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Title: Post treatment of thermal spray coatings for improving their corrosion resistance at high temperature
Researcher: Chatha, Sukhpal Singh
Guide(s): Singh, Hazoor
Sidhu, B S
Keywords: Mechanical Engineering
thermal spray coatings
high temperature
Hot Corrosion Mechanism
Laser Remelting
Upload Date: 31-Jul-2013
University: Punjabi University
Completed Date: 2012
Abstract: Hot corrosion of metals and alloys has been identified as a serious problem for many high temperature aggressive environment applications. Power station boiler tubes of coal-fired plants are subjected to frequent degradation by erosion-corrosion problems. Attempts to decrease the maintenance costs of these components have increased interest in shielding with protective coatings. The high resistance of nickel-chromium alloys to high-temperature oxidation and corrosion makes them widely used as welded and thermally sprayed coatings in fossil fuel-fired boilers, waste incineration boilers and electric furnaces. Further, for hightemperature applications requiring wear resistance, thermally sprayed (CrxCy-NiCr) coatings are used in light of the excellent corrosion and oxidation resistance of the Ni-Cr alloy and reasonable wear resistance of chromium carbides. Thermal sprayed coatings are currently used to reduce erosion-corrosion on a large number of components in various industries. However, even using state of the art coating systems, it is not possible to achieve defect free thermal spray coatings. The thermal sprayed coatings consist of voids originating from spraying process that are found at the splat boundaries, through which the coatings were mainly attacked in the corrosive environment. This is the main reason for the density of the coatings by thermal treatments and sealants. In the present work NiCr and Cr3C2-NiCr coatings were deposited on ASMESA213- T91 boiler steel by HVOF process. Further these coatings are post treated by various techniques. The HVOF-sprayed NiCr and Cr3C2-NiCr coatings were sealed with commercially available sealant composed of aluminum oxide and aluminum phosphate.
Pagination: xliv, 409p.
Appears in Departments:University College of Engineering

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01_title.pdfAttached File32.65 kBAdobe PDFView/Open
02_certificate.pdf227.5 kBAdobe PDFView/Open
03_declaration.pdf260.34 kBAdobe PDFView/Open
04_acknowledgements.pdf30.05 kBAdobe PDFView/Open
05_preface.pdf24.54 kBAdobe PDFView/Open
06_contents.pdf45.59 kBAdobe PDFView/Open
07_list of figures.pdf85.53 kBAdobe PDFView/Open
08_list of tables.pdf27.79 kBAdobe PDFView/Open
09_list of publications.pdf29.42 kBAdobe PDFView/Open
10_abbreviations.pdf23.12 kBAdobe PDFView/Open
11_chapter 1.pdf48.42 kBAdobe PDFView/Open
12_chapter 2.pdf483.56 kBAdobe PDFView/Open
13_chapter 3.pdf22.97 MBAdobe PDFView/Open
14_chapter 4.pdf22.89 MBAdobe PDFView/Open
15_chapter 5.pdf84.83 MBAdobe PDFView/Open
16_chapter 6.pdf19.49 MBAdobe PDFView/Open
17_chapter 7.pdf170.67 kBAdobe PDFView/Open
18_chapter 8.pdf50.06 kBAdobe PDFView/Open
19_chapter 9.pdf44.19 kBAdobe PDFView/Open
20_references.pdf116.96 kBAdobe PDFView/Open
21_abstract.pdf32.6 kBAdobe PDFView/Open

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