Method of electrolitic descaling activating and brightening and plating titanium and its alloys

Abstract

Abstract HONEYCOMB SANDWICH PANEL STRUCTURES FORMED OF TITANIUM AND ITS ALLOY ARE PREPARED FOR ELECTROPLATING AND SUBSEQUENT BRAZING-DIFFUSION BONDING BY SUBJECTING THE SAME TO A SERIES OF BATHS, ALL OPERATED AT AMBIENT ROOM TEMPERATURE. THE PANEL PARTS ARE FIRST CLEANED BY IMMERSION FOR 1-5 MINUTES IN A NON-AQUEOUS CHROMIC-SULFURE ACID BATH TO REMOVE MILL MARKS, FINGERPRINTS, AND OTHER SURFACE CONTAMINANTS. THE PAERTS ARE NEXT DESCALED TO REMOVE OXIDES BY IMMERSION FOR 5-10 MINUTES IN AN NONAQUEOUS ACETIC-SULFURIC-HYDROFLUORIC ACID BATH WHICH IS THE ELECTROLYTE IN AN ELECTROLYTIC SYSTEM IN WHICH IS TITANIUM PART IS THE ANODE AND THE CATHODE ELECTRODE IS FORMED OF CARBON OR COPPER. FROM 2-3 VOLTS ARE APPLIED ACROSS THE ELECTRODES IN DESCALING THE PANEL FACING SHEETS, AND FROM 4-5 VOLTS ARE USED IN DESCALING THE HONEYCOMB CORE WHICH IS ACTIVATED BY THIS TREATMENT AND THEREBY PREPARED FOR ELECTROPLATING TO RECEIVE ONE OR MORE PLATING LAYERS OF DIFFERENT METALS, THE ACTIVATED PARTS ARE BRIGHTENED BY IMMERSION FOR 1-5 MINUTES IN AN AQUEOUS NITRICBORIC-HYDROFLUORIC ACID BATH.

Inventors

• 👤 E Kendall

Bibliographic Details