LABORATORY INVESTIGATION OF THE EFFECTS OF CATHODIC PROTECTION ON THE CORROSION OF THE GALVANIZED COATING ON GALVANIZED STEEL
Abstract
An investigation was made to determine the possible benefit of cathodic protection to the service life of galvanized iron or steel. Sacrificial magnesium anodes were used producing structure-to-electrolyte potentials of -1.04 to -1.20 volts with an average value of -1.05 volts with reference to a copper-copper sulfate half cell. Controlled laboratory tests showed that: (1) cathodic protection reduces general corrosion of the galvanized coating significantly; (2) cathodic protection does not eliminate corrosion of the galvanized coating entirely, as local pitting corrosion occurs to some extent; and (3) the equilibrium concentration of alkali at the cathode is too low to promote alkali corrosion of the cathodically protected coating.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1963
- Accession Number
- AD0428513
Entities
People
- T. E. Backstrom
Organizations
- United States Bureau of Reclamation