| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming a surface treating film excellent in corrosion resistance, finish performance and the stability of a film forming agent. SOLUTION: In the method for forming the coating film by applying the film-forming agent onto a metal substrate by at least two-stage electricity applying system: (i) the film-forming agent comprises 30-20,000 ppm, in terms of the total amount of metal (as converted to mass) of zirconium compound and, where necessary, a compound containing at least one metal (a) which is selected from titanium, cobalt, vanadium, tungsten, molybdenum, copper, zinc, indium, aluminum, bismuth, yttrium, lanthanide metals, alkali metals and alkaline earth metals, and 1-40% by mass of an anionic group-containing resin component; (ii) the first stage coating is conducted, in the state that the metal substrate is immersed in the film-forming agent, by applying electricity at a voltage of 1-50 V for 10-360 seconds, using the metal substrate as the cathode; and (iii) the second and subsequent stage coating is conducted, in the state that the metal substrate is immersed in the film-forming agent, by applying electricity at a voltage of 50-400 V for 60-600 seconds, using the metal substrate as the anode. COPYRIGHT: (C)2008,JPO&INPIT
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