METHOD OF PRODUCING SURFACE-TREATED STEEL SHEET

摘要

A method of producing a surface-treated steel sheet is provided. The method has a step of performing electrolytic treatment thereby to form a layer including a metal-oxygen compound on a surface of a steel sheet. The electrolytic treatment is performed so that the steel sheet is continuously fed into electrolytic treatment baths each including a treatment liquid and an electrode. The treatment liquid contains metal ions. The method is characterized in that: rolls provided for each of the electrolytic treatment baths (a roll for feeding the steel sheet into the electrolytic treatment bath and a roll for feeding the steel sheet out of the electrolytic treatment bath) comprise an energized roll that is electrically connected to a power source for flowing a direct current through the steel sheet and a non-energized roll that is not connected to a power source; and the energized roll is arranged such that, once the metal-oxygen compound has been formed by electrolytic treatment on a surface of the steel sheet to be in contact with the rolls, the metal-oxygen compound and the energized roll are not in contact with each other so as not to generate an arc spot.

主权项

1. A method of producing a surface-treated steel sheet, the method comprising performing electrolytic treatment using an electrolytic treatment apparatus thereby to form a layer including a metal-oxygen compound on a surface of a steel sheet,
the electrolytic treatment apparatus having electrolytic treatment baths each comprising a treatment liquid and at least one electrode, the treatment liquid containing metal ions, the electrolytic treatment being performed in each of the electrolytic treatment baths by continuously feeding the steel sheet into each of the electrolytic treatment baths and flowing a direct current between the steel sheet and the electrode, wherein: the steel sheet is continuously fed by rolls into each of the electrolytic treatment baths, the rolls comprising a roll for feeding the steel sheet into the electrolytic treatment bath and a roll for feeding the steel sheet out of the electrolytic treatment bath, both of the rolls being provided for each of the electrolytic treatment baths; the rolls provided in the electrolytic treatment apparatus comprise an energized roll that is electrically connected to a power source for flowing a direct current through the steel sheet and a non-energized roll that is not connected to a power source; and the energized roll is arranged such that, once the layer has been formed by electrolytic treatment on a surface of the steel sheet to be in contact with the rolls, the layer and the energized roll are not in contact with each other so that an arc spot is prevented from occurring.