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oai:docta.ucm.es:20.500.14352/1180742025-03-18T13:00:13Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Daavari, Morteza author Conde, Ana author Atapour, Masoud author HosseinpourRokni, Mohsen author Mora Sánchez, Hugo author Mohedano Sánchez, Marta author Matykina, Endzhe author Arrabal Durán, Raúl author 2023-09-25 The effects of multi-walled carbon nanotubes (MWCNTs) incorporation and polycaprolactone (PCL) post-treatment on the environmental-assisted cracking behaviour of a plasma electrolytic oxidation (PEO) coated AZ31B Mg alloy were elucidated in this study. Slow strain rate tensile (SSRT) experiments were carried out in simulated body fluid (SBF) for the bare material and different coating systems with and without MWCNTs and PCL overlay. Electrochemical impedance spectroscopy (EIS) and microscopic examinations (SEM and optical) were also conducted to reveal the role of corrosion on the mechanical response. In spite of the significant positive influence of the PEO coatings (with and without MWCNTs) on the bio-electrochemical behaviour of the AZ31B alloy, the environmental-assisted cracking performance was only marginally improved. Furthermore, PEO+MWCNTs/PCL coating system increased the fracture strain of the specimens by 7% compared to the un coated specimens. Based on the SEM and optical micrographs, hydrogen embrittlement was suggested as the main cause of failure of the coated specimens under the in vitro slow strain rate test conditions. Morteza Daavari, Ana Conde, Masoud Atapour, Mohsen HosseinpourRokni, Hugo Mora Sánchez, Marta Mohedano, Endzhe Matykina, Raul Arrabal, In vitro corrosion-assisted cracking of AZ31B Mg alloy with a hybrid PEO+MWCNTs/PCL coating, Surfaces and Interfaces, Volume 42, Part B, 2023, 103446, ISSN 2468-0230, https://doi.org/10.1016/j.surfin.2023.103446. 10.1016/j.surfin.2023.103446 https://hdl.handle.net/20.500.14352/118074 https://doi.org/10.1016/j.surfin.2023.103446 https://www.sciencedirect.com/science/article/pii/S2468023023008167 In vitro Corrosion-Assisted Cracking of AZ31B Mg Alloy with a Hybrid PEO-MWCNTs/PCL Coating