冷轧热镀锌板表面条形缺陷的分析及形成原因探讨

发布时间：2018-07-29 19:53

【摘要】：采用激光诱导击穿光谱原位统计分布分析技术(LIBS-OPA)、扫描电镜结合能谱仪(SEM/EDS)对冷轧热镀锌板表面条形缺陷处的元素进行了分布分析,并探讨了缺陷的形成原因。使用激光诱导击穿光谱原位统计分布分析技术对镀锌板表面进行了面扫描,扫描区域包含镀锌板表面的条形缺陷,并作出铝、铬、钙、碳、铁、硅、铜、锰、钠、镁、钾和锌等12种元素的强度二维分布图及线分布图,结果表明在缺陷中心处,锌和钾的含量比正常部位低,铝、碳、钙、铬、铜、硅、锰、钠、镁等元素在缺陷中心处的含量比正常部位高;在缺陷中心的两侧,铁、铝2种元素存在两条断续的高含量带,碳元素存在两条低含量带。同时,用扫描电镜与能谱仪对镀锌板表面正常部位和缺陷部位进行线扫描和定量分析,结果表明在缺陷部位,碳、氧、铝3种元素的含量明显比正常部位高,锌的含量比较低,而钙和钾含量变化表现不明显。SEM/EDS结果与LIBS-OPA检测结果一致,将两种手段的检测结果对比分析,得知缺陷部位所含成分主要为氧化钙和氧化铝,由此推测缺陷可能是由保护渣夹杂所致。激光诱导击穿光谱原位统计分布分析为缺陷的分析鉴定提供了新的测试方法,对镀锌板生产工艺的改进具有指导意义。
[Abstract]:In situ statistical distribution analysis (LIBS-OPA) of laser induced breakdown spectroscopy (LIBS-OPA) and scanning electron microscopy (SEM/EDS) were used to analyze the distribution of elements at the defects on the surface of hot-dip galvanized cold rolled sheet. The causes of the defects were also discussed. The laser induced breakdown spectroscopy in situ statistical distribution analysis technique was used to scan the surface of galvanized sheet. The scanning area contains strip defects on the surface of galvanized sheet, and the aluminum, chromium, calcium, carbon, iron, silicon, copper, manganese, sodium, magnesium, aluminum, chromium, calcium, carbon, iron, silicon, copper, manganese, sodium, magnesium, etc. The results show that the contents of zinc and zinc are lower than normal at the center of defects, aluminum, carbon, calcium, chromium, copper, silicon, manganese, sodium, etc. The content of magnesium and other elements in the defect center is higher than that in the normal part, and there are two discontinuous high content bands for iron and aluminum elements and two low content bands for carbon element on both sides of the defect center. At the same time, scanning electron microscope and energy spectrometer were used to scan and analyze the normal and defective parts of galvanized sheet. The results showed that the contents of carbon, oxygen and aluminum in the defect area were obviously higher than those in the normal part, and the content of zinc was relatively low. The changes of calcium and potassium contents were not obvious. The results of SEM / EDS were consistent with those of LIBS-OPA. By comparing and analyzing the results of the two methods, it was found that the main components of the defects were calcium oxide and alumina. It is inferred that the defect may be caused by the inclusion of mold slag. The in-situ statistical distribution analysis of laser induced breakdown spectrum provides a new testing method for the analysis and identification of defects, which is of guiding significance to the improvement of the production process of galvanized sheet.
【作者单位】：北京科技大学化学与生物工程学院;钢研纳克检测技术有限公司;北京科技大学冶金与生态工程学院;酒泉钢铁(集团)有限责任公司;
【基金】：国家重大科学仪器设备开发专项(科13140130)
【分类号】：TG335.12;TG115

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