Improvement of adhesive bonding of grit-blasted steel substrates by using diluted resin as a primer |
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| Affiliation: | 1. Key Laboratory of Road Construction Technology and Equipment, MOE, Chang''an University, Xi''an 710064, PR China;2. School of Mechanical and Chemical Engineering, University of Western Australia, Perth, WA 6009, Australia;1. Research Center for Pharmaceutical Nanotechnology (RCPN), Tabriz University of Medical Science, Tabriz, Iran;2. Department of Materials Engineering, Institute of Mechanical Engineering, University of Tabriz, Tabriz 51666-16444, Iran;3. Faculty of Mechanical Engineering, Urmia University of Technology, Urmia, Iran;4. School of Mechanical Engineering, Tehran University, P.O.B. 14395515 Tehran, Iran;1. School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Fabrication & Joining Section, Universiti Kuala Lumpur Malaysia France Institute, Section 14, Jalan Teras Jernang, 43650 Bandar Baru Bangi, Selangor, Malaysia;3. Faculty of Science & Technology, Universiti Sains Islam Malaysia, 71800 Bandar Baru Nilai, Negeri Sembilan, Malaysia;1. Lublin University of Technology, Faculty of Mechanical Engineering, Department of Production Engineering, 36 Nadbystrzycka Str., 20-618 Lublin, Poland;2. Technical University of Dresden, Institute of Lightweight Engineering and Polymer Technology (ILK), Holbeinstr. 3, 01307 Dresden, Germany;3. Department of Material Science and Manufacturing Technology, Faculty of Engineering Czech University of Life Sciences, Kamycka 129, Praha − 6, Suchdol 165 21, Czech Republic;1. SymbiosisInstitute of Technology (SIT), Symbiosis International University (SIU), Lavale, Pune 412115, Maharashtra state, India;2. CEFET/RJ, Federal Center ofTechnologicalEducation, Av-Maracanã, 229, 20271- 110, Rio de Janeiro/RJ, Brazil;1. Department of Environmental and Chemical Engineering, University of Calabria, Italy;2. Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, Italy;3. Department of Mechanical, Energy and Management Engineering, University of Calabria, Italy |
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| Abstract: | This study reveals the micro-structural details on the metal substrate surface prepared by grit blasting, and then proposes a simple resin pre-coating method aiming at full wetting of the substrate surface for stronger adhesive bonding. The resin pre-coating solution consisting of around 90% acetone and around 10% resin without hardener is used as a primer, which can be sprayed or blushed onto the grit-blasted metal substrate. The acetone solution can carry resin deep into micro-cavities created by grit blasting and effectively coat and wet micro-debris so that micro-voids or gaps between the adhesive joint and metal substrate can be removed. Since the resin pre-coating does not contain hardener and remains wet, the wettability of the substrate is also improved. The normal epoxy adhesive with hardener can then be applied onto the substrate surface. Despite having the primer-like function, the proposed resin pre-coating method still maintains the simplicity of one epoxy resin system. Based on the current study, a resin and acetone solution without hardener does not seem to have adverse effects on the final bonding strengths of adhesive joints, although acetone is known to have detrimental effects on resin and hardener adhesive systems. Four different surface conditions are examined, each having 14 specimens: (1) Grit-Blasted (GB) surface, (2) GB-surface with ultrasonic cleaning, (3) GB-surface with resin Pre-Coating (PC) only, and (4) GB-surface with both ultrasonic cleaning and PC. 25% improvement in the shear strength has been achieved by the resin pre-coating method, even without ultrasonic cleaning, in comparison with 8% improvement after ultrasonic cleaning. These results show GB-surface with PC is beneficial to adhesive bonding, which can be adopted for structural applications even if thorough substrate surface cleaning on site is not possible. The improved wettability of metal substrates after resin pre-coating contributes to the maximum possible utilization of the contact areas over the roughened substrate surfaces and thus leads to the enhanced adhesive bond strength. |
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| Keywords: | Epoxy adhesive Steel substrate Shear strength Grit-blasting Ultrasonic-cleaning Resin pre-coating |
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