Method for cathodic protection of aluminum material

Details Method for cathodic protection of aluminum material Method for cathodic protection of aluminum material

1983-08-09

1985-04-09

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204148, 204196, 204197, C23F 1300

Patent

active

045100306

ABSTRACT:
An aluminum article is protected against electrochemical corrosive attack by an aqueous medium with which the article is at least partially in contact by the steps of observing the cathodic potential of the article relative to a reference electrode in contact with the medium; when the observed cathodic potential of said article approaches the potential at which pitting corrosion of the same is initiated, electrically connecting said article directly to a source of potential electronegative with respect to the observed potential of the article to repress the cathodic potential of said article to within the alkali corrosion range; and after the cathodic potential is repressed within the alkali corrosion range, disconnecting the article from said electronegative potential source to allow the article to gradually return to its natural cathodic potential in the medium.

REFERENCES:
patent: 3004905 (1961-10-01), Sabins
patent: 3242064 (1966-03-01), Byrne
patent: 3360452 (1967-12-01), McNulty
patent: 3622489 (1971-11-01), Dumitrescu et al.
patent: 3634222 (1972-01-01), Stephens, Jr.
patent: 3841988 (1974-10-01), Gleason
patent: 4381981 (1983-05-01), Maes

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