Imperial College London

ProfessorMaryRyan

Faculty of EngineeringDepartment of Materials

Vice-Dean (Research), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6755m.p.ryan

 
 
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Location

 

B338Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

219 results found

Davenport AJ, Ryan MP, Simmonds MC, Ernst P, Newman RC, Sutton SR, Colligon JSet al., 2001, In situ synchrotron X-ray microprobe studies of passivation thresholds in Fe-Cr alloys, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 148, Pages: B217-B221, ISSN: 0013-4651

Journal article

Ryan MP, Toney MF, Oblonsky LJ, Davenport AJet al., 2001, An X-ray diffraction study of the passive oxide film on iron, The solid-liquid interface, theory and experiment, Editors: Woods Halley, Publisher: Oxford University Press, ISBN: 9780841237179

Book chapter

Isaacs HS, Jeffcoate CS, Aldykiewicz AJ, Ryan MP, Kaneko M, Shea-Mccarthy Get al., 2000, Scanning volta potentials and polarization measurements of metals in irradiated air, ELECTROCHEMICAL AND SOLID STATE LETTERS, Vol: 3, Pages: 253-255, ISSN: 1099-0062

Journal article

Davenport AJ, Oblonsky LJ, Ryan MP, Toney MFet al., 2000, The structure of the passive film that forms on iron in aqueous environments, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 147, Pages: 2162-2173, ISSN: 0013-4651

Journal article

Oblonsky LJ, Ryan MP, Isaacs HS, 2000, In situ XANES study of the formation and reduction of the passive film formed on Fe in acetate solution, CORROSION SCIENCE, Vol: 42, Pages: 229-241, ISSN: 0010-938X

Journal article

Jeffcoate CS, Isaacs HS, Aldykiewicz AJ, Ryan MPet al., 2000, Chromate in conversion coatings: A XANES study of its concentration and mobility, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 147, Pages: 540-547, ISSN: 0013-4651

Journal article

Laycock NJ, Linton VM, Wilson PT, Ryan MP, Crouch DSet al., 2000, Stainless steels and nickel-base alloy weldments in highly oxidising conditions, Melbourne, Australia, 29 October-2 November 2000, Publisher: WTIA

Conference paper

Wilson PT, Laycock NJ, Ryan MP, Crouch DS, Issacs HSet al., 2000, Transpassive corrosion of stainless steels and nickel-base alloys, New Zealand, November 19-22 2000, Publisher: ACA

Conference paper

Ryan MP, 1999, In situ X-ray diffraction studies of passive oxide films., ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 218, Pages: U409-U409, ISSN: 0065-7727

Journal article

Isaacs HS, Zhu Y, Sabatini RL, Ryan MPet al., 1999, Transmission electron microscopy of undermined passive films on stainless steel, Critical Factors in Localized Corrosion III - A Symposium in Honor of Jerome Kurgers 70th Birthday, Publisher: ELECTROCHEMICAL SOCIETY INC, Pages: 376-382

Conference paper

Ryan MP, Toney MF, Davenport AJ, Oblonsky LJet al., 1999, In situ X-ray-diffraction studies of passive oxide films, MRS Bulletin, Vol: 24, Pages: 29-35, ISSN: 0883-7694

Recent X-ray scattering studies of the passive film formed on Fe(001) and Fe(110) primarily in borate buffer over a range of potentials are reviewed. The detailed atomic structure of the passive film grown on an iron single-crystal surface at high potential is investigated both in situ during formation and subsequently in air to determine its stability. The technologically relevant effects of the addition of chromium to the alloy and of cathodic polarization in an alkaline environment, as may occur during atmospheric corrosion or in corrosion of steel reinforcing bars in concrete are discussed.

Journal article

Schmuki P, Buchler M, Virtanen S, Isaacs HS, Ryan MP, Bohni Het al., 1999, Passivity of iron in alkaline solutions studied by in-situ XANES and a laser reflection technique, Journal of the Electrochemical Society, Vol: 146, Pages: 2097-2102

Journal article

Ryan MP, Laycock NJ, Issacs HS, Newman RCet al., 1999, Corrosion pits in thin films of stainless steel, Journal of the Electrochemical Society, Vol: 146, Pages: 91-97

Journal article

Ryan MP, Davenport AJ, Toney MF, Oblonsky LJet al., 1999, X-ray scattering studies of the passive oxide films formed on iron and iron chromium alloys, MRS Bulletin, Vol: 24, Pages: 29-35

Journal article

Ryan MP, Yu SY, Brodrick CW, Scully JRet al., 1999, Effects of Nb and Zr alloying additions on the reactivation behaviour of Ti in hydrochloric acid, Journal of the Electrochemical Society, Vol: 146, Pages: 4429-4438

Journal article

Oblonsky LJ, Davenport AJ, Ryan MP, Toney MFet al., 1999, In-situ XRD study of the passive film that forms on iron in borate buffer over a range of potentials, Jasper, 1999

Conference paper

Ryan MP, Laycock NJ, Newman RC, Isaacs HSet al., 1998, The pitting behavior of iron-chromium thin film alloys in hydrochloric acid, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 145, Pages: 1566-1571, ISSN: 0013-4651

Journal article

Schmuki P, Virtanen S, Isaacs HS, Ryan MP, Davenport AJ, Böhni H, Stenberg Tet al., 1998, Electrochemical behavior of Cr<inf>2</inf>O<inf>3</inf>/Fe<inf>2</inf>O<inf>3</inf>artificial passive films studied by in situ XANES, Journal of the Electrochemical Society, Vol: 145, Pages: 791-801, ISSN: 0013-4651

The electrochemical behavior of thin sputter-deposited mixed Cr2O3/Fe2O3oxide films with Cr2O3-contents of 10, 20, 50 and 90% was studied with in situ X-ray absorption near edge spectroscopy (XANES). These measurements gave information on the chemical states and dissolution rates during anodic and cathodic polarization in different electrolytes. At low Cr oxide concentrations, the films dissolve when cathodically polarized and are resistant to dissolution when polarized in the anodic direction. At high Cr2O3concentrations, dissolution occurs when the films are anodically polarized, but the films are stable against cathodic dissolution. In the intermediate Cr oxide concentration range, the oxides neither dissolve under anodic nor cathodic polarization. However, in all the cases, even when no dissolution takes place, the species show electroactivity in that the redox reactions Fe3+→ Fe2+and Cr3+→ Cr6+can take place under cathodic and anodic polarization, respectively. In the mixed oxides a solid-state conversion takes place in the iron oxide phase during reduction, whereas the oxidation of the chromium oxide phase converts only the outermost layer. An acidic environment accelerates both anodic and cathodic dissolution, associated with chemical dissolution of the iron oxide. The results further show that critical threshold values exist for the dissolution resistance of the oxide. These values are different for anodic and cathodic reactions and further strongly depend on the solution chemistry.

Journal article

Toney MF, Ryan MP, Oblonsky LJ, Davenport AJet al., 1998, X-ray scattering studies of the passive oxide film formed on iron, Synchrotron Radiation News, Vol: 11

Journal article

Schmuki P, Virtanen S, Isaacs HS, Ryan MP, Davenport AJ, Stenberg T, Bohni Het al., 1998, Electrochemical behaviour of Cr2O3/Fe2O3 artificial passive films studied by in situ XANES, Journal of the Electrochemical Society, Vol: 145, Pages: 791-801

Journal article

Issacs HS, Zhu Y, Sabatini RL, Ryan MPet al., 1998, TEM investigation of undermined passive films on stainless steel, Boston, USA 1998

Conference paper

Ryan MP, Oblonsky LJ, Isaacs HS, 1998, In situ determination of the composition of surface films formed on Fe-Cr alloys, Journal of Electrochemical Society, Vol: 145, Pages: 1922-1932

Journal article

Ryan MP, Laycock NJ, Newman RC, Issacs HSet al., 1998, The pitting behaviour of thin film FeCr alloys in hydrochloric acid, Journal of the Electrochemical Society, Vol: 145, Pages: 1566-1571

Journal article

Oblonsky LJ, Davenport AJ, Ryan MP, Isaacs HS, Newman RCet al., 1997, In situ x-ray absorption near edge structure study of the potential dependence of the formation of the passive film on iron in borate buffer, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 144, Pages: 2398-2404, ISSN: 0013-4651

Journal article

Issacs HS, Kalinousky DN, Virtanen S, Ryan MPet al., 1997, Electrodissolution of electrodeposited oxides, Materials Science Forum, Vol: 247, Pages: 19-24

Journal article

Ryan MP, Toney MF, Davenport J, Oblonsky LJ, al, etet al., 1997, Atomic structure of the passive oxide film formed on iron, Physical Review Letters, Vol: 79, Pages: 4282-4285

Journal article

Virtanen S, Schmuki P, Issacs HS, Ryan MP, Oblonsky LJ, Vippola M, Bohni Het al., 1997, Influence of solution chemistry on dissolution of artificial passive films, Paris

Conference paper

Oblonsky LJ, Davenport AJ, Ryan MP, Newman RC, Issacs HSet al., 1997, In-situ XANES study of the potential dependence of formation of the passive film on iron in borate buffer, Journal of the Electrochemical Society, Vol: 144, Pages: 2398-2404

Journal article

Schmuki P, Virtanen S, Issacs HS, Ryan MP, Oblonsky LJ, Bohni Het al., 1997, In situ XANES study of the cathodic reduction behaviour of the passive film on iron and artificial passive films, Paris

Conference paper

Schmuki P, Virtanen S, Issacs HS, Ryan MP, Oblonsky LJ, Bohni Het al., 1997, In-situ XANES study of the cathodic reduction behaviour of the passive films on iron and artificial passive films, Paris, France, 1997

Conference paper

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