High-temperature batch hot-dip galvanizing .1. General description of coatings formed at 560 degrees C
High-temperature batch hot-dip galvanizing .1. General description of coatings formed at 560 degrees C
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DOI：
10.1016/s0257-8972(96)02941-6
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发表时间：
1997-02-15
影响因子：
5.4
通讯作者：
vanOoij, WJ
中科院分区：
文献类型：
--
作者：
Verma, ARB;vanOoij, WJ
研究了含硅镇静钢的间歇高温热镀锌工艺。冷轧(CRS)和热轧(HRS)结构钢板在560℃，浸泡时间从3到15分钟的商业反应罐中进行了镀锌。涂层的厚度和相分布与浸泡时间或所使用的钢的类型没有很大的关系。在此温度下形成的涂层是完全合金化的。然而，在某些情况下，助熔剂膜似乎抑制了HT-HDG涂层的完全合金化。涂层主要由三角洲合金组成，并含有少量的Zeta和Gamma Ahoy。后者只在锌-钢界面上有少量存在。这些合金涂层的表面由镶嵌在Delta和Zeta合金固溶体中的Zeta合金的小单斜晶组成。这个表面是微孔的。涂层的微孔表面改善了涂层的涂装性能。这些涂层的耐腐蚀性与常规涂层相当，甚至更好。与常规涂层相比，HTHDG涂层的硬度值更高。这种涂层的合金化表面使其适用于磨损和耐磨性非常重要的应用。
The batch high temperature hot-dip galvanizing (HT-HDG) process of silicon-killed steels was studied. Cold-rolled (CRS) and hot-rolled (HRS) structural steel panels were galvanized in a commercial kettle at immersion times ranging from 3 to 15 min at 560 degrees C. The thickness of the coatings and phase distribution was not strongly dependent on the immersion time or the type of steel used. The coatings formed at this temperature were found to be fully alloyed. However, in certain cases the flux film seemed to inhibit the complete alloying of the HT-HDG coatings. The coating consisted primarily of the delta alloy with smaller amounts of the zeta and the Gamma ahoy. The latter was present only in small amounts at the zinc-steel interface. The surface of these alloy coatings consisted of small monoclinic crystals of the zeta alloy embedded in a layer which is a solid solution of the delta and zeta alloy. This surface was microporous. The microporous surface of the coatings enhanced paintability. The corrosion resistance of these coatings was equal if not better than conventional coatings.The hardness values of the HT-HDG coatings was higher compared to the conventional coatings. The alloyed surface of this coating renders it suitable for applications where abrasion and wear resistance are of significant importance.