| 摘要 |
PURPOSE:To stabilize the flow of a surface treatment solution and also to discharge impurities in the treatment solution out of a tank, by providing a passage starting from the outside peripheral part of the bottom plate of a tank body and having an opening in the position lower than the upper end of the tank body along the outside wall of the tank body. CONSTITUTION:A passage 13 starting from the outside peripheral part of the bottom plate 3 of a tank body 4 and having an opening in a position lower than the upper end 6 of the tank body 4 is provided along the outside wall of the tank body. When a surface treatment solution 2 is fed from an inlet hole 1 into the above construction, the greater part of the surface treatment solution 2 is allowed to rise through the tank body 4 to perform the surface treatment of a material 7 to be treated. On the other hand, the surface treatment solution 2 introduced into the passage 13 is allowed to rise and discharged directly into an overflow part 5, and, since the opening of this passage 13 is located in the position lower than the upper end 6, the difference in height between the opening and the upper end 6 becomes the pushing-up pressure in the passage 13. By this method, metallic fine grains, dust, etc., contained in the surface treatment solution 2 are allowed to fall by gravity from the tank body 4 onto the bottom plate 3 and discharged out of the tank via the passage 13 and a return pipe 12, so that deterioration of the surface treatment solution 2 can be prevented.
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