Abstract
In this study, the effects of protein adsorption on the electrochemical corrosion behavior of commercially pure niobium in phosphate-buffered saline (PBS) solutions with several concentrations (0–4 g L–1) of bovine serum albumin (BSA) were investigated via both electrochemical measurements and surface characterization. For low concentrations of BSA, the adsorbed protein molecules are insufficient to form a barrier layer, resulting in slight decrease in the cathodic reaction via the inhibition effect. Meanwhile, the anodic reaction is accelerated by the chelation effect between the protein molecule and metal ions. When the added BSA reaches saturation capacity, the adsorbed protein amount is approximately 1.8 μg cm–2, corresponding to approximately 1.2 adsorbed layers, facilitating the formation of a complete barrier layer. The inhibition effect of adsorbed protein molecules becomes more dominant for both cathodic and anodic reactions. The results of this study will help provide a better understanding of the mechanism of protein adsorption on the corrosion behavior of biometallic alloys.
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