The reduction of surface roughness on additively manufactured components has become a critical factor in engineering applications. This paper reports the electropolishing of additively manufactured Ti-6Al-4V by powder bed selective laser melting (SLM) using a nontoxic electrolyte solution. The results have shown that the salt-based electrolyte can be used to electropolish titanium alloys. The surface waviness of the as-built Ti-6Al-4V alloy was reduced by five times the average roughness of the as-built specimen. The minimum surface roughness obtained was 9.52 μm. The specimens were characterized by scanning electron microscope, Gwyddion software, and electrochemical impedance spectroscopy (EIS) to evaluate the surface morphology, surface profile, and charge transfer resistance. The X-ray photon spectroscopy (XPS) and X-ray diffraction (XRD) spectroscopy were used to characterize the surface chemistry of the specimen. The XPS and XRD showed TiO2 as the significant component on the surface of Ti-6Al-4V, and the atomic percentage on the surface increased after electropolishing. In addition, the EIS data indicated the high charge transfer resistance of the electropolished specimen, which shows the growth formation of the oxide layer.
The synthesis and corrosion inhibition performance of poly(butylene-succinate)-L-proline (PBSLP) prepared by solution polymerization are reported. PBSLP was characterized by FTIR, XRD, and SEM/energy dispersive X-ray (EDX). PBSLP was used to protect mild steel in 1 M hydrochloric acid. An SEM and an atomic force microscope (AFM) were used to characterize the surface morphology of the mild steel coupons. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the inhibition mechanism of PBSLP, and the inhibitor was a mixed-type corrosion inhibitor with a maximum corrosion inhibition efficiency of 93.0%. Adsorption studies revealed the adsorption of PBSLP to be a monolayer process and therefore, obeyed the Langmuir isotherm model.
The structural integrity of additively manufactured parts is vital in adopting the technology in the manufacturing sector. Corrosion is a significant concern in every manufacturing sector. Therefore, this work presents the corrosion behavior and wear properties of additively manufactured Ti-6Al-4V alloy in the simulated seawater. The used specimens were electropolished in the mixed-metal-salt electrolyte and mechanically polished. The solution with a salinity of 35 ppt was prepared and used as a corrosion media. Electrochemical tests showed electropolished specimens had higher corrosion resistance than mechanically polished samples. The corrosion rate of the electropolished specimen was 0.6 × 10− 2 mmpy, while the mechanically polished specimen had 1.04 × 10− 2 mmpy. Moreover, the impedance measurement revealed electropolished specimens to have higher charge transfer resistance and non-conductive oxide on the surface than mechanically polished ones. The dry sliding wear test revealed electropolished specimens to have a relatively low friction coefficient of 0.12 compared to 0.25 of the mechanically polished specimens. The Vickers hardness of the specimens was comparable to 347 ± 3 HV and 345 ± 2 HV, respectively.
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