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MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE FILMS

PAN, GUIRONG
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690

Abstract Details

2006, PhD, University of Cincinnati, Engineering : Materials Science.
Although it is known that certain organosilanes can dramatically improve the corrosion resistance when deposited on metals, the origin of this effect and its dependence on film characteristics are not fully understood. In this work, the morphology and structure of the silane films, as well as their response to water exposure, are studied mainly by neutron reflectivity. Hydrothermal conditioning and solvent swelling are used to challenge the films. The silanes studied include bis-[triethoxysilylpropyl]tetrasulfide (bis-sulfur) and bis-[trimethoxysilylpropyl]amine (bis-amino) as well as mixed silane films. Initial studies were done on films spin-coated on silicon wafer substrates from 1% solutions and cured at 80 °C. Here the focus is the effect of the bridging group on the morphology and water-barrier properties of the films. Subsequent work addresses the same systems deposited on aluminum substrates, films cured at 180 °C and films of larger thickness. The goal is to clarify the relationship between silane molecular structure, processing variables, morphology and water-barrier properties of films while developing a database for optimizing the performance in anti-corrosion applications. Bridging group is the key factor that controls the morphology and water-barrier properties of silane films. Bis-sulfur silane is not as condensed as bis-amino silane, but it swells less in water because of the hydrophobic nature of bridging group. By contrast, bis-amino film is more hydrophilic since the secondary amine group hydrogen bonds with water. The bulk mixed silane film swells with water to an extent that is slightly less than that of both components weighted by their volume fraction. But, based on the enhanced shrinkage that occurs upon water conditioning of the mixed film, condensation is accelerated in the mixed silane film. Bis-amino silane, may act as a catalyst in the hydrolysis of bis-sulfur silane leading to more silanols groups in the solution, which in turn will improve the wettability of the solution. This effect might explain the superior performance of the mixed film compared to pure bis-sulfur silane film. Processing variables also impact the water-barrier performance. For bis-sulfur silane films, both larger thickness and higher cure temperature are critical for effective water-barrier properties.
Dr. Dale Schaefer (Advisor)
189 p.
Engineering, Materials Science
Silane film; neutron reflectivity; swelling; interface; processing variable; water barrier; anti-corrosion; water absorption

Recommended Citations

Citations

  • PAN, G. (2006). MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE FILMS [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690

    APA Style (7th edition)

  • PAN, GUIRONG. MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE FILMS. 2006. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690.

    MLA Style (8th edition)

  • PAN, GUIRONG. "MORPHOLOGY AND PROPERTIES OF ANTI-CORROSION ORGANOSILANE FILMS." Doctoral dissertation, University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152291690

    Chicago Manual of Style (17th edition)

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© 2006, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.