Wetting behavior of eutectic Al–Si droplets on zinc coated steel substrates
Wetting behavior of eutectic Al–Si droplets on zinc coated steel substrates
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DOI：
10.1016/j.jmatprotec.2013.08.005
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发表时间：
2014
影响因子：
6.3
通讯作者：
M. Gatzen;T. Radel;C. Thomy;F. Vollertsen
中科院分区：
文献类型：
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作者：
M. Gatzen;T. Radel;C. Thomy;F. Vollertsen
研究了不同热浸镀层和电镀锌层的瞬态扩展行为、接头性能和冶金成分。主要关注涂层厚度和液滴尺寸的影响。虽然大多数液滴是在室温下在表面上观察到的，但也考虑了预热基材的情况。与预热或不存在涂层的影响相比，涂层厚度和液滴尺寸对所得润湿角的影响很小。不同涂层类型的瞬态铺展行为显着不同。涂层厚度影响润湿初始阶段向基材的热传递。冶金成分表明，涂层在广泛的界面区域上被去除，而它很可能由于流体动力学效应而积聚在沉积的钎焊金属的趾部处。
Transient spreading behavior, joint properties and metallurgical compositions are investigated for different hot-dip and electro-galvanized zinc coatings. The main focus is set on the effect of coating thicknesses and droplet size. While most of the droplets are observed on surfaces at room temperature, the case of pre-heated substrates is also accounted for. Both the coating thickness and the droplet size have little effect on the resulting wetting angle compared to the effect of preheating or the absence of a coating. The transient spreading behavior significantly differs for different coating types. The coating thickness affects heat transfer into the substrate during the initial stage of wetting. The metallurgical composition shows that the coating is removed over a broad interfacial area, while it accumulates at the toe of the deposited braze metal most likely due to fluid dynamic effects.