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Cold Plasma Pretreatment of Carbon Fibre Composite Substrates to Improve Adhesive Bonding Performance

DOI: 10.1155/2014/325729

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The purpose of the paper is to investigate the effects of low pressure plasma treatment on wettability of carbon fibre reinforced polymer samples and on shear properties of adhesive bonded joints based on these substrates. In particular, two plasma process parameters, exposure time and power input, were optimized, performing contact angle evaluation on lap-shear tests. The plasma treatment was also compared with a conventional mechanical abrasion and untreated and only degreased specimens. The experimental results show that choosing the optimal parameters is possible to improve the wettability of composite substrates and reduce the contact angle. 1. Introduction The use of composites is a growing reality in many industrial fields, from civil structures [1–3] to transport industry and especially in aeronautics components [4–9]. Some of their advantages are stiffness, ability to be tailored into complex shapes, strength, corrosion resistance, fatigue properties, and lightweight. In particular, the possibility to decrease the final weight of a manufactured structural component is essential in terms of fuel consumption reduction [10, 11]. Composites are primarily integrated in structures by means of mechanical fastening or adhesive bonding. Adhesives have many advantages in joining composite materials. Perhaps the most significant is that adhesive bonding does not require the composite to be drilled or machined. In fact, traditional techniques of mechanical fastening require the presence of metallic inserts for entering screws and rivets, which makes the manufacturing of the components more complex and does not allow modifications during construction. The use of bonding techniques also allows a better stress distribution as well as durable, lightweight, and aesthetic joints [12, 13]. One of the most important processes to be set before realizing polymer based composite adhesive bonding is the pretreatment of the surface, due to the low surface energy showed by polymers. Recommended preparations of many composite adherends simply consist of a solvent wipe in order to remove dirt and oil followed by a mechanical abrading operation [12–15]. Another widely used technique to solve the problem of composite pretreatment is the peel ply [16]. Many studies have been performed on the preparation of composite substrates also using nonconventional techniques, such as laser [17, 18] or plasma treatments [19–23]. In particular, the aim of a plasma treatment, which can be considered as a physical-chemical procedure, is the functionalization of the specimen surfaces in


[1]  P. Colombi, G. Fava, and C. Poggi, “End debonding of CFRP wraps and strips for the strengthening of concrete structures,” Composite Structures, vol. 111, no. 1, pp. 510–521, 2014.
[2]  A. M. López-Buendía, M. D. Romero-Sánchez, V. Climent, and C. Guillem, “Surface treated polypropylene (PP) fibres for reinforced concrete,” Cement and Concrete Research, vol. 54, pp. 29–35, 2013.
[3]  S. K. Ha, S. Na, and H. K. Lee, “Bond characteristics of sprayed FRP composites bonded to concrete substrate considering various concrete surface conditions,” Composite Structures, vol. 100, pp. 270–279, 2013.
[4]  C. Garnier, M.-L. Pastor, F. Eyma, and B. Lorrain, “The detection of aeronautical defects in situ on composite structures using non destructive testing,” Composite Structures, vol. 93, no. 5, pp. 1328–1336, 2011.
[5]  Y. He, G. Tian, M. Pan, and D. Chen, “Non-destructive testing of low-energy impact in CFRP laminates and interior defects in honeycomb sandwich using scanning pulsed eddy current,” Composites Part B: Engineering, vol. 59, pp. 196–203, 2014.
[6]  A. Castellano, P. Foti, A. Fraddosio, S. Marzano, and M. D. Piccioni, “Mechanical characterization of CFRP composites by ultrasonic immersion tests: experimental and numerical approaches,” Composites B: Engineering, vol. 66, pp. 299–310, 2014.
[7]  A. Al-Shawaf, “Modelling wet lay-up CFRPsteel bond failures at extreme temperatures using stress-based approach,” International Journal of Adhesion and Adhesives, vol. 31, no. 6, pp. 416–428, 2011.
[8]  R. Sturm, Y. Klett, C. Kindervater, and H. Voggenreiter, “Failure of CFRP airframe sandwich panels under crash-relevant loading conditions,” Composite Structures, vol. 112, no. 1, pp. 11–21, 2014.
[9]  M. S. Found, J. R. Lamb, P. Moore, and M. W. Jones, “Comparison of damage resistance of CFRP lightweight panels,” Composites Part A, vol. 36, no. 2, pp. 197–203, 2005.
[10]  N. Encinas, B. R. Oakley, M. A. Belcher et al., “Surface modification of aircraft used composites for adhesive bonding,” International Journal of Adhesion and Adhesives, vol. 50, pp. 157–163, 2014.
[11]  K. Zhang, Z. Yang, and Y. Li, “A method for predicting the curing residual stress for CFRP/Al adhesive single-lap joints,” International Journal of Adhesion and Adhesives, vol. 46, pp. 7–13, 2013.
[12]  E. M. Petrie, Handbook of Adhesives and Sealants, McGraw-Hill, New York, NY, USA, 2000.
[13]  A. Baldan, “Adhesively-bonded joints and repairs in metallic alloys, polymers and composite materials: adhesives, adhesion theories and surface pretreatment,” Journal of Materials Science, vol. 39, no. 1, pp. 1–49, 2004.
[14]  R. F. Wegman and J. van Twisk, Surface Preparation Techniques for Adhesive Bonding, Elsevier, London, UK, 2013.
[15]  ASTM D2093-03, “Standard Practice for Preparation of Surfaces of Plastics Prior to Adhesive Bonding,” 2003.
[16]  M. Kanerva and O. Saarela, “The peel ply surface treatment for adhesive bonding of composites: a review,” International Journal of Adhesion & Adhesives, vol. 43, pp. 60–69, 2013.
[17]  Q. Bénard, M. Fois, M. Grisel, and P. Laurens, “Surface treatment of carbon/epoxy and glass/epoxy composites with an excimer laser beam,” International Journal of Adhesion and Adhesives, vol. 26, no. 7, pp. 543–549, 2006.
[18]  M. Rotel, J. Zahavi, S. Tamir, A. Buchman, and H. Dodiuk, “Pre-bonding technology based on excimer laser surface treatment,” Applied Surface Science, vol. 154-155, pp. 610–616, 2000.
[19]  M. E. R. Shanahan and C. Bourgès-Monnier, “Effects of plasma treatment on the adhesion of an epoxy composite,” International Journal of Adhesion and Adhesives, vol. 16, no. 2, pp. 129–135, 1996.
[20]  T. S. Williams, H. Yu, P.-C. Yeh, J.-M. Yang, and R. F. Hicks, “Atmospheric pressure plasma effects on the adhesive bonding properties of stainless steel and epoxy composites,” Journal of Composite Materials, vol. 48, no. 2, pp. 219–233, 2014.
[21]  M. R. Gude, S. G. Prolongo, and A. Ure?a, “Adhesive bonding of carbon fibre/epoxy laminates: correlation between surface and mechanical properties,” Surface and Coatings Technology, vol. 207, pp. 602–607, 2012.
[22]  M. O. H. Cioffi, H. J. C. Voorwald, L. R. O. Hein, and L. Ambrosio, “Effect of cold plasma treatment on mechanical properties of PET/PMMA composites,” Composites Part A: Applied Science and Manufacturing, vol. 36, no. 5, pp. 615–623, 2005.
[23]  N. Anagreh, L. Dorn, and C. Bilke-Krause, “Low-pressure plasma pretreatment of polyphenylene sulfide (PPS) surfaces for adhesive bonding,” International Journal of Adhesion & Adhesives, vol. 28, no. 1-2, pp. 16–22, 2008.
[24]  C. Tendero, C. Tixier, P. Tristant, J. Desmaison, and P. Leprince, “Atmospheric pressure plasmas: a review,” Spectrochimica Acta B: Atomic Spectroscopy, vol. 61, no. 1, pp. 2–30, 2006.
[25]  W. Petasch, E. R?uchle, M. Walker, and P. Elsner, “Improvement of the adhesion of low-energy polymers by a short-time plasma treatment,” Surface and Coatings Technology, vol. 74-75, no. 2, pp. 682–688, 1995.
[26]  V. Fombuena, J. Balart, T. Boronat, L. Sánchez-Nácher, and D. Garcia-Sanoguera, “Improving mechanical performance of thermoplastic adhesion joints by atmospheric plasma,” Materials and Design, vol. 47, pp. 49–56, 2013.
[27]  I. De Iorio, C. Leone, L. Nele, and V. Tagliaferri, “Plasma treatments of polymeric materials and Al alloy for adhesive bonding,” Journal of Materials Processing Technology, vol. 68, no. 2, pp. 179–183, 1997.
[28]  H. M. S. Iqbal, S. Bhowmik, and R. Benedictus, “Surface modification of high performance polymers by atmospheric pressure plasma and failure mechanism of adhesive bonded joints,” International Journal of Adhesion and Adhesives, vol. 30, no. 6, pp. 418–424, 2010.
[29]  C. Mandolfino, E. Lertora, C. Gambaro, and M. Bruno, “Improving adhesion performance of polyethylene surfaces by cold plasma treatment,” Meccanica, vol. 49, no. 10, pp. 2299–2306, 2014.
[30]  C. Mühlhan, S. Weidner, J. Friedrich, and H. Nowack, “Improvement of bonding properties of polypropylene by low-pressure plasma treatment,” Surface and Coatings Technology, vol. 116–119, pp. 783–787, 1999.
[31]  U. Schulz, P. Munzert, and N. Kaiser, “Surface modification of PMMA by DC glow discharge and microwave plasma treatment for the improvement of coating adhesion,” Surface and Coatings Technology, vol. 142–144, pp. 507–511, 2001.
[32]  N. Saleema and D. Gallant, “Atmospheric pressure plasma oxidation of AA6061-T6 aluminum alloy surface for strong and durable adhesive bonding applications,” Applied Surface Science, vol. 282, pp. 98–104, 2013.
[34]  L. Carrino, G. Moroni, and W. Polini, “Cold plasma treatment of polypropylene surface: a study on wettability and adhesion,” Journal of Materials Processing Technology, vol. 121, no. 2-3, pp. 373–382, 2002.
[35]  J. K. Park, W. T. Ju, K. H. Paek et al., “Pre-treatments of polymers by atmospheric pressure ejected plasma for adhesion improvement,” Surface and Coatings Technology, vol. 174-175, pp. 547–552, 2003.
[36]  ASTM, “Standard test method for lap shear adhesion for Fiber Reinforced Plastic (FRP) bonding,” ASTM D5868-01, ASTM International, 2014.
[37]  C. J. Lee, S. K. Lee, D. C. Ko, D. J. Kim, and B. M. Kim, “Evaluation of surface and bonding properties of cold rolled steel sheet pretreated by Ar/O2 atmospheric pressure plasma at room temperature,” Journal of Materials Processing Technology, vol. 209, no. 10, pp. 4769–4775, 2009.
[38]  N. Encinas, J. Abenojar, and M. A. Martínez, “Development of improved polypropylene adhesive bonding by abrasion and atmospheric plasma surface modifications,” International Journal of Adhesion and Adhesives, vol. 33, pp. 1–6, 2012.
[39]  N. Saleema, D. K. Sarkar, R. W. Paynter, D. Gallant, and M. Eskandarian, “A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications,” Applied Surface Science, vol. 261, pp. 742–748, 2012.


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