摘要
针对热镀锌钢板表面亮点缺陷,采用金相显微镜、扫描电镜对其微观形貌及微区元素进行了研究分析。结果表明,亮点处存在明显的凹坑,常见的有圆形、椭圆形、长条形3种微观形貌,缺陷区域有铁元素富集现象,且抑制层已有部分破碎,较薄的抑制层促使脆性Fe-Zn相的产生,降低了缺陷区域锌层的附着性。结合现场具体情况,对来料因素、退火炉区域、锌锅区域、光整区域等进行了排查分析,发现亮点缺陷与锌渣在带钢表面的黏附与脱落有关,调整气刀工艺参数可使缺陷有所改善。
By using the optical microscope and scanning electron microscope,the microelements and micromorphology of the surface bright spot of hot galvanized steel sheet were analyzed.The results showed that there were pits on the surface bright spot,which had three micromorphologies of the round,oval and elongated,and Fe element enrichment at the defect.Parts of the inhibition layer were broken,and the thinner inhibition layer promoted the generation of brittle Fe-Zn phase and decreased the adhesion of the zinc layer in the defect region.Combined with the specific circumstances,the material factors,annealing furnace,zinc pot area,and finishing area were investigated.The results showed that the spot defects were related to the adhesion and detachment of cadmia on the steel strip surface,and adjusting the technological parameters of the gas knife can improve the defect.
作者
李伟刚
赵云龙
王滕
周忠臣
钱鑫
LI Wei gang1 , ZHAO Yun-tong1 , WANG Teng1 , ZHOU Zhong-chen1 , QIAN Xin2(1. Technology Center ,Ma anshan Iron and Steel Co. , Ltd. , Ma＇anshan 243000, Anhui, China;2. Cold Rolling General Plant, Ma＇anshan Iron and Steel Co. , Ltd. , Ma＇anshan 243000, Anhui, China)
出处
《中国冶金》
CAS
北大核心
2018年第10期46-50,共5页
China Metallurgy
基金
国家重点研发计划资助项目(2017YFB0304300,2017YFB0304305)
关键词
热镀锌
亮点缺陷
凹坑
锌渣
hot galvanized
bright spot defect
pit
cadmia
