Solderable stainless steel

Abstract

Abstract MEANS AND METHOD FOR RENDERING SOLDERABLE A STAINLESS STEEL BODY RESISTANT TO CORROSIVE ATTACK FROM COMMON ELECTROYTES. THE METHOD INCLUDES THE STEPS OF COVERING AT LEAST ONE SURFACE OF A STAINLESS STEEL BODY WITH LAYERS OF METAL INCLUDING A FIRST METAL LAYER SELECTED FROM THE GROUP CONSISTING OF NICKEL, COBALT AND CHROMIUM WHICH SERVES AS A BARRIER LAYER TO THE DIFFUSION OF A SUBSEQUENT METAL LAYER OR LAYERS THERETHROUGH TO THE STAINLESS STEEL BODY. THE SUBSEQUENT METAL LAYER IS RESISTANT TO CORROSIVE ATTACK FROM COMMON ELECTROLYTES AND IS SOLDERABLE. THE SUBSEQUENT METAL LAYER CONSISTS OF SILVER ALLOYED WITH A NOBLE METAL SELECTED FROM THE GROUP CONSISTING OF GOLD, PALLADIUM, PLATINUM, RHENIUM AND OSMIUM. THE ALLOY LAYER MAY BE FORMED BY COVERING THE BARRIER LAYER WITH A LAYER OF SILVER AND THEN A LAYER OF GOLD OR ONE OF THE OTHER METALS. THE LAYERED STAINLESS STEEL BODY IS HEATED TO A TEMPERATURE BELOW THE MELTING POINT TEMPERATURE OF THE METAL LAYER HAVING THE LOWEST MELTING POINT SO THAT THE LAYERS, WITH THE EXCEPTION OF THE BARRIER LAYER, DIFFUSE INTO ONE ANOTHER, THEREBY FORMING THE ALLOY LAYER OVERLYING THE BARRIER LAYER WHICH IS RESISTANT TO CORROSIVE ATTACK FROM COMMON ELECTROLYTES AND IS SOLDERABLE. THE STAINLESS STEEL BODY IS RENDERED SOLDERABLE.

Inventors

• 👤 Edwin Russell Koons
• 👤 Ralph G Parker Jr
• 👤 Jeffery P Rupley

Bibliographic Details