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The electrochemical behavior of the third generation Al-Li alloy 2098 was investigated with a fundamental approach, where experimental results were theoretically analysed in terms of the Point Defect Model (PDM).
The electrochemical behavior of the third generation Al-Li alloy 2098 was investigated with a fundamental approach, where experimental results were theoretically analysed in terms of the Point Defect Model (PDM). For this purpose, the AA2098-T851 was tested in NaHCO3 solution under a CO2
Atmosphere to investigate the kinetics of formation and breakdown of the protective passive film. Experiments were performed at potentials where both metal dissolution and the hydrogen evolution reaction (HER) occur.
Key Words: Passivity, Point Defect Model, potential model, Kinetics, quantum mechanical tunneling
Autoclave tests were performed in CO₂, O₂, and H₂O at 8 MPa at 50°C and 245°C, (heat exchanger operating conditions). Results show significant corrosion in a pressure / temperature region where H₂O saturated with CO₂ condenses on the coupons.
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Special enhancements: (1) use the high temperature reference electrode - Ag/AgCl; (2) define the test temperature measurement procedure; (3) check the accuracy of the reference electrode; (4) develop an inexpensive anode isolation method.
This paper discusses the detailed inspection, testing, metallurgical analysis and supporting factors from which the most likely cause of pitting corrosion was revealed in the DSS flowline welds.