Sacrificial anode

Details Sacrificial anode Sacrificial anode

1974-07-31

1976-05-11

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204 56M, 204148, 204290R, C23F 1300, C25D 1130

Patent

active

039560953

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.

REFERENCES:
patent: 1923502 (1933-08-01), Prier
patent: 2880148 (1959-03-01), Evangelides
patent: 2926125 (1960-02-01), Currah et al.
patent: 3732152 (1973-05-01), Hawke
patent: 3739456 (1973-06-01), Scherer et al.
patent: 3887449 (1975-06-01), Baer

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