Title page for ETD etd-07212010-020238

Type of Document Master's Thesis
Author Bradley, Randall S
URN etd-07212010-020238
Title The effect of molecular weight on the behavior of polystyrene coated steel disks under fretting conditions
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Eiss, Norman S. Jr. Committee Chair
Furey, Michael J. Committee Member
Taylor, Larry T. Committee Member
  • Steel
Date of Defense 1988-12-09
Availability restricted
Thin polymeric coatings have been applied to metal surfaces to prevent and/or prolong the onset of fretting corrosion, but the properties that make a polymeric coating effective and the means by which a coating fails are unknown. The purpose of this study was to determine the effect of molecular weight, casting solvent, and amplitude of motion on the life of thin (25 ~m nominal) polystyrene coatings. Narrow molecular weight distribution polystyrene coatings ranging from =19,400 to =1,460,000 were applied to UNS G10450 steel disks with toluene and MEK as casting solvents. The coatings were fretted against UNS G52100 steel balls at 20 Hz under 22.3 N normal load. Amplitudes of motion ranged from 100 ~m to 500 ~m. Coating life and friction force were measured. Coatings of =207,700 showed maximum life at all amplitudes. Friction remained constant for all tests, and increasing amplitude decreased life. Toluene-cast coatings had slightly shorter lives and more coating racks than MEK-cast coatings. Toluene-cast coatings below =53,700 cracked severely during solvent removal and were not tested.
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