论文部分内容阅读
研究了电脉冲处理对热镀锌镀层组织和生长影响。采用冷轧钢板在460℃条件下得到不同电脉冲处理参数不同浸镀时间的镀层组织,结果表明,未经电脉冲处理试样铁锌互扩散较快,δ相和ζ相同时生长,且随时间延长ζ相呈起伏式生长,合金层的组织变得不连续且存在疏松。电脉冲处理后试样合金层的生长均受到抑制,生长比较稳定。在180 s浸镀时间内,δ相层的组织晶粒度均匀致密,ζ相的连绵式生长消失,与δ相和η相相界面变得非常连续,厚度明显减薄,由83.5μm减薄到70μm以内。经电脉冲处理后,合金层的生长由扩散和界面反应联合控制转变为仅受扩散控制。
The effects of electric pulse treatment on the microstructure and growth of hot dip galvanized coatings were studied. Cold-rolled steel was used to obtain the coating microstructure with different electric pulse parameters and different immersion time at 460 ℃. The results show that the inter-diffusion of Fe-Zn interphase without electropulsing is rapid and the δ phase and the ζ phase grow at the same time. As the ζ phase grows undulating, the microstructure of the alloy layer becomes discontinuous and loose. After the electric pulse treatment, the growth of the alloy layer was inhibited and the growth was relatively stable. In 180 s immersion time, the grain size of δ phase layer was uniform and compact, the continuous growth of ζ phase disappeared, the interface with δ phase and η phase became very continuous, the thickness was thinner, Within 70μm. After the electric pulse treatment, the growth of the alloy layer was controlled by the combined control of diffusion and interfacial reaction.