Exploiting the effect of PEO parameters on the surface of AISI 1020 low-carbon steel treated in a TaOH-rich electrolyte

• Published in: Surface & coatings technology 2024-02, Vol.477, p.130374, Article 130374
• Main Authors: Marcuz, N., Ribeiro, R.P., Rangel, E.C., Cruz, N.C., Possato, L.G., Coan, K.S., Grandini, C.R., Correa, D.R.N.
• Format: Article
• Language: English
• Subjects: Corrosion; Low-carbon steel; Medical device; PEO; Ta oxide; Wear
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2024.130374

This study used PEO treatment and a TaOH-rich electrolyte to coat AISI 1020 low-carbon steel to enhance its anti-corrosion and wear properties, targeting its usage as a medical device. The effect of time, duty cycle, frequency, and Ta(OH)5 concentration on the chemical and phase composition, topography, wettability, and roughness of the obtained coatings were addressed. The results indicated that the Fe-based oxide coatings had a rough and super-hydrophilic surface. The phase composition of the coatings was formed mainly of Ta2O5, hematite (Fe2O3), and a minor amount of rust (Fe(OH)2), with the chemical analyses also indicating the presence of some absorbed molecules. Once the best PEO parameters were established (200 V, 5 min, 60 %, 1000 Hz, and 40 g/L Ta(OH)5), the previous mechanical, corrosion, and wear tests evidenced the positive effect of the chemical species deposited in the surface when compared to the substrate. In this way, PEO treatment applied on AISI 1020 low-carbon steel in a TaOH-rich electrolyte can be an adequate alternative to produce low-cost materials for medical devices, especially as a potential substitute for stainless steel and titanium-based alloys in surgical instruments. [Display omitted] •PEO parameters affected the surface characteristics of low-carbon steel differently.•PEO treatment induced the formation of Fe2O3 and diminished Fe(OH)2 on the surface.•Fe2O3 and Ta2O5 protected the surface against corrosion in saline solution.•PEO-treated sample had superior wear resistance due to adhesive mechanisms.•PEO-treated low carbon steel can be a proper alternative for use as medical devices.