WATER WASHING METHOD OF METAL FORMED PRODUCT

PROBLEM TO BE SOLVED: To provide a water washing method of metal formed products by which the process length from the process to carry out chemical conversion of metal formed products to the process to carry out electrodeposition coating can be shortened and which has high cleaning power. SOLUTION: This water washing method of metal formed products is to be carried out after a chemical conversion process of metal formed products and before an electrodeposition coating process and includes a mist spraying water washing process (1), a mist spraying water washing process (2) to discharge water after washing to the outside of the system, a mist spraying water washing process (3) to recover water after washing and use the recovered water as water before washing for the process (1) and as water before washing for the process (2), an immersion water washing process (4) to use the water after washing as water before washing for the process (3), a mist spraying water washing process (5), and a mist spraying water washing process (6) which is a mist spraying water washing process to recover water after washing in order to use the recovered water as water before washing for the process (5) and in which clean water is used as the water before washing. The quantity of the water before washing to be used for the process (1) is an extremely slight amount as compared with the quantity of the water before washing to be used for the process (2).