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An atmospheric cell measures corrosion kinetics. The limiting oxygen reduction current density is increased over immersion results. A segmented, galvanic sensor that enables quantification of spatial distributions of galvanic current is presented.
Atmospheric corrosion represents an annual multi-billion dollar cost burden for the aerospace and defense sectors. For many aircraft, particularly those operating in marine environments, up to ninety percent of corrosion is due to galvanic interactions at dissimilar metal couples. As new materials are introduced with the acquisition of more advanced aircraft, galvanic corrosion is likely to remain a concern. The ability to model galvanic corrosion accurately holds the promise of being able to both predict the performance of new material combinations to guide material selection and predict corrosion damage for maintenance planning. Such models often utilize data collected under immersion test conditions that are not representative of the thin-film electrolytes that are relevant to atmospheric corrosion and may diminish model accuracy and utility. In this work, an atmospheric cell is presented that allows for measurements of corrosion kinetics using thin-film electrolytes. It is observed that the limiting oxygen reduction current density on various alloys is increased several orders of magnitude over immersion results. A segmented, galvanic sensor is presented that enables the experimental quantification of spatial distributions of galvanic current under thin film conditions that is compared to model predictions for verification of the suitability of immersion and thin-film electrolyte polarization data inputs.
Key words: Atmospheric corrosion, thin-film electrolyte, galvanic corrosion, polarization, multi-electrode sensor
Arguments to use long-time cathodic corrosion protection with thermally sprayed zinc and zinc based alloys in… based on laboratory tests, results of field tests as well as the monitoring of metalized steel structures in different countries.
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Thermally sprayed CRA coatings can provide a cost-effective corrosion mitigation method for infrastructure in wet supercritical CO2 at 40°C and 80°C. The scales formed on the steel protected it from further corrosion in 10 MPa and 50 MPa CO2.
How corrosion of steel during the initial stages of coating deterioration can be substantial—in fact corrosion rates can exceed that of boldly exposed steel. Coating selection, design assumptions and maintenance intervals are discussed.