Title: Surface protection process for gold, silver coin and medal
Application Number: 200410016793 Application Date: 2004.03.08
Publication Number: 1667160 Publication Date: 2005.09.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C25D11/38,A44C21/00
Applicant(s) Name: China Banknote Printing and Minting Corporation Address: 100044
Inventor(s) Name:
Attorney & Agent: li gaodong
Abstract:
     The invention relates to surface protection technology for gold or silver coin and seal. The feature is that: hanging the product, removing oil by ultrasonic, the first pulverization spraying washing, rinsing, removing oil by electrolyzing, the second pulverization spraying washing, the first counter-flow wash, passivation by electrolyzing, the third pulverization spraying washing, the second counter-flow wash, the third counter-flow wash, dipping to form protection film, drying by hot air, and taking down the product. Thus, the surface of gold or silver coin and seal would be effectively protected.
Time: 10
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