Salt bath system and method for treating metals

• US 2,738,294 A
• Filed: 09/13/1951
• Issued: 03/13/1956
• Est. Priority Date: 09/13/1951
• Status: Expired due to Term

• Current Assignee: Harry R. Spence
• Original Assignee: Harry R. Spence
• Inventors: Spence, Harry R.
• Application Number:
  US03/246,371
• Time in Patent Office: 1,643 Days
• US Class Current: 134/42
• CPC Class Codes: C21D 1/46 Salt baths
• CPC Class Codes: C23G 1/28 with molten salts

Claims

1. IN A SALT BATH SYSTEM, A COMPOSITION CONSISTING ESSENTIALLY OF, SODIUM HYDROXIDE FROM ABOUT 70% TO ABOUT 98%, POTASSIUM HYDROXIDE FROM ABOUT 0.5% TO ABOUT 12% AND THE BALANCE SUBSTANTIALLY AN ALKALINE EARTH METAL HALIDE.

7. IN A METHOD FOR METAL TREATMENT BY AN ANHYDROUS SALT BATH SYSTEM, THE STEPS COMPRISING, IMMERSING WORK OF METAL HAVING A SURFACE TO BE CLEANED IN A FUSED COMPOSITION CONSISTING ESSENTIALLY OF SODIUM HYDROXIDE AS THE PREPONDERANT INGREDIENT, POTASSIUM HYDROXIDE AND AN ALKALINE EARTH METAL HALIDE AT A TEMPERATURE BETWEEN ABOUT 650* F. AND ABOUT 1350* F. FOR A SUFFICIENT TIME TO CLEAN SAID SURFACE.