摘要
针对某生产线生产的3.0 mm厚度SGH440无锌花热基镀锌板折弯脱锌的问题,借助折弯试验机、扫描电镜、辉光放电光谱仪等试验设备重点观察分析了材料断面微观形貌特征和锌层元素分布,并与未脱锌样品进行对比。认为锌层与镀板间未形成连续均匀的Fe_(2)Al_(5)抑制层是样品脱锌的直接原因,而锌层与基板结合处氧元素富集可能是抑制层不良的原因之一。通过认真检查酸洗备料,减少带钢表面残留物质;及时调整加热炉空燃比系数,必要时采取非常规的空燃比系数;按每8 h两次的频率对法兰连接处、焊缝等漏气易发点进行点检;将锌液铝含量由0.18%~0.22%调整为0.19%~0.21%,锌层的粘附性得到有效保证,批量生产的热基镀锌结构钢再未出现折弯脱锌问题,产品质量显著提升。
In order to solve the problem of bending dezincification of 3.0 mm thickness SGH440 non-spangle thermal base galvanized sheet,with the help of bending test machine,scanning electron microscope,glow discharge spectrometer,the cross-section micro-morphology and element distribution of zinc layer were observed and analyzed.It is considered that the formation of continuous and uniform Fe_(2)Al_(5)inhibitor between zinc layer and plate is the direct cause of sample dezincification,and the oxygen enrichment at the junction of zinc layer and substrate may be one of the reasons of poor inhibition layer.Through careful inspection of pickling stock,the residual material on the surface of strip steel can be reduced,and the air-fuel ratio coefficient of heating furnace can be adjusted in time According to the frequency of twice every 8 hours,the gas leakage spots such as flange joint and weld seam were checked,and the content of aluminum in zinc liquid was adjusted from 0.18%~0.22%to 0.19%~0.21%,so the adhesion of zinc layer was effectively guaranteed,the hot-base galvanized structural steel produced in batch production has no problem of dezinc by bending,and the product quality has been greatly improved.
作者
张青
刘需
谷辉格
马占军
陈相东
Zhang Qing;Liu Xu;Gu Huige;Ma Zhanjun;Chen Xiangdong(HBIS Material Technology Research Institute,Shijiazhuang 050000,Hebei;Chengde Vanadiun Titanium New Material Co.,Ltd.,Chengde 067000,Hebei)
出处
《河北冶金》
2022年第10期39-44,共6页
Hebei Metallurgy
关键词
热基镀锌
无锌花
脱锌
折弯
粘附性
抑制层
铝含量
空燃比
hot-base galvanizing
non-spangle
dezincification
bending
adhesion
inhibition layer
aluminum content
air-fuel ratio
