Faculty Publications

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Subject: search.filters.subject.Open circuit potential

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    Tribo-corrosion study of nickel-free, high nitrogen and high manganese austenitic stainless steel
    (Elsevier Ltd, 2018) Vats, V.; Baskaran, T.; Arya, S.B.
    The electrochemical corrosion and tribo-corrosion behaviors of nickel-free high nitrogen (HN SS) and high manganese containing austenitic stainless steel were studied in simulated body fluids such as Ringer's and artificial saliva solutions (ASS) using tribo-meter attached with the potentiostat. Type 316L SS used as reference alloy for comparison. Open circuit potential (OCP) and potentiodynamic polarization techniques were used to examine the passivation and corrosion behavior of both the stainless steels under the applied loads of 5 and 10 N at room temperature and also compared with the static condition of corrosion. Pitting resistance of HN SS was found to be significantly higher over type 316L SS. © 2017 Elsevier Ltd
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    Electrochemical corrosion behavior of Ti-10V-2Fe-3Al in different corrosive media
    (Wiley-VCH Verlag info@wiley-vch.de, 2018) Arya, S.B.; Bhattacharjee, A.; Roy, M.
    The electrochemical corrosion behavior of Ti-10V-2Fe-3Al in different corrosive media namely, artificial sea water solution, Hank's solution, 0.5 M sulfuric acid, and 0.5 M hydrochloric acid solution has been investigated. Corrosion rates are evaluated using open circuit potential, current time transient, Tafel extrapolation potentiodynamic polarization curves, and electrochemical impedance spectroscopy. The results show that this alloy has lower corrosion rate in alkaline solution due to formation of thick, compact, and stable passive film. In acid solution corrosion rate is higher as the passive film is less compact, porous, and unstable. In general, the material is more active in C1? ion containing solution. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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    Simple diphenylamine based D-?-A type sensitizers/co-sensitizers for DSSCs: A comprehensive study on the impact of anchoring groups
    (Royal Society of Chemistry, 2019) Kesavan, R.; Abdellah, I.M.; Singh, S.P.; El-Shafei, A.; Vasudeva Adhikari, A.V.
    Herein, we report the design, synthesis and characterization of a new series of simple donor-? spacer-acceptor/anchor (D-?-A) type diphenylamine based metal-free organic dyes possessing three different anchoring groups, viz. 4-aminobenzoic acid (DTP), 2-(4-nitrophenyl)acetonitrile (DTN), and barbituric acid (DTB), connected with 2-(thiophene-2-yl)-acetonitrile, as effective sensitizers and co-sensitizers in Dye Sensitized Solar Cells (DSSCs). They were subjected to photophysical, electrochemical and theoretical studies. The dyes exhibited characteristic ?abs and ?emi in the range of 445-485 and 545-570 nm, respectively. Both optical and electrochemical band gaps were found to be in the range of 2.2 to 2.35 eV. The driving forces for injection (?Ginj), recombination (?Grec) and regeneration (?Greg) processes were evaluated to understand their feasibility. Finally, the DSSC devices were fabricated employing the new dyes as sensitizers as well as co-sensitizers along with the Ru(ii) based N3 dye. Interestingly, DTP carrying 4-aminobenzoic acid as the anchoring group shows the best photoelectrochemical performance, viz. photovoltaic conversion efficiency (PCE) = 4.4%, open circuit potential (VOC) = 0.577 V, and short-circuit current density (JSC) = 9.06 mA cm-2 with a broad incident photon conversion efficiency (IPCE) spectrum. Co-sensitization of the dyes brought about enhanced VOC values, compared to the N3 dye alone. Finally, different interface resistance values obtained from the electrochemical impedance spectroscopy (EIS) circuit fitting were used to study the fundamental processes of energy conversion. © 2019 the Owner Societies.
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    Influence of weld parameters on the tribocorrosion behaviour of friction stir welded AA5052 in the marine environment
    (Elsevier Ltd, 2025) Anantharam, G.S.; Bhole, K.B.; Kuriachen, B.; Arya, S.B.
    The study involves tribocorrosive investigation of FSW-AA5052 formed at tool-speeds of 800, 1000, and 1200 rpm and welding-speeds of 60, 80, and 100 mm/min, for which Pin-on-disc tests in conjunction with open-circuit-potential and potentiodynamic-polarization techniques were utilised. For microstructures EBSD, Optical images and XRD were taken. Results revealed that cast (?1.212 V; 332.43 ?m/year), 800 rpm (?1.213 V; 433.51 ?m/year) and 1000 rpm (-1.236 V; 227.45?m/year) welded samples showed better performance than all the 1200 rpm welded samples. Frictional characteristics of 800 rpm (CoF-1.28) and 1000 rpm (CoF-1.32) samples were better than other samples due to uniform and stable passivation. Elemental analysis showed Oxides and Chlorides of Al and Mg formed over the worn surfaces. © 2025 Elsevier Ltd