This work studied the determination of the hydrogen fugacity during electrolytic charging. With a virgin surface, there were irregular permeation transients, attributed to irreproducible surface conditions. Cathodic pre-charging conditioned the entry side to a stable state. Permeability transients were used to measure the critical parameters in the thermodynamic relationship between hydrogen activity and electrochemical potential. At the same overpotenial, the hydrogen fugacity in the pH 12.6 0.1 M NaOH solution was higher than that in the pH 2 0.1M Na 2 SO 4 solution, attributed to differences in (i) the hydrogen evolution reaction, (ii) the surface state, and (iii) the true surface area.

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Antibacterial Fe-xCu biomedical alloys are designed to have a satisfactory biodegradation rate compared with pure iron. Fe-xCu (x ¼ 0, 1.5, 2.3, 7.8, and 10.1 wt%) alloys are produced by selective laser melting (SLM). Alloying with Cu has a significant influence on the grain size, hardness, biodegradation rate, and antibacterial performance of SLMed Fe-xCu alloys. Increasing Cu content decreases the grain size and increases the hardness. SLMed Fe-1.5Cu, Fe-2.3Cu, and Fe-10.1Cu have degradation rates similar to that of pure iron, while the degradation rate of SLMed Fe-7.8Cu is almost 2.5 times faster. The SLMed Fe-2.3Cu, Fe-7.8Cu, and Fe-10.1Cu produce strong antibacterial performance. The mechanisms of degradation behavior and antibacterial performance are clarified. SLMed Fe-7.8Cu had appropriate mechanical properties, satisfactory degradation rates, strong antibacterial performance, and good cytocompatibility, and therefore is a novel type of antibacterial biomedical alloy with good potential for clinical application.

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