一种新型含铜钛合金的制备与抗菌性能研究

Currently, oil well tubing and surface pipelines are facing severe risks of microbial corrosion (MIC). Microorganisms can multiply in fracturing fluids, drilling muds, and formation water, resulting in significant corrosion and clogging of oil well tubing and surface pipelines, and other accidents, which seriously affect oil and gas production and safety. Ti-alloy has the advantages of corrosion resistance and high strength, but its antimicrobial properties require further investigation. This article, a novel Cu-containing Ti-alloy TC18-0.5Cu was made by vacuum arc melting, which then subjected to 800^oC solid solution treatment (ST800), 800^oC SS treatment plus 580^oC aging treatments (ST800AG580), and 800^oC SS treatment plus 620^oC aging treatment, respectively. Futher, the antimicrobial performance of the three alloys was assessed in sulfate-reducing bacteria (SRB) containing artificial formation waters, meanwhile the growth of sulfate-reducing bacteria (SRB) was analyzed by surface morphology and biofilm thickness, and the bactericidal rate of the Ti-alloys was calculated based on the results of the confocal microscope shots. The results showed that the sterilization rate of the three copper-containing Ti-alloys with different heat treatments could reach more than 75%, suggesting that the heat treatment processes had no significant effect on their sterilization effect. The antimicrobial property of the copper-containing Ti-alloy is due to the fact that the Cu in the alloys is dissolved in the corrosive environment, and the Cu ions destroy the bacterial membrane of bacteria such as SRB, thus inhibiting the growth of bacteria. Furthermore, electrochemical tests revealed that the addition of a small amount of copper, combined with a suitable heat treatment process, also improved the corrosion resistance of the alloy.