Electrodeposition system and electrodeposition method

An electrodeposition system comprising:

• an electrodeposition zone in which an object to be coated is immersed in a coating material solution for electrodeposition so that a coating is formed on a surface of the object to be coated;
• a washing zone in which the coated object having the coating formed on the surface thereof in the electrodeposition zone is washed using washing water;
• and
• a drying zone in which the coated object washed in the washing zone is heated so that the coating of the coated object is hardened and dried,
• wherein the washing zone is provided with at least:
• a hot water washing tank in which the coated object is washed by being immersed in high-temperature washing water in the hot water washing tank;
• and
• a spray washer that sprays first and second kinds of steel plate mating portions of the coated object with high-temperature washing water, subsequent to washing in the hot water washing tank,
• wherein the spray washer is provided with spray ports and curving spray tubes to spray a corresponding kind of the steel plate mating portion of the coated object with the high-temperature washing water, and
• wherein the spray ports are for spraying, with high-temperature washing water, a first kind of steel plate mating portion which is parallel to the direction in which the coated object is conveyed, arranged to include two adjacent spray ports, including an upstream-side spray port positioned upstream and a downstream-side spray port positioned downstream in the direction in which the coated object is conveyed being arranged at an interval that
• continuously sprays the first kind of steel plate mating portion with the high-temperature washing water from the upstream-side spray port and sprays the first kind of steel plate mating portion with the high-temperature washing water from the downstream-side spray port as the coated object is conveyed,
• wherein the curved spray tubes comprise nozzles for spraying a second kind of steel plate mating portion which is angled relative to the direction in which the coated object is conveyed with high-temperature washing water, the curved spray tubes are arranged in the direction in which the coated object is conveyed and the nozzles are arranged parallel to the second kind of steel plate mating portion, and
• the spray washer is provided with a plurality of curved spray tube sets which are arranged in the direction in which the coated object is conveyed, the sets comprise a plurality of the nozzles which are parallel to the second kind of steel plate mating portion.