铝基牺牲阳极合金相组成的热力学分析

O. Shcheretskyi, A. Verkhovliuk, D. S. Kanibolotsky
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引用次数: 0

摘要

对镁、锌和铝基牺牲阳极合金的化学成分和相组成进行了文献综述。计算并构建了含铁、硅、铜等不同有害添加剂的铝基牺牲阳极合金的工艺相图。已经确定,铁的有害影响是由于金属间铁的大量夹杂物而使阳极更快地溶解。这种铁的负面影响可以通过几种方式消除:a)最大化熔体冷却速率,这将导致金属间化合物的显著研磨,从而减少其负面影响;b) 合金的高温均匀化以及随后的快速冷却,这将减小铁金属间夹杂物的尺寸;c) 在合金中掺杂额外的锰以将铁结合在三元化合物中,该三元化合物具有与二元金属间化合物不同的形状和尺寸,并且对牺牲阳极合金的负面影响较小。为了消除硅的负面影响,合金必须额外掺杂一定量的镁,以确保硅完全结合。在这种情况下,合金的相组成将对应于AP4合金(%wt.%:(4.0-6.0)Zn)、(0.5-1.0)Mg、(0.05-1.00)Sn、0.10 Si、0.10 Fe、0.01 Cu)。建议在120°C的温度下对合金进行长期热处理,以减少铜对铝基牺牲阳极合金的有害影响。在该处理过程中,几乎所有的铜都可以从铝固溶体进入Al2Cu化合物中。关键词:牺牲阳极合金,铝合金,杂质,工艺相图。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermodynamic analysis of aluminium-based sacrificial anode alloys phase composition
Literature review on magnesium, zinc and aluminum-based sacrificial anode alloys chemical and phase compositions have been performed. Technological phase diagrams of aluminum-based sacrificial anode alloys with different content of harmful additives, such as iron, silicon and copper, have been calculated and constructed. It is determined that the harmful effect of iron is in faster dissolution of the anode due to large inclusions of iron intermetallic. This iron negative effect can be eliminated in several ways: a) maximization of the melt cooling rate, which will lead to significant grinding of the intermetallics and thus reduce their negative impact; b) high-temperature homogenization of the alloy with subsequent rapid cooling, which will reduce the size of the iron intermetallic inclusions; c) doping the alloy with additional manganese to bind iron in ternary compound, which has a different shape and size than the binary intermetallic and has less negative effect on the sacrificial anode alloy. To eliminate the negative effects of silicon, the alloy has to be additionally doped with magnesium in an amount that will ensure the silicon complete binding. In this case, the phase composition of the alloy will correspond the AP4 alloy (% wt.%: (4.0-6.0) Zn), (0.5-1.0) Mg, (0.05-1.00) Sn , ˂ 0.10 Si, ˂ 0.10 Fe, ˂ 0.01 Cu). Long-term heat treatment of the alloy at a temperature of 120 ° C is proposed to reduce the copper harmful effect on the aluminum-based sacrificial anode alloys. Almost all copper can pass from the solid aluminum solution into the Al2Cu compound during this processing. Keywords: sacrificial anode alloys, aluminum alloys, impurities, technological phase diagrams.
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