This paper investigates the corrosion and tribocorrosion behavior of titanium surfaces treated with micro-arc oxidation (MAO) and further functionalized with poly(ethylene glycol) (PEG) and an antimicrobial peptide (AMP). PEG was first covalently conjugated onto the MAO surfaces followed by AMP physical adsorption. The MAO layer maintained its porosity and bulk chemical composition (Ca+ P ) after surface functionalization with PEG-AMP. Although no significant differences on the corrosion mechani