摘要
炼制了4种不同硅含量(0.04%,0.09%,0.14%和0.36%Si)而其他成分相同的钢,研究了450,480℃下其镀层生长及组织变化,探讨了Sebisty现象的形成原因。结果表明,4种含硅钢的镀层生长呈现出典型的Sandelin效应;当锌浴温度从450℃升高到480℃时,0.04%,0.09%和0.36%Si钢镀层的合金层厚度增加,而0.14%Si钢镀层的合金层厚度减小,呈现出Sebisty现象。利用扫描电镜和电子探针在高倍率下观察了钢基/镀层界面的组织特征后发现,0.14%Si钢镀锌层减薄的原因是Г层由不连续(450℃)变为较连续且厚度小于0.5μm的一层(480℃),而连续的Г层的存在会减缓Fe-Zn反应的速度,导致合金层减薄。
Four steels with same chemical elements except silicon content(0.04%,(0.09)%,0.14% and(0.36)%Si) were prepared,and worked in molten zinc at 450 ℃ and 480 ℃ for different times.The microstructures of hot dip galvanized coatings were analyzed,and the formation of Sebisty phenomenon was discussed.The results show that the coating growth displays typical Sandelin effect.With increasing zinc bath temperature from 450 ℃ to 480 ℃,the Fe-Zn alloy layer thickness of three steels(0.04%,0.09% and(0.36)%Si) increases,but that of 0.14%Si steel falls,which is known as Sebisty phenomenon.The steel substrate/coating interface was observed using SEM and EDS under high magnification.The thinning of galvanized coating on 0.14%Si steel is due to the Г layer changes from discontinuous to thin(less than 0.5μm) as the zinc bath temperature raises from 450 ℃ to 480 ℃,and relatively continuous Г layer can delay the reaction of Fe and Zn so that decrease the thickness of Fe-Zn alloy layers.
出处
《材料保护》
CAS
CSCD
北大核心
2005年第11期28-30,共3页
Materials Protection
