The effect of magnesium additions on the microstructure and cut edge corrosion resistance of zinc aluminium alloy galvanised steel
The effect of magnesium additions on the microstructure and cut edge corrosion resistance of zinc aluminium alloy galvanised steel
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DOI：
10.1016/j.corsci.2008.02.005
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发表时间：
2008-06-01
影响因子：
8.3
通讯作者：
Worsley, David A.
中科院分区：
文献类型：
--
作者：
Elvins, Jonathan;Spittle, John A.;Worsley, David A.
在连续镀锌条件下施加到0.7 mm规格钢上的20 μ m厚4.5%Al/Zn镀锌涂层中的镁水平从0.0%改变到0.05%。添加导致锌枝晶的增加（体积分数从6%到22%，数量从150到325 mm（-2）），因为镁降低共晶温度，增加凝固范围。显微结构的修改结果在增加切割边缘腐蚀确定使用扫描振动电极技术为24小时暴露于5%NaCl。Mg的加入导致锌损失增加（从80 μ g增加到185 μ g），活性阳极数量增加（从600到1700 m（-1）切割边缘）和长寿命阳极数量增加。(C)2008爱思唯尔有限公司保留所有权利。
The magnesium levels in 20 mu m thick 4.5% Al/Zn galvanising coatings applied to 0.7 mm gauge steel under continuous galvanising conditions were altered from 0.0% to 0.05%. The additions result in an increase in the zinc dendrites (volume fraction from 6% to 22% and number from 150 to 325 mm(-2)) since magnesium depresses the eutectic temperature increasing the freezing range. The microstructural modification results in increasing cut edge corrosion determined using a scanning vibrating electrode technique for 24 h exposure to 5% NaCl. The Mg additions result in an increase in zinc loss (from 80 to 185 mu g), an increase in active anode numbers (from 600 to 1700 m(-1) cut edge) and an increase in the number of long lived anodes. (C) 2008 Elsevier Ltd. All rights reserved.