Vol.:(0123456789) 1 3 Journal of Bio- and Tribo-Corrosion (2021) 7:2 https://doi.org/10.1007/s40735-020-00435-x Chemical, Electrochemical, and Surface Study on Microbial Attack of CoCrMo Dental Alloy by Streptococcus mutans K. Moufih 1  · A. Marda 2  · M. Boudalia 1  · A. Bellaouchou 1  · M. Tabyaoui 1  · A. Guenbour 1  · L. Bahij 3  · F. Zauoi 3  · I. Warad 4  · A. Zarrouk 1 Received: 10 July 2020 / Revised: 30 September 2020 / Accepted: 14 October 2020 © Springer Nature Switzerland AG 2020 Abstract In this investigation, the objective of our research was to evaluate the infuence of the corrosion behavior of CoCrMo dental alloy in the presence of the oral bacteria Streptococcus mutans (Streptococcus mutans) and its growth byproducts. The cor- rosion resistance of the dental alloy CoCrMo followed a comparative study in the sterilized Fusayama’s artifcial saliva (FAS) containing Trypticase soy broth (TSB) (medium 1) and Streptococcus mutans mixed with (TSB) and (FAS) (medium 2). To perform this study, electrochemical corrosion tests including open circuit potential (OCP), potentiodynamic polarization (PDP), and impedance spectroscopy (EIS) measurements and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used. The formed flms biomass was observed by an optical microscope, after 216 h (9 days) of exposition to medium containing Streptococcus mutans; then, it was verifed by SEM–EDS analysis. The results of the electrochemi- cal corrosion showed a signifcant shift of the corrosion potential and an increase in the corrosion current density (i corr ) and the corrosion resistance (R p ) after 24 h of immersion of the alloys in the medium containing Streptococcus mutans. This led to alter the formation of the passive flm which reveals the high reactivity of CoCrMo in the presence of Streptococcus mutans, whereas the surface analysis confrmed the bioflm formation once the contact of Streptococcus mutans to CoCrMo alloy surfaces was insured. Graphic Abstract Extended author information available on the last page of the article