ANALYSIS AND RESEARCH ON TYPICAL ZINC LEAKAGE DEFECTS OF A FLOWER FREE GALVANIZED SHEET
Zinc Leakage is one of the most common defects of galvanizing.There are many factors affecting the defects of leakage plating.The common reasons include:raw material pollution,insufficient reduction,poor sealing of the furnace,too high oxygen content,zinc dross pressing,and furnace roller nodules,etc.This article analyzes a sudden zinc Leakage on a production line,and uses SEM and EDS for composition detection.Based on the on-site production situation,it is determined that the leakage plating defect is caused by the detachment and fragmentation of the refractory material in the NOF section.Under the complex gas flow field in the furnace,dust resistant materials adhere to the surface of the strip steel resulting in the leakage plating defect.Through measures such as cleaning inside the furnace,repairing broken refractory materials,and reasonable transition of strip steel,the occurrence of this defect has been effectively suppressed,and the surface quality has been improved.
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