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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 71 to 80 of 3951 (0.047 seconds)| 71 |
Application of the Fresnel method to the study of grain boundary segregation in Al-alloysOzkaya, Dogan January 1993 (has links)
No description available.
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| 72 |
The passivity and passivation of the guillotined aluminium electrodeLiu, Chuan January 1994 (has links)
No description available.
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| 73 |
The prevention of the tarnishing of silverRoyal, Helen January 1987 (has links)
The valuable properties of silver can be diminished or destroyed because the metal is susceptible to corrosion by certain atmospheric species. Particularly aggressive is H<SUB>2</SUB>S which 'tarnishes' the surface by reacting to form Ag<SUB>2</SUB>S. There have been many attempts in the past to produce a tarnish resistant silver either by surface coating or bulk alloying; none have so far proved to be entirely successful. This thesis describes the production of surface coatings on silver by inert and reactive sputtering for application in the Silversmithing Industry. They should, therefore, be indistinguishable from silver and contain no more than 7.5% (by weight) of alloying addition (to comply with the Sterling Standard). Initially, the tarnish behaviour of uncoated pure and Sterling silver was investigated. Results indicated that the degree of sulphidation is a strong function of alloy content and also of surface preparation. Oxides of tantalum, hafnium, niobium, tin, zirconium, yttrium, titanium and aluminium were produced by reactive sputtering and deposited onto sputtered silver substrates. Films were characterised by X-ray diffraction and tarnished in a controlled atmosphere. The degree of sulphidation was then assessed by Energy Dispersive X-ray Analysis. The protectiveness of the oxide films was related to film stress, thickness and sputter deposition conditions. Using a dual-target sputter system, alloys of silver-tantalum, silver-hafnium, silver-niobium, silver-titanium and silver-aluminium were produced. The tarnish behaviour of the alloys was investigated as a function of alloy composition. X-ray diffraction analysis demonstrated that the deposition technique was capable of producing non-equilibrium structures. For some of the alloys, selective oxidation resulted in a slight improvement in tarnish resistance. In order to establish whether selective oxidation might produce completely protective surfaces, further studies of the oxidation of such materials needs to be undertaken.
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| 74 |
Stress corrosion cracking of precracked BS 1501-161 steel specimens in contaminated liquid ammonia under constant and slow monotonic loadingSarchamy, D. January 1988 (has links)
No description available.
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| 75 |
A study into the factors influencing the development of patina on the surface of architectural leadBlack, Leon January 1998 (has links)
No description available.
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| 76 |
Periodic active-passive corrosion behaviourZhang, Yijun January 1984 (has links)
No description available.
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| 77 |
The electrochemical behaviour of aluminium-based alloysMorris, Howard January 1988 (has links)
No description available.
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| 78 |
Electrochemical behaviour of segregants in relation to stress corrosion cracking of 3.5NiCrMoV steelKearns, M. A. January 1986 (has links)
No description available.
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| 79 |
High carbon stainless steels for petrochemical steam reformersSteiner, J. L.d'E. January 1985 (has links)
No description available.
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| 80 |
The influence of sulphate-reducing bacteria on hydrogen absorption by steel during microbial corrosionParker, C. H. J. January 1990 (has links)
No description available.
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