The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1976
Filed:
Jul. 31, 1974
Sian Wah Khoo, Etobicoke, CA;
Ranald L Hay, Caledon East, CA;
Canadian Gas Association, Don Mills, CA;
Abstract
This invention is directed to an improved sacrificial anode which consists of a magnesium or magnesium alloy core having a porous magnesium coating thereon. It is also directed to a method of preparing the anode including etching the anode surface, anodizing the anode for about 10 minutes in a solution of an electrolyte at a current density in the range of 10MA/cm.sup.2 to 50MA/cm.sup.2 using direct current at room temperature, subsequently reversing the current for about 5 minutes, allowing the anode to remain in the electrolyte for a period of about 30 seconds in the absence of current, re-anodizing the anode for about 10 minutes, again reversing the current for about 5 minutes and allowing the treated anode to remain in the electrolyte for a period of about 5 minutes in the abosence of current. This results in an improved anode which gives better protection for structures such as water heaters.