根据镀锌卷表面黑斑的形貌,分析认为:由于镀锌卷卷取张力偏小,导致长距离运输时镀锌卷层间易产生摩擦,致使部分镀锌层脱落,基层继而被氧化,而形成表面黑斑。 According to the appearance of the dark spots on the surface of galvanized coil, the analysis shows that: due to the tension of the galvanized coil is too small, friction between the galvanized coils tends to occur during long-distance transportation, resulting in partial galvanized layer falling off, The formation of surface dark spots.