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Nisheeth Kr. Prasad,A. S. Pathak,S. Kundu,K. Mondal 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
The effect of deaeration, Cl−ion content and strong oxidizer on the active behavior of the high phosphorus pig iron (HPPI)samples was studied in 3.5% NaCl and 1 N HNO3solutions. Deaerating the 3.5% NaCl solution could effectively shift thecorrosion potential of the HPPI below the protective potential of the steel in seawater [− 0.778 V vs saturated calomelelectrode (SCE)], which has not been observed in the freely aerated 3.5% NaCl solution. Both the Cl−ion content and thedeaerated conditions restrict the formation of the stable iron phosphate on the surface and promote the dissolution of the pigiron as soluble iron phosphate hydrate (FePO4·2H2O). However, in the case of the freely aerated nitric acid solution, evenwith deaeration, the HPPI samples have shown more noble behavior as compared to the mild steel due to the strong oxidizingnature of nitric acid and the formation of a stable iron phosphate on the surface.
Tarun Bhardwaj,Mukul Shukla,Nisheeth K. Prasad,C. P. Paul,K. S. Bindra 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
In this study, the direct laser deposition-additive manufacturing (DLD-AM) process is employed to fabricate Ti–15Mobiomedical alloy along two build directions. The aim is to analyse the effect of induced surface topography on corrosionand in-vitro bioactivity, motivated towards ultimate reduction in post-fabrication surface modifications. The effectof surface roughness on corrosion resistance is analysed in-vitro in simulated body fluid (SBF) by electrochemical study. Owing to higher surface roughness in the vertical build samples (Ra = 52.70 ± 11.40 μm) than the horizontal build samples(Ra = 27.10 ± 4.17 μm), upto 75% higher corrosion resistance is found for horizontally built samples. The double passivebarrier layer formed in horizontal build higher surface finish samples results in lower corrosion. Further, wettability testconfirms that both the build orientations exhibit a hydrophilic surface nature, leading to improved cell attachment. SEM–EDSanalysis establishes the in-vitro apatite formation on immersion in SBF, for both build orientation samples. This study leadsto understand the role of build orientation induced surface topography for production of minimal post-surface treatmentTi–15Mo bio-implants by the DLD-AM process.