Investigation of new materials and methods to reduce corrosion of stainless steel in contact with molten chloride salts.Reportar como inadecuado




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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. 2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis

Abstract [en] : In this study, the corrosion resistance of three different stainless steels (304, 316 and 309) towards eutectic chloride salts is investigated. The performances of two materials to reduce the corrosion of the steels are examined: zirconium as sacrificial anode and an Al2O3 coating deposited by flame spraying. Samples are submitted to a 24 hours corrosion test at 700°C in air. The samples are characterised by weight analysis, SEM observations and EDX analysis of their surface and cross-section. The corrosion resistance of the stainless steels is not improved by adding Zr rods in direct contact with the steel, rather decreased in the areas where the rod laid. However, in these conditions, stainless steel 316 has the best resistance to highly corrosive chloride salts. The Al2O3 coating is too porous and penetrated by the salt, the steel underneath is corroded. Nevertheless, some alumina remains intact after the corrosion test, because of the high inertness of the ceramic. The presence of O2 most certainly accelerated the corrosion mechanism studied here.

Place, publisher, year, edition, pages: 2017. , 52 p.

Keyword [en] : Corrosion, chloride salts, stainless steel, zirconium

National Category : Corrosion Engineering

Identifiers: URN: urn:nbn:se:ltu:diva-63804OAI: oai:DiVA.org:ltu-63804DiVA: diva2:1106934

External cooperation : Cleanergy AB

Subject / course: Student thesis, at least 30 credits

Educational program: Materials Engineering, master's level

Presentation : 2017-05-24, E281, Luleå, 09:00 (English)

Supervisors : Rilby, ErikCleanergy AB.

Examiners : Vuorinen, Esa, biträdande professorLuleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Available from: 2017-07-05 Created: 2017-06-08 Last updated: 2017-07-05Bibliographically approved



Autor: Linder, Clara

Fuente: http://ltu.diva-portal.org/







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