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Author

M. Siva shankar

Other affiliations: B. S. Abdur Rahman University
Bio: M. Siva shankar is an academic researcher from KCG College of Technology. The author has contributed to research in topics: Metallurgy & Materials science. The author has an hindex of 2, co-authored 2 publications receiving 82 citations. Previous affiliations of M. Siva shankar include B. S. Abdur Rahman University.

Papers
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Journal ArticleDOI
15 Jan 2016-Wear
TL;DR: In this article, the effects of surfactants on microhardness, scratch, wear and friction behavior of the Ni-P-nano-TiO 2 composite coatings were investigated.

53 citations

Journal ArticleDOI
15 Nov 2017-Wear
TL;DR: In this article, the corrosion and erosion corrosion behavior of the Electroless Ni-P-rGO coatings were studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution.

50 citations

Journal ArticleDOI
TL;DR: In this paper , the influence of post-process and in-process cooling on microstructural, mechanical and electrochemical behavior of wide-area stir zone (WSZ) processed with overlapping friction stir processing (OL-FSP) was studied.
Abstract: In the current investigation, the influence of post-process and in-process cooling on microstructural, mechanical and electrochemical behavior of wide-area stir zone (WSZ) processed with overlapping friction stir processing (OL-FSP) was studied. The WSZ was successfully prepared in Al5083 aluminum alloy using multi-pass friction stir processing (FSP) with 50% pin overlapping under both cooling conditions. The post-process cooling FSP (PP-FSP) used solid CO2 as cooling media, whereas the in-process cooling FSP (IP-FSP) used water as cooling media. The microstructural investigations revealed that grain refinement is uniform in each overlapping pass for both cooling conditions. The IP-FSP resulted in better grain refinement than PP-FSP. Three different types of intermetallic particles (needle-shaped Fe-containing, rod-shaped Mg-containing, and very small Mg-containing grain boundary intermetallic particles) were identified in the base alloy and OL-FSP samples. The hardness was observed to be constant across the WSZ due to the uniform grain refinement, and the IP-FSP sample has better hardness and strength than the PP-FSP sample due to the better cooling effect. The elongation followed a similar trend of hardness. The electrochemical findings revealed that the IP-FSP sample has better corrosion resistance than the PP-FSP sample due to the better grain refinement and fine intermetallics.

Cited by
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Journal ArticleDOI
TL;DR: In this article, the mechanism of electrodeposition and effect of operational parameters and deposit microstructure, together with the mechanical, electrochemical and tribological characteristics of Ni Co alloys and included particle, composite deposits.
Abstract: Ni Co alloy electrodeposits have been widely employed in industry due to their good corrosion and wear resistance, high mechanical strength, moderate thermal conductivity and outstanding electrocatalytic and magnetic properties. This review aims to provide an insight into the mechanism of electrodeposition and effect of operational parameters and deposit microstructure, together with the mechanical, electrochemical and tribological characteristics of Ni Co alloys and included particle, composite deposits. Potential applications of the coatings have also been considered in applications as diverse as additive manufacturing, micro-tools, micro-sensors, electronic imaging and electrochemical energy conversion.

152 citations

Journal ArticleDOI
15 Oct 2016-Wear
TL;DR: In this article, a new nano-additive for improved internal combustion engine oils designed for increased fuel economy and a cleaner environment was investigated under reciprocating test conditions to simulate a piston ring/cylinder liner contact.

131 citations

Journal ArticleDOI
TL;DR: In this article, the authors explore the various covalent/non-covalent approaches for the modification of graphene and GO and discuss the different types of single and multi-layer graphene-based anticorrosion coatings with a focus on the different mechanisms underlying the corrosion protection behavior.

85 citations

Journal ArticleDOI
TL;DR: In this article, reduced graphene oxide (rGO)/titanium dioxide (TiO2) composite coatings were successfully prepared on titanium substrate by applying plasma electrolytic oxidation (PEO) process and the effect of anti-corrosion ability of rGO nanosheets synthesized by modified Hummer's method on the physical properties, corrosion and Mott-Schottky behaviors of the coatings was investigated.

62 citations

Journal ArticleDOI
TL;DR: In this paper, an environmentally-friendly pretreatment has been used for electroless NiP on AZ31 magnesium alloy and the coatings were characterized by using scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS), and via X-ray diffraction (XRD).
Abstract: In this paper, an environmentally-friendly pretreatment has been used for electroless Ni P on AZ31 magnesium alloy. Saturated aqueous NaHCO3 solution was used to form carbonate compounds on the surface of the substrate prior to Ni-P/nano-SiC electroless plating. Various amounts of nano-SiC particles were used to enhance the hardness, corrosion and wear resistance of the coatings. The coatings were characterized by using scanning electron microscopy (SEM) equipped with energy dispersion spectroscopy (EDS), and via X-ray diffraction (XRD). Polarization tests were carried out for investigating the corrosion resistance of the coatings. Pin on disk tests were used to study wear behavior of the coatings. The effect of heat treatment temperatures on the coatings structure, hardness and corrosion behavior were studied. However, the hardness of the substrate decreased due to the growth of Mg grains at high temperatures. Moreover, heat treated Ni P coatings at 300 °C exhibited better corrosion resistance compared to other heat treatment temperatures. As a result, the temperature of 300 °C was chosen as the optimum temperature. Results also indicated that 1 g L−1 nano-SiC in plating bath provided a uniform composite Ni P electroless coating with high hardness (795 HV) and corrosion resistance. Adding more nano-particles to the bath resulted in agglomeration of the particles and did not have positive effect on properties. The wear behavior of coatings were investigated using steel pin (AISI 52100) as the counterpart in pin-on-disk wear test. The optimum as-plated composite coating (Ni-P/1SiC) produced the best wear resistance at a rate of 4.2 × 10−5 mm3 N−1 m−1 wear rate and the highest corrosion resistance belonged to Ni-P/1SiC after annealing at 300 °C.

59 citations