MANUFACTURING METHOD FOR SURFACE-TREATED METALLIC SUBSTRATE AND SURFACE-TREATED METALLIC SUBSTRATE OBTAINED BY SAID MANUFACTURING METHOD, AND METALLIC SUBSTRATE TREATMENT METHOD AND METALLIC SUBSTRATE TREATED BY SAID METHOD

摘要

Disclosed is a manufacturing method for a metallic substrate of superior corrosion resistance and finishing properties and the surface-treated metallic substrate obtained by said manufacturing method, and a surface treatment method that provides a metallic substrate of superior corrosion resistance and finishing properties and the metallic substrate surface-treated by said method. Concretely, this is a manufacturing method for surface-treated metallic substrate that includes a step in which a metallic substrate is immersed as a cathode in a treatment solution (I) described below and electrical conduction is applied for 10 to 600 seconds by superimposing an alternating current (Va) at a frequency of 0.1 to 1000 Hz and 1 to 40 V peak-to-peak voltage onto a direct current (Vd) at a voltage of 1 to 50 V. The treatment solution (I) comprises a metallic compound ingredient (A) containing a compound of at least one metal (a) selected from a group consisting of zirconium, titanium, cobalt, vanadium, tungsten, molybdenum, copper, zinc, indium, bismuth, yttrium, iron, nickel, manganese, gallium, silver, and lanthanoid metals, and water, and the content of metallic compound ingredient (A) is 5 to 20,000 ppm as the total metallic quantity (by mass).