Semester

Fall

Date of Graduation

2022

Document Type

Thesis

Degree Type

MS

College

Statler College of Engineering and Mineral Resources

Department

Mechanical and Aerospace Engineering

Committee Chair

Xingbo Liu

Committee Co-Chair

Shanshan Hu

Committee Member

Shanshan Hu

Committee Member

Wenyuan Li

Abstract

Hot corrosion of materials has remained a relevant topic since its introduction in the second half of the 20th century as gas turbine engines suffered severe corrosion during operation over seawater. Hot corrosion is observed in a multitude of high temperature components, such as gas turbines, power plants, refineries, fluidized bed combustion systems, pipelines, and industrial waste incinerators.

Hot corrosion experiments in the laboratory have been conducted under constant temperatures of interest, while in the actual working conditions of coal-fired power plants, boiler tubes are cooled down via water cooling from a relatively high fireside temperature, e.g., 1000°C. To investigate the degradation regularity of boiler tubes more accurately in a realistic working environment, it is necessary to probe the difference between these two conditions. Herein, electrochemical tests including open circuit potential (OCP), electrochemical noise (EN) and potentiodynamic polarization (PDP) have been adopted to compare the coal ash hot corrosion behavior of T12 steel at constant 400°C and air-cooled (from 1000°C to 400°C) corrosion environments using our proposed hot corrosion electrochemical sensor system. Additionally, corrosion rates have been measured via weight loss experiments and corrosion product morphology was analyzed via X-ray diffraction (XRD) and scanning electron microscopy (SEM) to probe the key factor influencing the corrosion rate of T12 in the working condition to develop corrosion database for the future research.

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