Surface studies of potentially corrosion resistant thin film coatings on chromium and type 316L stainless steel

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Show simple item record Johnson, Stephanie Lee 2006-12-01T16:19:18Z 2006-12-01T16:19:18Z 2006-12-01T16:19:18Z
dc.description.abstract This work is a detailed study of the interaction between two phosphorous-containing acids and the metals chromium and 316L stainless steel. The objective of this work is to investigate the formation of unique thin films on the two metals and to probe the surface chemistry of these films through the use of core level and valence band X-ray photoelectron spectroscopy (XPS). Chromium forms a wide array of oxides and can exist at several valencies. Valence band XPS is used in conjunction with band structure and multiple scattered wave X[alpha] calculations to distinguish which states are present in the resultant films. Both 99.99% chromium and 316L stainless steel foils were treated with orthophosphoric acid and 1-hydroxyethylidene-1,1-diphosphonic acid, otherwise known as etidronic acid. Two methods developed in the Sherwood research laboratory for forming oxide-free films on metal surfaces are utilized in this work. Core level XPS results did not provide sufficient information to draw conclusions regarding the products formed in the reactions. The valence band results showed clear evidence of multiple forms of phosphates forming on the metal surfaces as evidenced by the subtle differences in separation between the phosphorous 3p and 3s peaks as well as differences in separation between the O2s and phosphorous 3s peaks. The Valence Band XPS results were interpreted by X-[alpha] cluster and band structure calculations. Films formed on chromium foil from the orthophosphoric acid were found to be condensed phosphates that are stable in air. Etidronic acid formed very thin phosphate films on chromium with both treatment methods as well as on 316L stainless steel when the bench top method was applied. Treatment of etched 316L steel in the anaerobic cell generated an etidronate film. This sample was the only etidronate film formed, all other etidronate-based films were generated from disassembled portions of the etidronate ion to form phosphate films. en
dc.description.sponsorship National Science Foundation en
dc.format.extent 6317366 bytes
dc.format.mimetype application/PDF
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject Materials chemistry en
dc.subject Surface science en
dc.subject Chromium phosphates en
dc.subject X-ray photoelectron spectroscopy en
dc.title Surface studies of potentially corrosion resistant thin film coatings on chromium and type 316L stainless steel en
dc.type Dissertation en Doctor of Philosophy en
dc.description.level Doctoral en
dc.description.department Department of Chemistry en
dc.description.advisor Peter M. Sherwood en
dc.subject.umi Chemistry, Analytical (0486) en
dc.subject.umi Chemistry, Physical (0494) en 2006 en December en

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