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Morphological and Mechanical Behaviour of Cu–Sn Alloys—A review
M. Karthik,J. Abhinav,Karthik V. Shankar 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
The current paper reviews the research conducted on wrought Cu–Sn, Cu–Sn–Ti and Cu–Sn–Zn alloys intending to revealthe details on morphological and mechanical behaviour during various manufacturing operations. The motivational force ofemploying copper-based alloys in automotive and marine industries is its mechanical properties and corrosion resistance. One of the important factors that afect mechanical properties is micrograph. The grain size, grain distribution, heat treatment, morphological behaviour and the intermediate phase formation highly infuence the properties of the copper-basedalloys. Moreover, the change in microstructure through diferent manufacturing process (wrought process), heat treatmentand addition of alloying element also improve the mechanical and thermal properties. This paper aims to review the majorconclusions on improving the microstructure and mechanical behaviour of wrought Cu–Sn, Cu–Sn–Zn and Cu–Sn–Ti alloys. Analysis and observations of each investigation were prepared by incorporating the morphological results obtained throughOptical Microscope, Transmission Electron Microscope, Scanning Electron Microscope, X-ray Difraction Technique andElectron Dispersive Spectroscopy. This review paper also attempts to give the areas of future researches and developmentsthat can be made for these wrought alloys.
Hybrid sol-gel/thiourea binary coating for the mitigation of copper corrosion in neutral medium
Karthik, Namachivayam,Lee, Yong Rok,Sethuraman, Mathur Gopalakrishnan Elsevier 2017 Progress in organic coatings Vol.102 No.2
<P><B>Abstract</B></P> <P>A versatile approach was adopted for mitigation of the corrosion of copper in neutral medium. Initially, a well-known corrosion inhibitor (viz., a thiourea (TU) film) was electrodeposited over the copper surface. Secondly, an environmentally-friendly hybrid sol-gel (Hy) coating consisting of (3-glycidoxypropyl)methyldiethoxysilane (GPTMS) and tetraethyl orthosilicate (TEOS) was immobilized on the thiourea-modified copper surface via an epoxy amine cross-linking reaction to form a binary coating. Thereafter, the individual and combined characteristics of the binary coating were studied via spectroscopic and microscopic analyses. The effectiveness of these binary coatings on mitigation of copper corrosion was scrutinized by electrochemical techniques, viz., electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) studies. The results revealed that the binary coating mitigated copper corrosion to a great extent in a complementary and robust manner.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This work explores the formation of thiourea and hybrid sol-gel coatings on copper. </LI> <LI> Thiourea alone protects copper from corrosion only in a limited range. </LI> <LI> Binary coating of hybrid sol-gel and thiourea provide robust copper corrosion mitigation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Karthik Varma,Augustine Amalraj,Chandradhara Divya,Sreeraj Gopi 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.1
Sarcopenia represents the progressive loss of skeletal muscles, which occurs as a result of aging. Plant-derived phytochemicals have the potential ability to manage sarcopenial conditions. The randomized, placebo-controlled, double-blind clinical study involving thirty subjects evaluated the efficacy of Cureit™ supplementation in the management of sarcopenial conditions by measuring the variables, such as hand grip strength, weight lift strength, time/distance before feeling tired after cycling, walking and climbing stairs, and Karnofsky performance scale index along with effects on general fitness, such as protein, urea, oxidative stress, and hematology parameters. The results showed that Cureit supplementation resulted in a significant increase of 1.43% (P < .001) in the handgrip strength compared with placebo. The weight-lifting capacity of subjects supplemented with Cureit showed an increase of 6.08%, whereas placebo showed a 4.54% decrease after the end of the study period. The results demonstrated that the Cureit tended to have a positive impact on distance covered before feeling tired as shown by an increase (P = .09) of 5.51%, compared with placebo group, which showed an increase of 2.29%. The time taken to walk the same distance was reduced in the Cureit group (1.15%), whereas in the placebo group, it was increased (2.02%). Cureit plays a significant role in the management of sarcopenia by anti-inflammatory action, increased hand grip strength, antifatigue effects, and muscle protein management. Clinical Trials Registry-India registration no. CTRI/2018/05/014176