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Zn - 5 %Al-RE合金镀层既有铝元素把钢基与环境分隔的屏障保护作用 ,又有锌元素优异的电化学防护性能 ,在各种大气中的抗蚀能力是同厚度热镀锌层的 2～ 3倍 ,其加工成型性、涂挂性优于热镀锌层。这种合金的熔点只有 382℃ ,比锌的熔点低 37 5℃ ,热镀温度在 42 0～ 45 0℃之间。因此较钢丝的热镀锌能耗低 ,且可保持有镀锌钢丝同样的力学性能 ,从而是取代镀锌钢丝及其制品的理想产品。本文介绍这种镀层钢丝的合金成分、显微组织、热浸镀工艺和装备、耐腐蚀机理和国内开发应用状况
Zn - 5% Al-RE alloy coating has both the barrier effect of separating the steel base from the environment and the excellent electrochemical protection of zinc element. The corrosion resistance in various atmospheres is the same as the thickness of hot dip galvanized Layer 2 to 3 times its processing formability, Tu coating is better than hot-dip galvanizing layer. The melting point of this alloy is only 382 ℃, 375 ℃ lower than the melting point of zinc, hot-dip temperature between 42 0 ~ 45 0 ℃. Therefore, the hot dip galvanization of steel wire is less energy-consuming, and can maintain the same mechanical properties of galvanized steel wire, which is an ideal substitute for galvanized steel wire and its products. This article describes the composition of this coated steel wire alloy, microstructure, hot dip coating process and equipment, corrosion resistance and development of domestic applications