The influence of galvannealing on the transformation of the sink-roll groove-mark defect was studied by comparing the defects on galvannealed( GA) coating with those on galvanized( GI) coating. It was found that defec...The influence of galvannealing on the transformation of the sink-roll groove-mark defect was studied by comparing the defects on galvannealed( GA) coating with those on galvanized( GI) coating. It was found that defects on GI coating contained high amounts of aluminum,zinc dross,and a zinc-iron intermetallic outburst structure,as well as slight scratches on the substrate. After being galvannealed,the aluminum content was higher and there was a much greater outburst structure,which made the coating of the defect thicker than the normal coating,while the zinc dross and scratches on the substrate had disappeared due to zinc and iron diffusion during the galvannealing process.展开更多
文摘The influence of galvannealing on the transformation of the sink-roll groove-mark defect was studied by comparing the defects on galvannealed( GA) coating with those on galvanized( GI) coating. It was found that defects on GI coating contained high amounts of aluminum,zinc dross,and a zinc-iron intermetallic outburst structure,as well as slight scratches on the substrate. After being galvannealed,the aluminum content was higher and there was a much greater outburst structure,which made the coating of the defect thicker than the normal coating,while the zinc dross and scratches on the substrate had disappeared due to zinc and iron diffusion during the galvannealing process.
