F. Asuke, M. Abdulwahab, O.S.I. Fayomi, V.S. Aigbodion, A.P.I. Popoola
Keywords: Keywords: Al-Si/SiC composite, inhibitor efficiency, thin film, interface
Abstract:
The inhibitive action of potassium iodide (KI) on the corrosion of Al-Si/SiC particulate composite in 3.65% NaCl solution was investigated using gravimetric and potentiodynamic polarization techniques at 298K. The results showed that KI in NaCl-aluminium alloy/SiC composite environment decreased the corrosion rate at all concentrations considered. Inhibitor efficiencies (IE) of 97.17, 97.34 and 97.57% with 0.5 g/v addition using gravimetric method were achieved at 92, 196 and 288 h of exposure time respectively. The IE from the potentiodynamic polarization method in both conditions was significantly enhanced. The high resolution scanning electron microscope (HRSEM) for surface morphology of as-corroded uninhibited condition showed pits and cracks formation than as-corroded inhibited condition. The additions of KI as corrosion inhibitor indicates a higher potential value, IE and polarization resistance with decreased in current density. The two methods employed for the corrosion assessment of the composite was in agreement and mixed-type corrosion exists which followed Langmuir adsorption isotherms.
Because you are not logged-in to the journal, it is now our policy to display a 'text-only' version of the preprint. This version is obtained by extracting the text from the PDF or HTML file, and it is not guaranteed that the text will be a true image of the text of the paper. The text-only version is intended to act as a reference for search engines when they index the site, and it is not designed to be read by humans!
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.
ISSN Inhibitive 1466-8858 action Volume 16, Preprint 36 of stir-cast Al-Si/SiC submitted 17 May 2013 of potassium iodide on the corrosion in NaCl-KI interface F. Asuke1,2, M. Abdulwahab1,2, O.S.I. Fayomi2,3, V.S. Aigbodion4, A.P.I. Popoola2 1 Department of Metallurgical and Materials Engineering, Ahmadu Bello University, Zaria, Nigeria 2 Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Pretoria, South Africa 3 Department of Mechanical Engineering, Covenant University, Ota, Ogun State, Nigeria 4 Department of Metallurgical and Materials Engineering, University of Nigeria, Nnsuka, Nigeria *Corresponding author: aigbodionv@yahoo.com ABSTRACT The inhibitive action of potassium iodide (KI) on the corrosion of Al-Si/SiC particulate composite in 3.65% NaCl solution was investigated using gravimetric and potentiodynamic polarization techniques at 298K. The results showed that KI in NaClaluminium alloy/SiC composite environment decreased the corrosion rate at all concentrations considered. Inhibitor efficiencies (IE) of 97.17, 97.34 and 97.57% with 0.5 g/v addition using gravimetric method were achieved at 92, 196 and 288 h of exposure time respectively. The IE from the potentiodynamic polarization method in both conditions was significantly enhanced. The high resolution scanning electron microscope (HRSEM) for surface morphology of as-corroded uninhibited condition showed pits and cracks formation than as-corroded inhibited condition. The additions of KI as corrosion inhibitor indicates a higher potential value, IE and polarization resistance with decreased in current density. The two methods employed for the corrosion assessment of the composite was in agreement and mixed-type corrosion exists which followed Langmuir adsorption isotherms. Keywords: Al-Si/SiC composite, inhibitor efficiency, thin film, interface © 2013 University of Manchester and the authors. This is a preprint1of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN 1466-8858 Volume 16, Preprint 36 submitted 17 May 2013 1. Introduction Metal matrix composite (MMCs) as a new generation of materials found wide range of industrial application in aerospace and automobile [1]. In these materials, a reinforcement usually ceramics are incorporated to obtain an excellent properties; such as specific stiffness, high elastic modulus, wear resistance [2,3]. Among the MMCs, aluminium matrix composites (AMCs) are gaining considerable amount of industrial importance because of their excellent combination of physical, mechanical and electrochemical properties. Due to their interesting combination of properties, these materials are being used in many engineering applications such as automobile; pistons, track shoes, brake drums, cylinder liners [4], marine [5,6], mining and mineral processing applications [7,8]. One of the major limitations of AMCs has been low corrosion resistance in aqueous environment. Several researches have been carried out extensively on the corrosion of AMCs and common reinforcements such as SiC and Al2O3. Fang et al. [9] studied the synergistic effect of wear and corrosion on Al2O3 particulate reinforced 6061 aluminium matrix composite, and reported that reinforcement was detrimental to the corrosion resistance of the aluminium metal matrix. Based on the work reported by Saraswathi et al [5] on the corrosion behaviour of Al-Si/SiC composite in three different media, namely synthetic mine water, 3.5%NaCl solution and 3.5% NaOH solution through immersion technique, and reported that the corrosion rate in 3.5%NaCl solution was minimum followed by synthetic mine water while that of 3.5% NaOH solution was the highest. In their work, the use of inhibitor was not considered. However, the requirements needed from this composite are still insufficient in an aggressive-corrosion service condition [10]. Hence, methods for enhancing these limitations become necessary. Since corrosion prevention has been area of focus among researchers because of the aforementioned © 2013 University of Manchester and the authors. This is a preprint2of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSNapplication 1466-8858 Volume 16, Preprint 36 various methods submitted 17 May of the composite. Although over the years, have been put 2013 forward to address this limitation [11,12]. One of the methods of combating and controlling corrosion in aqueous environment is the application of corrosion inhibitors [13,14]. Asuke et al., [11] studied the corrosion inhibition of Al-Si/SiC composite with palm wine as inhibitor using gravimetric technique. They reported a maximum inhibition efficiency of 47.63% at 30oC with optimum concentration of 1.0% v/v. In the present study the corrosion inhibition of Al-Si/SiC composite in 3.65% NaCl-KI interface have been investigated using gravimetric and potentiodynamic polarization techniques. 2. Experimental procedures 2.1 Materials and sample preparation A stir-cast aluminium composite specimen of dimension 20 x 20 x 3 mm as-received with chemical composition of 5%Si, 15%SiC and 80%Al was used as coupons for the corrosion study in 3.65%NaCl solution. Initially, the coupons were mechanically polished with emery papers from 600 down to 1000 grit. The samples were degreased in ethanol, dried, weighed and stored in a desiccator. The initial weight of each sample was taken and recorded. Corrosion studies were conducted at room temperature (298K). 2.2 Gravimetric measurement (GM) The gravimetric corrosion test was carried out on the previous weighed samples with and without inhibitor at 298K. The volume of the NaCl solution was 100 mL with and without the addition of potassium iodide (KI) inhibitor. The KI inhibitor concentration was varied from 0.5, 1.0, 1.5 and 2.0 g/v in 100 ml of 3.65g of NaCl solution. For each sample, using gravimetric method, the samples were washed, dried and weight taken at interval of 96, 192 and 288 h of exposure time. The corrosion rate and inhibitor efficiency were determined along with the degree of surface coverage for each inhibitor concentration at 298K. © 2013 University of Manchester and the authors. This is a preprint3of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN2.3 1466-8858 Electrochemical measurement Volume 16, Preprint 36 submitted 17 May 2013 The potentiodynamic polarization (PP) and linear polarization resistance was used to study the corrosion inhibition of the Al-Si/SiC composite in NaCl solution. In the electrochemical test, a glass corrosion cell kit with a platinum counter electrode, a saturated Ag/Ag reference electrode and Al-Si/SiC composite sample as working were used. The working electrodes samples were positioned at the glass corrosion cell kit, leaving 1 cm2 surfaces in contact with the solution. Polarization test were carried out in a solution consisting of 3.65%NaCl solution at room temperature using a potentiostat. The polarization curves were determined by stepping the potential at a scan rate of 0.003V/sec. The corrosion rate and potential were estimated by the Tafel extrapolation method using both the anodic and cathodic branches of the polarization curves. 2.4 Surface morphology The surface morphology of as-corroded uninhibited and inhibited aluminium sample was observed with high resolution scanning electron microscopy (model: Joel JSM 7600F). 3. Results and discussion 3.1 Results The results obtained from the gravimetric corrosion evaluation for the aluminium alloy composite in 3.65% NaCl solution along with the variation in inhibitor concentration can be found in Table 1 and Figure 1. Table 2 shows the electrochemical corrosion data obtained for aluminium alloy composite-3.65% NaCl/KI interface. Figure 2, indicates the polarization curves for the composite. The Micrographs of the surface morphology of ascorroded uninhibited/inhibited composite in 3.65% NaCl/KI condition are presented in Figures 3 and 4. Percentage inhibitor efficiency (%IE) using different methods for corrosion assessment can be found in Figure 5. While in Figure 6, the Langmuir adsorption isotherms for the environmental condition have been demonstrated. © 2013 University of Manchester and the authors. This is a preprint4of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN3.2 1466-8858 Discussion Volume 16, Preprint 36 submitted 17 May 2013 3.2.1 Gravimetric measurement Potassium iodide (KI) was used for the study of mild steel-HCl corrosion behavior with different inhibitor concentrations at 298K. In each concentration, the corrosion rate (mm/yr) was calculated and the inhibitor efficiency IE (%) was determined using equation (1) and (2) below; CR = ௐିௐ (1) ௧ IE (%) = ሺோିோሻଵ ோ (2) Where ܹ and ܹܽ are the specimen weight before and after immersion in the tested solution, ܣis the area of the mild steel specimen and ݐis the exposure time (hr). ܴܽܥand ܴܥare the corrosion rate in the absence and present of inhibitor respectively A 3.65% NaCl solution was used as an environment to study the corrosion inhibition of Al-Si/SiC at 298K. Results show that corrosion rate (CR) of the composite decreased with addition of KI corrosion inhibitor and exposure time of 96, 192, 288 h (Tables 1, Figure 2). At the interface and various exposure times, corrosion rate decreased throughout with excellent percentage inhibitor efficiency (% IE). Specifically, Figure 2 shows a decreased in corrosion rate with concentration of inhibitor for all the immersion time at 298K. Considering an exposure time of 96 h, higher % IE was calculated to be 97.17% at 0.5 g/v KI addition. While at 0.5 g/v inhibitor concentration for 192 and 288 h exposure time, corrosion rate/IE were found to be 0.0952/97.34% and 0.0067/97.57% respectively. However, corrosion resistance of aluminium composite in 0.5 g/v KI is higher than those obtainable at other concentrations. This behaviour have been attributed to the formation of thin oxides as evidenced in the EDS (Figures 4) which interfere with the anodic and cathodic reaction. © 2013 University of Manchester and the authors. This is a preprint5of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSNTherefore 1466-8858 formation 16,becomes Preprint 36 submitted 17 May 2013 of pits and their Volume growths difficult. The thin layer of the oxides adheres to the metal surface resulting into a decreased in the corrosion rate. Table 1 Corrosion rate (CR), Inhibition efficiency and surface coverage (θ) for Al-Si/SiC in 3.65%NaCl solution without and with varying concentration of KI obtained from gravimetric technique at 298K. Exposure time (h) Concentration of inhibitor (g/v) 96 0 0.5 1.0 1.5 2.0 0 0.5 1.0 1.5 2.0 0 0.5 1.0 1.5 2.0 192 288 CR 0.5M NaCl (mm/day) 1.0219 0.0185 0.0346 0.0453 0.3192 0.5565 0.0952 0.0176 0.0303 0.1719 0.3220 0.0067 0.0120 0.0165 0.1149 Inhibition Efficiency (%) for NaCl ------97.17 95.51 92.62 59.31 ------97.34 95.75 92.91 59.81 ------97.57 96.24 93.52 64.38 Surface coverage (θ) for NaCl ------0.9717 0.9551 0.9262 0.5931 ------0.9734 0.9575 0.9291 0.5981 ------0.9757 0.9624 0.9352 0.6438 Corrosion rate (mm/yr) 1.2 1 0.8 96 h 0.6 192 h 0.4 288 h 0.2 0 0 1 2 3 4 Concentration of inhibitor (g/v) 5 6 Fig. 1. Variation of corrosion rate with concentration of inhibitor for aluminium in 3.65% NaCl without and with varying concentration of KI at 298K. © 2013 University of Manchester and the authors. This is a preprint6of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN3.2.2 1466-8858 Potentiodynamic polarization Volume 16, Preprint 36 submitted 17 May 2013 From the potentiodynamic measurement for Al-Si/SiC composite (Table 2), potentiodynamic polarization-corrosion rate (PP-CR), potentiodynamic polarization- corrosion density (PP-Icorr), and linear polarization resistance (LPR) were used as criteria for evaluation of corrosion resistance of aluminium composite in the environment. Figure 2 indicate the polarization curves for Al-Si/SiC at 298K. In general, the composite demonstrated a decreased corrosion rate and current density with addition of KI inhibitor at all concentrations. While the corrosion potential (Ecorr) and polarization resistance (Rp) increases with inhibitor concentrations. This is in agreement with previous studies [15]. The inhibited composite showed that corrosion rate decreased from 2.14E-03 mm/yr to 7.70E-08, 6.66E-07, 8.64E-07 and 1.727E-03 mm/yr at 0.5, 1.0, 1.5 and 2.0 KI additions respectively. It is important to note that corrosion resistance of Al-Si/SiC-NaCl-0.5g/v KI interface is much higher than other interfaces with IE of 99.99% obtained at 0.5 g/v KI addition for PP and 95.57% at 188 h for GM. Similar result was reported [15]. However, based on the changes in anodic and cathodic branches for both environments, the inhibitor is believed to be mixedtype. Table 2 Electrochemical corrosion data obtained for Al-Si/SiC in 3.65% NaCl solution without and with varying concentration of KI obtained from polarization technique at 298K. S/N C (g/v) Icorr ba (v/dec) (A/cm2) 1 2 3 4 5 0 0.5 1.0 1.5 2.0 8.83E-07 3.17E-11 2.75E-10 3.57E-10 7.12E-07 LPR -Ecorr (V) Rp (Ωcm2) 0.15529 0.33916 2.3665 1.5361 -0.3249 2.60E+04 1.11E+09 1.06E+09 5.41E+08 5.58E+05 CR (mm/yr) 1.2293 0.75272 0.75272 0.62152 1.2293 2.14E-03 7.70E-08 6.66E-07 8.64E-07 1.727E-03 © 2013 University of Manchester and the authors. This is a preprint7of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN 1466-8858 Volume 16, Preprint 36 submitted 17 May 2013 Fig. 2. Linear polarization of Al-Si/SiC in 3.65% NaCl solution without and with varying concentration of KI from gravimetric technique at 298K. 3.2.3 Scanning electron microscope-Energy dispersive spectroscopy (SEM-EDS) The surface morphology of uninhibited aluminium composite (see Figure 3) shown severe pits, cracks and selective dissolution of intermetallic occurred at the surface as compared with Figure 4 indicating that there was an improvement in the surface morphology of composite that was treated with the inhibitor, which correspond to the lower corrosion rate obtained from the linear polarization analysis. The microstructure of the inhibited do not revealed severe pits and cracks. © 2013 University of Manchester and the authors. This is a preprint8of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN 1466-8858 Volume 16, Preprint 36 submitted 17 May 2013 Fig. 3. SEM micrograph rograph of uninhibited Al-Si/SiC Al in 3.65% NaCl solution after 288 h of exposure at different magnifications. magnifications Fig. 4. SEM micrograph rograph of inhibited Al-Si/SiC in 3.65% NaCl -0.5 0.5 g/v KI after 288 h of exposureat different magnifications. magnifications 3.2.4 Inhibitor efficiency and adsorption behaviour The percentage inhibitor efficiency efficie (% IE) of the Al-Si/SiC in NaCl solution was done using the equation reported [16]. The variation in the % IE using gravimetric (GM), potentiodynamic polarization-corrosion polarization rate (PP-CR), CR), potentiodynamic polarizationpolarization corrosion density (PP-Icorr), and linear polarization resistance (LPR) are presented in Figure 5. The results show that addition tion of KI increased the IE with an increase in the inhibitor concentrations. This is due to the fact that, as the KI addition increases, the surface area © 2013 University of Manchester and the authors. This is a preprint9of a paper that has been submitted for publication in the Journal of Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSNcovered 1466-8858 by Volume 16, Preprint submittedcan 17 May this inhibitor increased hence higher IE was36achieved. KI as an inhibitor be 2013 said to exhibit a mixed-type corrosion inhibition because of the simultaneous change in the anodic and cathodic region during the electrochemical study. Equally, there exist correlations between GM and potentiodynamic polarization resistance. The adsorption mechanism has been demonstrated with a relationship between C/θ against C that indicated linearity at 298K in the environment (see Figure 6). Since the correction factors (R2) were calculated and close to unity: GM (0.9049) and LPR (0.9979), a Langmuir adsorption isotherm is believed to have been obeyed. 120 100 IE (%) 80 GM 60 PP-CR PP-Icorr 40 LPR 20 0 0.5 1 1.5 2 C (g/v) Fig. 5: Comparative chart of inhibitor efficiency (IE) for 3.65% NaCl solution/KI concentration obtained by gravimetric (GM), potentiodynamic polarization-corrosion rate (PP-CR), potentiodynamic polarization-corrosion current (PP-Icorr) and linear polarization resistance (LPR). 10of a paper that has been submitted for publication in the Journal of © 2013 University of Manchester and the authors. This is a preprint Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN 1466-8858 4 Volume 16, Preprint 36 3.5 y = 1.824x - 0.64 R² = 0.9049 (GM) 3 2.5 C/θ submitted 17 May 2013 y = 1.06x - 0.05 R² = 0.9979 (LPR) 2 GM LPR 1.5 Linear (GM) 1 Linear (LPR) 0.5 0 0 0.5 1 1.5 2 2.5 C (g/v) Fig. 6. Langmuir isotherm for the adsorption of KI compounds on the aluminium composite surface in 3.65% NaCl solution obtained by gravimetric and potentiodynamic polarization methods at 298K. 4. Conclusions From the results and discussion above the following conclusions are made: i. KI have been proved to be a good corrosion inhibitor in Al-Si/SiC in NaCl environment at 25oC ii. The corrosion resistance and inhibitor efficiency of Al-Si/SiC composite increased with addition of KI as inhibitor with Inhibitor efficiency as high as 97.57% using the gravimetric method of corrosion evaluation. iii. Surface morphology of uninhibited aluminium composite sample shows severe pits and cracks. iv. A mixed-type corrosion inhibition exist and Langmuir adsorption isotherms were proposed for the aluminium composite in the environment considered. 11of a paper that has been submitted for publication in the Journal of © 2013 University of Manchester and the authors. This is a preprint Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSNAcknowledgements 1466-8858 Volume 16, Preprint 36 submitted 17 May 2013 The authors wish to acknowledge the Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Pretoria for providing the equipment used for the electrochemical corrosion test. References [1] I. Grigorios, K.R.Pradeep, M. Angeliki, V. Charalampos, D.D. John, K. Nikolaos, Pressure infiltration technique for the synthesis of A356 Al/fly ash composites: Microstructure and tribological performance. Word of Coal Ash (WOCA) conference-May 9-12, 2011, Denvere, Co, USA, 2011. [2] S.A. Sajjadi, P.M.Torabi, H.R. Ezatpour, A.Sedghi, Fabrication of A356 composite reinforced with micro and nano Al2O3 particles by a developed compo-casting method and study of its properties, Journal of Alloys and Compounds, 511 (2012) 226– 231. [3] M. Ali, O.S.Mohsen, Mechanical Properties of Squeeze-Cast A356 Composites Reinforced with B4C Particulates, Journal of Materials Engineering and Performance,21(2) (2012) 247–252. [4] G.E. Mangin, J.A.Isasscs, J.P.Clark, J. Met., 48(2) (1996) 49-51. [5] Y.L. Saraswathi, S.Das, D.P. Mondal, A comparative study of the Corrosion Behavior of Al-SiCp Composite with cast iron, Corrosion, 57(7) (2001) 643-653. [6] M.Ramachandra, K.Radhakrishna, J. Mater. Sci. Poland., 24 (2006) 334-349. [7] J. Zhahaviand H.J. Wagner, K. Natesan, (ed.), Proc. Symp., Fall meeting of Metals society of AIME, St Louis, Missouri, American Institute of Mining, Metallurgical, and Petroleum Engineers, Warrendale, PA, pp: 226, 1978. [8] M.Aylor, P.J.Morgan, Effect of reinforcement on the pitting behaviour of aluminium based metal matrix composite, J. Electrochem. Soc., 132 (1985) 1277. [9] C.K. Fang, C.C. Huang, J. Chuang, Metallurgy and Materials Transactions, 30A (1999). [10] M. Metikos-Hukovic, R. Basic, Z. Grubac, The study of aluminium corrosion in acidic solution with nontoxic inhibitors. J. Appl. Electrochem. 32 (2002) 35-41. [11] F. Asuke, S.A.Yaro, O.B. Oloche, Evaluation of Palm exudate (Palm Wine) as Corrosion Inhibitor for Al-5%Si/15%SiC Composite in Caustic Soda Solution, Journal of Applied Sciences Research, 6(11) (2010) 1759-1765. 12of a paper that has been submitted for publication in the Journal of © 2013 University of Manchester and the authors. This is a preprint Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work. ISSN[12] 1466-8858 G. Sha, 16, G. Preprint 36 submitted 17 May 2013 H. Moller, W.E. Stumpt,Volume J.H. Xia, Govender, S.P. Ringer, Solute nanostructures and their strengthening effects in Al-7Si-0.6Mg alloy F357. Acta Materialia 60, (2012) 692. [13] D.B. Hmamou, R. Salghi, A. Zarrouk, B. Hammouti, S.S. Al-Deyab, Bazzi, Lh., H. Zarrok, A. Chakir, L. Bammou, Int. J. Electrochem. Sci. 7, (2012) 2361. [14] O.K. Abiola, J.O.E. Otaigbe, O.J. Kio, Gossipium hirsutum L. extract as green corrosion inhibitor for aluminium in NaCl solution. Corrosion Science 51, (2009) 1879. [15] A.M.Al-Turkustani, S.T. Arab, L.S.S.Al-Qarni, Oriental Journal of Chemistry, 26(2)(2010) 437. [16] J.Halambek, K. Berkovic,J.Vorkapic-Furac, The influence of Lavandula angustifolia L. oil on corrosion of Al-3Mg alloy, Corrosion Science, 52 (2010) 3978-3983. 13of a paper that has been submitted for publication in the Journal of © 2013 University of Manchester and the authors. This is a preprint Corrosion Science and Engineering. It will be reviewed and, subject to the reviewers’ comments, be published online at http://www.jcse.org in due course. Until such time as it has been fully published it should not normally be referenced in published work.