A literature study of the etching process on nickel- and titanium-based superalloys - The chemical reactions at the metal-liquid interface

Visa enkel post
dc.contributor.authorAppelqvist, Henrik
dc.contributor.departmentChalmers tekniska högskola / Institutionen för kemi och kemitekniksv
dc.contributor.departmentChalmers University of Technology / Department of Chemistry and Chemical Engineeringen
dc.contributor.examinerSkoglundh, Magnus
dc.contributor.supervisorSkog Brönnestam, Monica
dc.date.accessioned2024-07-01T06:46:28Z
dc.date.available2024-07-01T06:46:28Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractIn the aerospace industry, the requirement for material properties and product safety are among the most important factors to consider in order to ensure the safety and reliability of the aircrafts. During the manufacturing process, the formation of cracks in the material might occur. For example, polishing of a region in the close vicinity of a crack can smear the metallic material over the cracks. This would result in that the crack could go undetected through quality control. Additionally, the oxides formed during heat treatment were shown to have high chemical stability and would cause trouble during removal. Therefore, in this literature study, the oxidation behavior of nine highly relevant aerospace materials were examined together with the effect of six common etching solutions. Furthermore, the relationship between etch rate with temperature and concentration of each etching solution was also explored. The study found that the pure metals, in most cases, were dissolved by the etching solutions with a few exceptions where passive reaction products were formed on the surface. Passive reaction products restricted diffusion of metallic elements out towards the oxidizing environment and vice versa. These would instead have the opposite effect on the etch rate where it would decrease as the reaction progressed due to the growing thickness of the metal oxides. A similar behavior could be seen by the metal oxides, but the oxidizing etching solutions and the acetic acid, weak acid, could not affect the metal oxides. An increased temperature and concentration of etching solution, did in most cases lead to an increased rate. Exceptions from the trend showed that some acids had an optimal concentration at which the reaction could ensue. The primary variable was the acids ability to dissociate which occurs when water is present. Therefore, the etch rate would decrease at very high concentrations due to the lack of water. Although this literature study can give an insight in the etching process, or more specifically the reactions that occur at the interface between the metallic material and the etching solution, further work is needed to achieve a deeper understanding of the application on a larger scale.
dc.identifier.coursecodeKBTX12
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308144
dc.language.isoeng
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectSuperalloy
dc.subjectEtching
dc.subjectTitanium-based
dc.subjectNickel-based
dc.subjectDissolution
dc.subjectCorrosion
dc.titleA literature study of the etching process on nickel- and titanium-based superalloys - The chemical reactions at the metal-liquid interface
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeMaterials chemistry (MPMCN), MSc
Ladda ner
Original bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
A literature study of the etching process on nickel- and titanium-based superalloys - The chemical reactions at the metal-liquid interface_Henrik_Appelqvist.pdf
Storlek:
1.34 MB
Format:
Adobe Portable Document Format
Beskrivning:
Ladda ner
License bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
license.txt
Storlek:
2.35 KB
Format:
Item-specific license agreed upon to submission
Beskrivning:
Ladda ner
Samling
Examensarbeten för masterexamen