistance, and the formation of Zn-Mg intermetallic compounds MgZn2 and Mg2Zn11 may be the main factor of improving the corrosion resistance. In this paper, the surface of galvanized steel by vacuum thermal evaporation magnesium, and rapid annealing process to form a zinc-magnesium alloy coating, and then study the annealing conditions on the formation of zinc-magnesium alloy coating, that is, by changing the annealing temperature and time to get different alloy composition Then, the effect of annealing conditions on the alloy composition was analyzed by X-ray diffraction. The results show that when the annealing temperature is low, no zinc-magnesium alloy is formed; the higher the annealing temperature, the more the zinc-magnesium alloy phase is formed and the higher the alloying degree; and the high annealing temperature leads to the formation of the iron-zinc alloy phase. Annealing time alloying similar rules.