Method for providing on niobium or niobium-zirconium alloys metal coatings by galvanic etch-plating
Abstract
Abstract A METHOD FOR PROVIDING ON A SUPERCONDUCTIVE METAL, PARTICULARLY NIOBIUM AND ALLOYS OF NIOBIUM AND ZIRCONIUM, A COATING OF A METAL SUCH AS NICKEL, COPPER ZINC, INDIUM, TIN OR GOLD, WITH THIS COATING BEING PROVIDED BY A GALVANIC ETCH-PLATING PROCESS. ACCORDING TO THE METHOD THE BASE METAL WHICH INITIALLY HAS BEEN CLEANED IS ANODICALLY ETCHED IN AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID, AMMONIUM FLUORIDE, AND A FLUORIDE OF THE METAL WHICH IS TO FORM THE COATING. THEN THE POLARITY OF THE CIRCUIT IS REVERSED SO THAT THE METAL IS THEN TREATED IN THE SAME SOLUTION CATHODICALLY. THE REVERSAL OF POLARITY TAKES PLACE WITH SUCH RAPIDITY THAT AN INACTIVATION OF THE EXTERIOR SURFACE OF THE BASE METAL CANNOT OCCUR.
Inventors
- 👤 Gerd Urban
- 👤 Erwin Schmidt
Bibliographic Details
Claims Analysis
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