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首页> 外文期刊>Metals and Materials International >Surface and Cut-edge Corrosion Behavior of Zn-Mg-Al Alloy-Coated Steel Sheets as a Function of the Alloy Coating Microstructure
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Surface and Cut-edge Corrosion Behavior of Zn-Mg-Al Alloy-Coated Steel Sheets as a Function of the Alloy Coating Microstructure

机译：Zn-Mg-Al合金涂层钢板的表面和尖端腐蚀行为与合金涂层组织的关系

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摘要

The effects of Mg and Al content on the microstructure and corrosion resistance of hot-dip Zn-Mg-Al alloy-coated steel sheets were investigated. Pure Zn and Zn-based alloy coatings containing Mg (0-5 wt%) and Al (0.2-55 wt%) were produced by a hot-dip galvanizing method. Mg and Al addition induced formation of intermetallic microstructures, like primary Zn, Zn/MgZn2 binary eutectic, dendric Zn/Al eutectoid, and Zn/Al/MgZn2/ternary eutectic structures in the coating layer. MgZn2-related structures (Zn/MgZn2, Zn/Al/MgZn2, MgZn2) played an important role in increasing the corrosion resistance of Zn-Mg-Al alloy-coated steel sheets. Zn-3%Mg-2.5%Al coating layer containing a large volume of lamellar-shaped Zn/MgZn2 binary eutectic structures showed the best cut-edge corrosion resistance. The analysis indicated that Mg dissolved from MgZn2 in the early stage of corrosion and migrated to the cathodic region of steel-exposed cut-edge area to form dense and ordered protective corrosion products, leading to prolonged cathodic protection of ZnMg-Al alloy-coated steel sheets.
机译：研究了Mg和Al含量对热浸Zn-Mg-Al合金涂层钢板的组织和耐蚀性的影响。通过热浸镀锌法生产包含Mg（0-5 wt％）和Al（0.2-55 wt％）的纯Zn和Zn基合金涂层。镁和铝的添加导致金属间组织的形成，如涂层中的原生锌，Zn / MgZn2二元共晶，树枝状Zn / Al共析金属和Zn / Al / MgZn2 /三元共晶结构。 MgZn 2相关结构（Zn / MgZn 2，Zn / Al / MgZn 2，MgZn 2）在提高Zn-Mg-Al合金涂层钢板的耐腐蚀性中起着重要作用。含有大量层状Zn / MgZn2二元共晶结构的Zn-3％Mg-2.5％Al涂层表现出最佳的耐尖端腐蚀性能。分析表明，Mg在腐蚀初期从MgZn2中溶解并迁移到暴露于钢的尖端区域的阴极区域，形成致密且有序的保护腐蚀产物，从而延长了对ZnMg-Al合金涂层钢的阴极保护。床单。

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