Date of Last Revision

2021-09-09 09:10:01

Major

Corrosion Engineering - Cooperative Education

Degree Name

Bachelor of Science

Date of Expected Graduation

Spring 2016

Abstract

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.

Research Sponsor

Robert S Lillard

First Reader

Rajeev K Gupta

Second Reader

Qixin Zhou

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