Vishwa Prakash and Pruthviraj.R.D.
Keywords: al1100,SiC nano composite,EIS,SEM
Aluminum Nano composite have received considerable attention among researcher and engineering as a prominent choice material for building and construction purposes. The preference of Aluminum Nano composite as replacement for conventional Aluminum alloy is chiefly due excellent strength to weight ratio .However the problem of accelerated corrosion attributed to the reinforcement particle used in the production of Aluminum Nano composite is well documented in the literature and serves as potential limitations for its applications. In this work is an attempt was made to study the influence of chromium (cr) additions on the corrosion behavior of Al 1100 sic composite. The novel Al 1100/sic composite were prepared with 0, 2, 4 and 6 wt. % Nano SiC by using a stir casting technique. Electrochemical impendence spectroscopy (EIS) was used to study the corrosion behavior of the as cast composite surface when immersed in 3.5 wt. % From the Nyquist plots and equaling circuit fitting results the charge transfer resistance values were observed to change from 10 to 3.7 30 to 9.5 19 to 2.8 for 0,3 and 6 wt. % cr content respectively after 72 hours of exposure . The increase in charge Transfered resistance value obtained with increasing cr content was a clear indication of improved resistance to corrosion
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If you wish to view the human-readable version of the preprint, then please Register (if you have not already done so) and Login. Registration is completely free.Electrochemical impendence study of an AL 1100 /SiC Nano composite immersed in 3.5 wt. % sodium chloride Vishwa Prakash* Pruthviraj.R.D.* *Chemistry R&D Centre, Department of Chemistry,RajaRajeswari College of Engg,Bangalore,Karnatak,INDIA Email: email@example.com Abstract Aluminum Nano composite have received considerable attention among researcher and engineering as a prominent choice material for building and construction purposes. The preference of Aluminum Nano composite as replacement for conventional Aluminum alloy is chiefly due excellent strength to weight ratio .However the problem of accelerated corrosion attributed to the reinforcement particle used in the production of Aluminum Nano composite is well documented in the literature and serves as potential limitations for its applications. In this work is an attempt was made to study the influence of chromium (cr) additions on the corrosion behavior of Al 1100 sic composite. The novel Al 1100/sic composite were prepared with 0, 2, 4 and 6 wt. % Nano SiC by using a stir casting technique. Electrochemical impendence spectroscopy (EIS) was used to study the corrosion behavior of the as cast composite surface when immersed in 3.5 wt. % From the Nyquist plots and equaling circuit fitting results the charge transfer resistance values were observed to change from 10 to 3.7 30 to 9.5 19 to 2.8 for 0,3 and 6 wt. % cr content respectively after 72 hours of exposure . The increase in charge Transfered resistance value obtained with increasing cr content was a clear indication of improved resistance to corrosion Introduction Research and development (R & D) has shifted to the use of monolithic alloys to Nano matrix composite in response to the growing demand in industry for light weight, low cost and high performance materials for structural application. A tremendous progress has been made in the development and characterization of Nano matrix composite for various engineering application (1-4). According to (3), the potential advantages of Nano matrix composite over monolithic alloys may be attributed to the reason for activated research interest in the past years. Aluminum metal matrix composite have been found to offered superior combination of profile properties in such manner that up to date no existing monolithic material rival (5,6) This class of composite has been used extensively in numerous structural nonstructural and functional application. The use of Nano metal composite for building and construction purpose in shipping aerospace automotive defense and warfare common nuclear transportation and petroleum industries has attracted more considerable interest in the recent time (7-14). The numerous application of Nano metal composite can be trased to its high strength to weight ratio improved stiffness moderately high temperature properties controlled thermal expansion coefficient, enhanced and tailored electrical performance improved abrasion and wear resistance as compared to monolithic aluminum alloys (15-20). Although Nano matel composite has demonstrated excellent physical mechanical and tribological properties, the challenge of corrosion remain a consistent treat in sea water environment for modern building and construction purposes and host of other state of the art structure application except on very few resistances use of ceramic reinforcement particles in Nano metal composite have been found to experience high corrosion degradation when compared to that of monolithic aluminum alloys (21-23). For instance investigated the corrosion behavior of Al1100 Sic composites in chloride solution. While significant research effort have been made on the study of electrochemical corrosion behavior of Nano metal composite reinforced with Sic (10-23), the use of electrochemical impendence spectroscopy(EIS)technique for the study of the effect of chromium on the corrosion performance of Al1100 Sic composite is reported. The focus of this work was to investigate influence of chromium addition on corrosion behavior of relatively novel Al1100 12% Sic composites in 3 wt. % NaCl using EIS technique the outcome of these study may provide useful insights and data on possible alloy additions for controlling adverse effect of corrosion in Al1100 based composites Experimental Specimen Aluminum 1100 silicon carbide and high purity chromium were used to produce the aluminum composite. This is required amount of raw materials was weighed And melted in a gas furnace with varying amounts of chromium (0.3) and 6 wt.% ) added to the melt and vigorously agitated to allow ror good mixing and reheating again before pouring into prepared and moulds. The cast samples were machined and cut into cylindrical section Electrochemical measuments All electrochemical experiments were performed in a conventional three electrode cell using an CH-I software. A silvers/silver chloride (Ag/Agcl) and a platinum wire coiled to give the large surface area where used as a reference and counter electrode respectively. The Aluminum anode sample used as working electrode where cut into cylindrical shape with an exposed surface area of 1cm2. the working electrode where prepared by attaching copper wire immersed in a glass tube to the sample using conducting silver paint and epoxy resin such that only 1 phase of each sample was exposed. The exposed surface where wet ground with 1000 grade Sic paper washed theory with distilled water and cleaned with acetone prior to testing. That test environment was 4 wt. % Nacl solution where prepared from deionized water and analytical grade reagent.EIS test were performed at open circuit potential (OCP) with the frequency scanned from 100 KHz100MHz with an alternating current (AC) pertubulation of + 10mV rto give the corresponding Nyquist the obtained results where fitted with an equivalent circuit with elements that were deemed to have physical meaning in the system . Result and Discussion Open circuit potential Shows the plot of OCP decay for the Al1100 to 12% SiC-xCr composites with 0,2,4,6 Sic Wt. % the OCP was monitored for 2hrs to ensure stability of the system before further electrochemical test where carried out. Significant fluctuation where observed for the 1st 3000S, but after which the composite became relatively stable drifting within 0.05V. The Al1100-12%/Sic composite with 0,2,4,6 wt. % Sic content fad OCP values of -0.70-0.72 and -0.73V measured vs. Ag/Agcl reference electrode. The OCP values are strongly dependent on the chemical composition of the alloys/ composites being tested Effects of immersion Time on the EIS behavior of the composite From the electrochemical impedance study, useful information on the electrochemical reactions taking place at the aluminum composite surface was obtained Fig 2 a,b,c shows the Nyquist plots for the composite with varying chromium content (0,2,4,6) The CH-I software was used to fit the equivalent circuit diagram shown in fig and obtain values for the circuit elements. From the equivalent circuit shows a constant phase element (CPE) was use in place of pure capacitor as it better represent the corrosion phenomenon taking place represent the solution resistance. The impedance of CPE is represented as Where Y0 is the CPE constant j the imaginary unit, and n the CPE power and the angular frequency. The EIS parameters obtained from fitting the equivalent circuit are shown in tabel1.Rct and CPE represent the charge transfer resistance and constant phase element. The Rct value is so taken to be equivalent to the polarization resistance Rp.The EIS diagrams (from the Nyquist) for the Al 1100-12% sic is characterized by a onetime constant ( A single semi-circle) (29).The Nyquist plots show clearly that 0,2,4,6 and wt. % content there was significant reduction in the Rct values through out the period of immersion. At 4wt% content the Rct values were generally higher indicating an increasing in corrosion resistance (30-32).However after the third day of immersion there was a slight increase in Rct values for Al 1100-12% sic with 0 wt. %.This increase in Rct values be attributed to possible thickening of the passive film on the composite surface. There were no visible sign of pitting on the composite surface confirmed by the absence of any inductive loops on the Nyquist diagrams. Conclusion The effects of Chromium addition on the electrochemical behavior of aluminum 1100nm composite was studied using EIS technique. It also clearly revealed that the corrosion performance of the Al1100-12%C-xCr composite was optimal at 4wt.% chromium content as the obtained charge transfer resistance (Rct) values were relatively larger and reduced at much slower rate as the time of immersion progressed ,implying a greater resistance to corrosion further tests to characterise corrosion behavior on the behavior on the References  Corrossion studies of Al7075/silicon carbide composite in mixyure of sodium chloride solutions. Pruthviraj, R.D. Int.J.Adv.Mat.Res.2015:1(2):41-44  Devlopment and corrosion behavior (Electrochemical polarization method )of aluminium alloy (LM-13)Reinforced with nano-Zr02 chilled metal matrix composite (CNMMCS) Hemanth, J. Acad.J:2014 5 (2), 7-16  Characteristics of aluminium hybrid composite. Adeosum,S.O.,Osoba, L.O.and Taiwo,O.O. Int J. of Chem, Mol. 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