Title: Method and apparatus for quick forming phosphate covering film on steel wire
Application Number: 99108935 Application Date: 1999.07.01
Publication Number: 1242439 Publication Date: 2000.01.26
Approval Pub. Date: 2004.08.11 Granted Pub. Date: 2004.08.11
International Classifi-cation: C25D9/10;C25D11/36;C25F1/06
Applicant(s) Name: Nihon Parkerizing K.K. Address:
Inventor(s) Name: Ohayashi Naoyuki;Moriyama Atsutada;Takaki Shigemas
Attorney & Agent: zhang yuanzhong
Abstract:
    Method and appartus suitable for forming promptly a phosphate film of excellent performance for cold drawing on the steel wires are disclosed. The steel wires are descaled by cathodic electrolysis in sulphunc acid solution, and thereafter, phosphate film are formed by cathodic electrolysis on the steel wires. Contacting with the solution containing colloidal titanium are preferable to be carried out between cathodic descaling process and phosphate film forming process. Descaling of cathodic electrolysis may preferably be performed in acid solution at a temperature of lower than 90 DEG C. and in 1~100 A/dm2. Phosphate film forming may preferably be performed by using electrolyte containing Zn ion, phosphoric acid ion and nitric acid ion, at a temperature of lower than 90 DEG C, in 1~100 A/dm2 and for 1~30 seconds.
Time: 6