A process electroplates a metal workpiece with thin dense chromium. The workpiece is first activated by submerging in an aqueous solution of sulfuric acid and a biflouride salt, preferably ammonium biflouride. The biflouride salt reacts to form HF. A preferred activating bath has a 35% sulfuric acid...http://www.google.fr/patents/US20050211562?utm_source=gb-gplus-shareBrevet US20050211562 - Method for coating joint surfaces of metals used to form prostheses
Method for coating joint surfaces of metals used to form prostheses
