Abstract: Parallel convex strip defect at surface of hot galvanized steel plate ( % : 0.001 5 C, 0. 004P, 0. 005S, 0. 02A1, 0. 04Ti) has been studied by SEM and EDS, and it was obtained that the defect included black spot, microcrack, conchiform pattern, scratch trace and scale. Analyzed results showed that higher Sb content in galvanizing solution to increase brittleness of galvanized layer, higher Al content in galvanizing solution and lower temperature of solution, and retaining scratch defect and un-removed scale led to formation of surface defect of galvanized plate.

Key words: Hot Galvanizing Process, Plate Surface Defect, Analysis

摘要： 用扫描电镜和能谱分析研究了热镀锌板(%:0.001 5C、0.004P、0.005S、0.02A1、0.04Ti)表面平行的条状凸起缺陷,得出镀锌层表面有黑斑、微裂纹、贝壳状花纹、划伤痕迹及氧化皮等缺陷。分析表明,锌液中Sb含量偏高,增加锌层脆性;锌液中Al含量偏高,锌液温度低,以及镀锌前钢板划伤和氧化铁清洗不完全导致产生表面缺陷。

关键词: 热镀锌工艺, 钢板表面缺陷, 分析