Abstract
Abstract Impedance and photoelectrochemical studies have been carried out with AISI 316L stainless steel and Ti–6Al–4 V alloy immersed in simulated extracellular fluid with and without lactic acid additions. The latter was used to simulate the metabolic products associated with infection. Maximal space charge thickness was estimated as 0·6 and 1·6 nm for the stainless steel and the Ti alloy, respectively. For the stainless steel, flat band potential (Eft) varied between −0·340 and −0·533 V(SCE) in the absence of lactic acid, and −0·145 and −0·212 V(SCE) in its presence. For the Ti alloy, Efb ranged from −0·625 to −0·l720 and −0·037 to 0·019 V(SCE) for the same solutions, respectively. The forbidden band energy was also measured for the Ti alloy and values of 3·2 and 3·8 eV were obtained for a direct and an indirect transition, respectively. The donor density was also estimated for both materials. In stainless steel it varied between 3·8×1021 and 1·3×1021 atom cm−3, whereas for titanium alloy it was about ...
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