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Öğe Corrosion behavior of Al-60 vol.% SiCp composites in NaCl solution(Elsevier Science Bv, 2004) Candan, S; Bilgic, EIn this study, corrosion behavior of pure Al and Al-4 wt.% Mg alloy matrix composites, comprising 60 vol.% SiC particles, has been investigated. Composites were produced by pressure infiltration technique at 750 degreesC. The corrosion tests were carried out in 3.5 wt.% NaCl environment up to 28 days. The weight loss of the composites increased with increasing duration time up to 3-5 days then remained constant. Scanning electron microscopy (SEM) analysis showed that Al-4 wt.% Mg alloyed matrix composite exhibited higher corrosion resistance than pure Al matrix composite although potentiodynamic polarisation measurements showed higher i(corr) values of Al-4 wt.% Mg alloyed matrix composites than pure Al matrix composites. Experimental results revealed that precipitation of Mg2Si as a result of reaction between Al-Mg alloy and SiC particle has a beneficial effect on corrosion resistance of Al-4Mg alloy matrix composites due to interruption of the continuity of the matrix channels within the pressure infiltrated composites. (C) 2004 Elsevier B.V. All rights reserved.Öğe Effect of SiC particle size on corrosion behavior of pressure infiltrated Al matrix composites in a NaCl solution(Elsevier Science Bv, 2004) Candan, SIn this study, the effect of SiC particle size on corrosion behavior of Al-60 vol.% SiC particle composites has been investigated. Three different SiC particle composites, having mean diameters of 13, 23 and 37 mum, were produced by a pressure infiltration technique at 750 degreesC. The corrosion tests were carried out in 3.5 wt.% NaCl environment up to 28 days. Experimental results showed that the weight loss of the composites increased with increasing particle size and exposure time. However, weight loss of the composites having 13- and 23-mum particle sizes remained almost constant after 3-5 days of exposure time. Scanning electron microscopic (SEM) analysis and potentiodynamic polarization measurements revealed that composite having 13-mum SiC particles exhibited higher corrosion resistance than that of the composites having 23 and 37-mum SiC particles. Experimental results showed that intermetallics as a result of reaction between At and SiC particle has a beneficial effect on corrosion resistance of the composites due to interruption of the continuity of the matrix channels within the pressure infiltrated composites. (C) 2004 Elsevier B.V. All rights reserved.Öğe Radio frequency-induced plasma polymerization of allyl alcohol and 1-propanol(Tubitak Scientific & Technological Research Council Turkey, 2002) Candan, SThe effect of the composite parameters' plasma power (P)-to-monomer flow rate (phi) ratio (P/phi) in the plasma polymerization of allyl alcohol and 1-propanol was studied. The radio-frequency plasmas of deposits operated at low power (1-15 W) were investigated using deposition rate measurements. Detailed chemical information on the plasma polymers was obtained by X-ray photoelectron spectroscopy (XPS). The study of the surface chemistry of films created from allyl alcohol and 1-propanol demonstrates the importance of the double bond for good C-O group retention. The deposition rates of both plasma polymers were found to increase with increasing P. The comparison of the deposition rates of plasma-deposited allyl alcohol and I-propanol suggests that the double bond is involved in the deposition mechanism.
