Surface morphology and corrosion properties of 2205 DSS substrate modified by a deposited coating layer of hydroxyapatite/multiwall carbon nanotubes composite

Instead of employing duplex stainless steel (DSS) alone, the current effort aims to coat the 2205 DSS with hydroxyapatite (HA) coupled with carbon nanotube (CNTs) for biomedical applications to improve corrosion performance and biocompatibility. The surface of 2205 DSS has been coated with hydroxyapatite/Multiwall carbon nanotube composite particles by using the electrophoretic deposition (EPD) process to enhance corrosion resistance, biocompatibility, and osseointegration. In order to identify the ideal values for EPD factors, the current study examines the impact of the two most significant EPD variables (potential and time) on the characteristics of the deposited layer. The scanning electron microscope (SEM) is used to determine the coating properties. Potentiodynamic and cyclic polarization tests are used in Ringer's solution to evaluate the corrosion test of coated and uncoated specimens. According to the results, the ideal suspension has 65 wt.% HA and 35 wt.% multiwall carbonnanotube (MWCNT), is coated at 50 V for 2 min, and has a homogeneous morphology, a thick structure, and no cracks. Additionally, this sample had the least amount of porosity (0.572%) and the maximum rate of corrosion (0.091 mpy), making it well suited to serve as a barrier against the localized corrosion attack caused by the numerous aggressive ions that occurred in Ringer's solution during the corrosion test.