Date of Graduation

Spring 2016

Document Type

Honors Research Project

Degree Name

Bachelor of Science

Major

Corrosion Engineering - Cooperative Education

Research Sponsor

Robert S Lillard

First Reader

Rajeev K Gupta

Second Reader

Qixin Zhou

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.

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