Title: Passivating process for surface of copper and its alloy
Application Number: 86103910 Application Date: 1986.06.02
Publication Number: 1015289 Publication Date: 1987.12.16
Approval Pub. Date: Granted Pub. Date: 1993.05.05
International Classifi-cation: C23C22/73,C23C22/78,C23F3/06
Applicant(s) Name: MetalCorrosion and Protection Inst. of CAS Address:
Inventor(s) Name:
Attorney & Agent: TA XIANZHI
Abstract:
     This invention is characterized by: (1) dilute chromic acid treatment is performed after bright acid dipping (polishing) procedure; (2) the concn. of oxalic acid polishing solution is doubled; besides, a phosphoric acid polishing solution which offers very high polishing efficiency is provided; (3) passivation film-forming (treatment) is the combined treatment by a mixt. of benzotriazole and polyvinyl alcohal. It is a passivating technology providing ideal protective films with neither polluting environment nor impairing operator's health.
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