TY - JOUR
T1 - Effect of high-temperature acid aging on microstructure and mechanical properties of PEEK
AU - Badeghaish, W.
AU - Wagih, A.
AU - Rastogi, S.
AU - Lubineau, G.
N1 - Publisher Copyright:
© 2024 The Author(s)
PY - 2024/5
Y1 - 2024/5
N2 - Polyether ether ketone (PEEK) has replaced some parts in downhole applications in the oil and gas industry, demonstrating a huge potential to eliminate the corrosion of metallic parts, especially those that are employed in acidic atmospheres and high temperatures, such as liners, impeller, and sealing applications. However, the performance of PEEK in real downhole conditions remains unknown. In this study, we therefore investigated the evolution of the microstructural, chemical, and mechanical properties of PEEK subjected to hydrochloric acid (HCl), which is the main acid used in downhole applications, at high temperatures. PEEK films with thicknesses of 250, 125, and 50 μm, were saturated in HCl at 100 °C. Moreover, the hardness, elastic modulus, yield, and ultimate strength for the samples with a thickness of 50 μm increased owing to the formation of new crystallites and enhanced chain mobility inside the PEEK microstructure. However, the changes in the mechanical response of the thicker samples were insignificant owing to the difficulty of HCl diffusion in their subsurface layers, especially with the increased crystallinity of the surface layer upon exposure to acids.
AB - Polyether ether ketone (PEEK) has replaced some parts in downhole applications in the oil and gas industry, demonstrating a huge potential to eliminate the corrosion of metallic parts, especially those that are employed in acidic atmospheres and high temperatures, such as liners, impeller, and sealing applications. However, the performance of PEEK in real downhole conditions remains unknown. In this study, we therefore investigated the evolution of the microstructural, chemical, and mechanical properties of PEEK subjected to hydrochloric acid (HCl), which is the main acid used in downhole applications, at high temperatures. PEEK films with thicknesses of 250, 125, and 50 μm, were saturated in HCl at 100 °C. Moreover, the hardness, elastic modulus, yield, and ultimate strength for the samples with a thickness of 50 μm increased owing to the formation of new crystallites and enhanced chain mobility inside the PEEK microstructure. However, the changes in the mechanical response of the thicker samples were insignificant owing to the difficulty of HCl diffusion in their subsurface layers, especially with the increased crystallinity of the surface layer upon exposure to acids.
KW - Diffusion kinetics of HCl
KW - High-temperature aging
KW - Mechanical response
KW - PEEK
UR - http://www.scopus.com/inward/record.url?scp=85190955094&partnerID=8YFLogxK
U2 - 10.1016/j.polymertesting.2024.108429
DO - 10.1016/j.polymertesting.2024.108429
M3 - Article
AN - SCOPUS:85190955094
SN - 0142-9418
VL - 134
JO - Polymer Testing
JF - Polymer Testing
M1 - 108429
ER -