塑性变形导致的镀锌板基体表面粗糙化现象

Surface roughening of substrate of galvanized sheet induced by plastic deformation

以热镀锌板单向拉伸试验为基础,运用化学退镀以及随后的基体表面粗糙度测量和横截面标记观测等试验手段,比较了塑性变形前后基体表面及界面的形貌,得出,塑性变形过程中,基体表面作为界面的一部分会产生粗糙化现象,但这种粗糙化会受到镀锌层的抑制,因此界面并不会出现明显的形貌变化,然而这种基体表面粗糙化所产生的应力,可能导致界面失效。

Based on tensile tests for hot-dipped galvanized sheets, stripping which before the measurement of surface roughness and investigation on marked location of cross sections were used to compare the topography of the substrate surfaces or the coating interfaces before and after plastic deformation. It is found that the substrate surfaces have a trend of roughening during plastic deformation, but the trend is restrained by the zinc coating, and there is no obvious change in interface topography. However, the stress induced by the roughening on substrate surface would effect on interface damage.