4.6 Article

Increasing the Hardness and Corrosion Resistance of the Surface of CP-Ti by Plasma Electrolytic Nitrocarburising and Polishing

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MATERIALS
卷 16, 期 3, 页码 -

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MDPI
DOI: 10.3390/ma16031102

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plasma electrolytic treatment; nitricarburising; polishing; PENC; PEP; CP-Ti; surface roughness; microhardness; corrosion resistance

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The study demonstrates the possibility of increasing the hardness to 1420 HV and the corrosion resistance of the CP-Ti surface through a combined plasma electrolytic treatment. The treatment involves anodic plasma electrolytic nitrocarburising in a solution of ammonia, acetone, and ammonium chloride at 900 degrees C, followed by plasma electrolytic polishing. The research focuses on the morphology, surface roughness, phase composition, structure, microhardness, and corrosion characteristics of the modified layer. Results show that an increase in surface roughness negatively affects the corrosion resistance, and plasma electrolytic polishing can effectively remove the outer porous oxide layer for improved corrosion resistance. The best reduction in corrosion current density is achieved after plasma electrolytic polishing in a solution of ammonium fluoride (4%) at 300 V for 3 minutes, with a decrease of 13 times compared to CP-Ti and two orders compared to a plasma electrolytic nitrocarburising sample.
The possibility of increasing the hardness to 1420 HV and the corrosion resistance of the CP-Ti surface using a combined plasma electrolytic treatment consisting in anodic plasma electrolytic nitrocarburising in a solution of ammonia, acetone and ammonium chloride at 900 degrees C and subsequent plasma electrolytic polishing is shown. The morphology, surface roughness, phase composition, structure and microhardness of the modified layer were studied. The corrosion characteristics of the treated surface were studied through potentiodynamic tests and electrochemical impedance spectroscopy. It has been shown that an increase in the surface roughness has a negative effect on the corrosion resistance. The proposed plasma electrolytic polishing makes it possible to remove the outer porous oxide layer, providing increased corrosion resistance. The highest reduction in the corrosion current density, by 13 times compared to CP-Ti and by two orders compared to a plasma electrolytic nitrocarburising sample, is achieved after plasma electrolytic polishing in a solution of ammonium fluoride (4%) at 300 V for 3 min.

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