Journal of The Electrochemical Society · 1958 · 51 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceCorrosion ScienceElectrochemistryMetallic MaterialsCathodic ProtectionCorrosion EngineeringCorrosion MechanismsCorrosion Of SteelsElectrochemical CorrosionGalvanic CorrosionAluminum Alloy CorrosionAluminum CorrosionCorrosion Of Aluminum AlloysCorrosion Of Galvanized SteelGalvanic Corrosion KineticsGalvanic CouplingOxide Film FormationPh Effects On Galvanic Corrosion
The effect of pH, dissolved gas composition, and deaeration on the galvanic characteristics of the aluminum ‐steel couple was investigated. High‐purity aluminum cathodically protects steel completely in chloride solutions within the pH range 0.2–14.0. The galvanic currents and weight losses of the aluminum anodes are at a minimum from pH 4.0 to 10.0. Within this pH range the rate of galvanic corrosion is controlled by oxygen depolarization at the steel cathodes. The galvanic current fluctuates because the oxide film on the steel cathode is thickening with time in an erratic manner.