Canadian Gas Association

Ranald L Hay

Sian Wah Khoo

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.

Growing community of inventors

Caledon East, Canada

Ranald L Hay