摘要：钢铁材料是应用最广泛的金属材料，但是其最显著的缺点是在大气中会与氧及水蒸汽等发生反应而受到腐蚀。每年世界上都有相当于年产量百分之三十的金属制品因为腐蚀而报废。随着人类在海洋，航空等领域的不断发展，对耐蚀镀层材料的要求也就越来越高。因此，必须寻求经济而有效的金属制品防护方法来保证金属制品的耐腐蚀性能，延长使用寿命。合金化是改善其组织与性能的主要方法。
本文采用扫描电镜、金相显微镜以及能谱仪等手段，研究了合金元素硅、钛对热浸镀Zn-30%Al合金镀层生长的影响。实验研究表明：
在Zn-30%Al熔池中加入1.0%的硅可以减缓铁铝之间的放热反应，有效减薄镀层厚度；随着合金元素钛的加入，改变铁铝界面生成合金相的种类。硅、钛的协同作用能进一步减薄镀层，加入0.2%Ti时效果较好。
Zn-30%Al合金浴得到的镀层成分为FeAl3，Zn-30%Al-1.0%Si合金浴得到的镀层成分为τ5。
Zn-30%Al-1.0%Si合金镀层在300s时，开始在τ5H相上出现τ5C相，600s时才出现τ1相。600s时，合金层的成分达到稳定为：(Fe2Al5+τ1)/ FeAl3/(τ5H +τ5C)。
合金镀层在0-60s之间硅元素对镀层的生长有明显的抑制作用，合金镀层在60s-1200s之间硅元素的抑制作用减弱。
Zn-30%Al-1.0%Si-x%Ti合金镀层在反应180s后，镀层最终组织稳定已经稳定，与Zn-30%Al-1.0%Si合金镀层最终稳定组织相同。在反应初始阶段反应速度最快，反应一段时间后逐渐减慢。
关键词：热浸镀，锌铝合金镀层，硅，硅钛协同作用，生长动力学
Abstract:The steel material is the most widely used metallic materials, but the most significant shortcomings in the atmosphere with oxygen and water vapor react by corrosion. The world each year, equivalent to the annual output of 30 per cent of metal products corrosion scrapped. With the continuous development of human beings in the marine, aviation and other fields, is getting higher and higher requirements for corrosion resistant coating materials. Therefore, we must seek economical and effective protection of metal products to ensure the corrosion resistance of the metal products, extended service life.
In this paper, Using scanning electron microscope, metallurgical microscope and energy dispersive spectroscopy was studied by means of alloying elements silicon and titanium on the growth of hot dip Zn-30% Al alloy coating. Experimental studies have shown that:
Can slow exothermic reaction between the Fe-Al-Zn-30% Al bath in 1.0% of silicon, effective thinning coating thickness; With the addition of alloying elements titanium, change the type of Fe-Al interface generation alloy phase. Silicon, titanium synergistic effect can be further thinned coating, adding 0.2% Ti better. Zn-30% Al alloy coating composition bath FeAl3, Zn-30% Al-1.0% Si alloy bath coating composition τ5. Zn-30% Al-1.0% Si alloy coating in the 300s, began to appear in the τ5H phase τ5C phase 600s when τ1 phase. 600s, the composition of the alloy layer: (Fe2Al5 +τ1) / FeAl3 / (τ5H +τ5C).Alloy coating of silicon between the 0-60s on the growth of the coating significantly inhibited the alloy coating silicon element in the 60s-1200s between the inhibition diminished. Zn-30% Al-1.0% Si-x% Ti alloy plating reaction 180s after plating the final organizational stability has stabilized, and Zn-30% Al-1.0% Si alloy coating eventually stabilize and organize the same. The fastest speed in the initial reaction stage of the reaction gradually slowed down after a period of reaction.
Keywords:Hot dip, zinc-aluminum alloy coating, silicon, silicon titanium synergy, growth kinetics
