Date of Graduation
Honors Research Project
Bachelor of Science
Corrosion Engineering - Cooperative Education
Robert S Lillard
Rajeev K Gupta
The purpose of this research project was to evaluate galvanic damage on 1018 Carbon Steel coupled to Monel K-500 at varying rotation speeds on a rotating cylinder electrode in an aerated solution of ASTM artificial seawater. The work in this project is and attempt to study corrosion behavior for a Monel fastener coupled to a Carbon Steel plate. Polarization curves of each material at different rotation speeds were created to predict the corrosion behavior for a galvanic couple of Carbon Steel and Monel. The Potentiodynamic sweeps predict an increase in the corrosion current density for the galvanic couple when then rotation speed was increased from 0 to 1000 rpm attributable to an increased oxygen concentration at the surface and corresponding increase in cathodic reaction rate.
The general hypothesis was that corrosion behavior on the 8-day exposures would be governed by oxygen diffusion limiting effects. However, the 8-day exposures of the Monel-Carbon Steel couple did not show this clearly due to an increase in crevice corrosion at the Monel/steel interface. This discrepancy between the 8-day exposures of Monel-Carbon Steel galvanic couples and the predictions from the polarization curves suggest that oxygen diffusion effects may not be the controlling mechanism of corrosion behavior on the Monel-Carbon steel couple.
Nnyanzi, John K., "Galvanic Corrosion on Monel K-500 and 1018 Carbon Steel Couple" (2016). Honors Research Projects. 356.