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Jermain Onye thesis Final.pdf (2.81 MB)

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Atmospheric Corrosion of Zn by NaCl, SO2, NH3, O3, and UV Light

Onye, Jermain Eze
http://rave.ohiolink.edu/etdc/view?acc_num=osu1408822401

Abstract Details

2014, Master of Science, Ohio State University, Materials Science and Engineering.
Zinc (Zn) coatings on steel structures for corrosion protection are by far the greatest use of Zn throughout the world. Numerous experiments have been conducted in laboratory environments to predict and understand the corrosion behavior of Zn coatings in the field. However, many studies have been limited to time of wetness, pH, and chloride (Cl-) and sulfur dioxide (SO2) concentrations to predict the Zn corrosion rate. The corrosion behavior of Zn exposed to 120 ppb SO2, 550 ppb ammonia (NH3), 650 ppb ozone (O3), and ultraviolet (UV) light at 70% RH, with a constant preloading of sodium chloride (NaCl) was investigated in this study. After exposure, corrosion rates were measured using mass loss and corrosion products were identified by x-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), and energy dispersive spectroscopy (EDS). UV light and O3 did not significantly affect the Zn corrosion rate in the absence of Cl-. However, when NaCl was present, UV light inhibited the Zn corrosion rate below 90% RH and accelerated the Zn corrosion rate at 99% RH. The presence of UV light also increased the formation of zinc hydroxy sulfate and gordaite when exposed to 120 ppb SO2 and NaCl. The combination of SO2 and O3 with the preloading of NaCl increased the corrosion rate of Zn compared to NaCl alone. 550 ppb NH3 was determined not to have a significant effect on the Zn corrosion rate.
Gerald Frankel, Sc.D. (Advisor)
Rudolph Buchheit, Professor (Committee Member)
99 p.
Atmosphere; Chemistry; Materials Science
Corrosion, atmospheric corrosion, zinc, Zn, sulfur dioxide, SO2, ammonia, NH3, UV light, ultra violet light, ozone, O3,

Recommended Citations

Citations

  • Onye, J. E. (2014). Atmospheric Corrosion of Zn by NaCl, SO2, NH3, O3, and UV Light [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408822401

    APA Style (7th edition)

  • Onye, Jermain. Atmospheric Corrosion of Zn by NaCl, SO2, NH3, O3, and UV Light. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1408822401.

    MLA Style (8th edition)

  • Onye, Jermain. "Atmospheric Corrosion of Zn by NaCl, SO2, NH3, O3, and UV Light." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408822401

    Chicago Manual of Style (17th edition)

osu1408822401
3,607
© 2014, some rights reserved.Creative Commons License Atmospheric Corrosion of Zn by NaCl, SO2, NH3, O3, and UV Light by Jermain Eze Onye is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.