Toward scalable TiO

Scalable manufacturing of titania nanotube (TiO2 NT) coatings for orthopedic implants requires robust control of electrochemical anodization and post-anodization thermal processing under production-relevant conditions. While TiO2 nanotube surfaces have shown promising biological performance at a laboratory scale, industrial translation is constrained by challenges associated with electrolyte reuse, process reproducibility, and annealing throughput. This study addresses these bottlenecks through a combined experimental and process-modeling approach focused on manufacturability rather than biological validation. Three anodization workflows, an optimized ethylene glycol-based ammonium fluoride process, a conventional EG + NH4F baseline, and an HF aqueous baseline, were benchmarked on additively manufactured Ti–6Al–4V substrates produced by direct metal laser sintering and electron beam melting. The optimized process produced larger nanotube diameters (108 ± 9.6 nm), higher anatase fraction after short annealing (84.9 ± 1.7%), and improved process yield (90.7 ± 2.3%) relative to baseline methods. Electrolyte reuse experiments revealed predictable fluoride depletion and accumulation of dissolved metallic species with increasing processed area; filtration removed particulates but only a limited fraction of dissolved ions. A simple predictive fluoride depletion model was therefore developed to enable proactive replenishment during reuse. Implant-scale furnace modeling showed that direct energy cost per implant is low, while throughput is governed primarily by cycle time. Overall, the study provides a practical framework for electrolyte lifecycle management and high-throughput thermal processing, supporting industrial-scale production of TiO2 nanotube-coated orthopedic implants.