Corrosion behavior of aluminum-molybdenum alloys in chloride solutions

Journal Article · Sun Nov 01 04:00:00 EST 1987 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2100271· OSTI ID:7005709

Moshier, W C; Davis, G D; Ahearn, J S; Hough, H F

The electrochemical response of Al alloys containing various concentrations of Mo in solid solution was studied using potentiodynamic polarization. The evolution of the chemical composition of the passive film during exposure to deaerated O.1N KCl was analyzed using x-ray photoelectron spectroscopy. Exposure of Al-Mo alloys to the chloride solution results in an increase in the corrosion potential and a decrease in the cathodic Tafel slope. The breakdown potential is also found to increase with higher concentrations of Mo in the alloy. These results correlate with an increase in the amount of Mo in the oxide film during polarization, even though the concentration of Mo in the passive film is well below that in the alloy. This work suggests that the oxidized Mo in the passive film inhibits the nucleation of pits in the alloy by improving the integrity of the passive film.

• Research Organization: Martin Marietta Labs., Dept. of Materials and Surface Science, Baltimore, MD (US)
• OSTI ID: 7005709
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 134:11; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSION PRODUCTS
CORROSIVE EFFECTS
ELECTROCHEMICAL CORROSION
HALIDES
HALOGEN COMPOUNDS
MOLYBDENUM ALLOYS
NUCLEATION
OXIDATION
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
POTENTIOMETRY
TITRATION