Electrodeposition method

• US 2,769,774 A
• Filed: 08/05/1952
• Issued: 11/06/1956
• Est. Priority Date: 08/05/1952
• Status: Expired due to Term

• Current Assignee: Alvin F. Prust, Theron A. Loveland Jr
• Original Assignee: Alvin F. Prust, Theron A. Loveland Jr
• Inventors: Loveland, Theron A. Jr., Prust, Alvin F.
• Application Number:
  US03/302,814
• Time in Patent Office: 1,554 Days
• US Class Current: 205/318
• CPC Class Codes: C25D 11/38 Chromatising

Claims

1. THE METHOD OF CONVERING A METAL ARTICLE WITH A CORROSION-RESISTANT COATING WHICH COMPRISES THE STEPS OF CONTACTING THE METAL ARTICLE WITH A LIQUID BODY CONSISTING ESSENTIALLY OF WATER AND BETWEEN ABOUT 10% AND ABOUT 35% CHROMIC ACID AND BETWEEN ABOUT 3% AND BOUT 12% PHOSPHORIC ACID IN THE RATIO RANGE TO EACH OTHER ABOUT TWO PARTS AND ABOUT THREE PARTS OF CHROMIC ACID PER PART OF PHOSPHORIC ACID, CONTACTING A LEAD BODY WITH SAID LIQUID BODY AT A POINT SPACED FROM SAID METAL ARTICLE, ELECTRICALLY CONNECTING SAID LEAD BODY AND SAID ARTICLE IN AN ELECTRIC CIRCUIT AS AN ANODE AND A CATHODE RESPECTIVELY, AND PASSING AN ELECTRIC CURRENT OF DENSITY BETWEEN ABOUT 75 AMPERES AND ABOUT 500 AMPERES PER SQUARE FOOT OF CATHODE SURFACE THROUGH SAID ELECTRIC CIRCUIT AND THROUGH SAID LIQUID BODY AS AN ELECTROLYTE FOR BETWEEN ABOUT ONE AND ABOUT 20 SECONDS.