New Adhesive Bonding Surface Treatment Technologies for Lightweight Aluminum-Polypropylene Hybrid Joints in Semi-Structural Applications

Gallant, Danick; Savard, Véronique

doi:10.4271/2011-01-0217

Cited by 7 publications

(3 citation statements)

References 17 publications

(16 reference statements)

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“…An overview of the surface free energy concept has been provided by Gallant and Savard [8] in the context of adhesive bonding. Another criterion that plays an important role in achieving good adhesive bond strength is that the surface must exhibit a maximum surface area in order to be able to mechanically interlock the adhesive, which is achieved by surface roughening techniques.…”

Section: Introductionmentioning

confidence: 99%

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Noormohammed

Sarkar

Paynter

et al. 2012

Applied Surface Science

136

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Structural adhesive bonding of aluminum is widely used in aircraft and automotive industries. It has been widely noted that surface preparation of aluminum surfaces prior to adhesive bonding plays a significant role in improving the strength of the adhesive bond. Surface cleanliness, surface roughness, surface wettability and surface chemistry are controlled primarily by proper surface treatment methods. In this study, we have employed a very simple technique influencing all these criteria by simply immersing aluminum substrates in a very dilute solution of sodium hydroxide (NaOH) and we have studied the effect of varying the treatment period on the adhesive bonding characteristics. A bi-component epoxy adhesive was used to join the treated surfaces and the bond strengths were evaluated via single lap shear (SLS) tests in pristine as well as degraded conditions. Surface morphology, chemistry, crystalline nature and wettability of the NaOH treated surfaces were characterized using various surface analytical tools such as scanning electron microscopy and energy dispersive X-ray analysis (SEM/EDX), optical profilometry, infrared reflection absorption spectroscopy, Xray photoelectron spectroscopy, X-ray diffraction and contact angle goniometry.Excellent adhesion characteristics with complete cohesive failure of the adhesive were encountered on the NaOH treated surfaces that are comparable to the benchmark treatments such as anodization, which involve use of strong acids and multiple steps of treatment procedures. The NaOH treatment reported in this work is a very simple method with the use of a very dilute solution with simple ultrasonication being sufficient to produce durable joints. Graphical AbstractHighlights A very simple surface treatment method to achieve excellent and durable aluminum adhesive bonding. Our method involves simple immersion of aluminum in very dilute NaOH solution at room temperature with no involvement of strong acids or multiple procedures. Surface analysis via various surface characterization techniques showed morphological and chemical modifications favorable for obtaining highly durable bond strengths on the treated surface. Safe, economical, reproducible and simple method, easily applicable in industries.

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Section: Introductionmentioning

confidence: 99%

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Noormohammed

Sarkar

Paynter

et al. 2012

Applied Surface Science

136

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show abstract

“…It was reported that the shear strength ranged from 1.6 MPa to 7.4 MPa, most of which has a shear strength less than 5 MPa. 28 After using a multiple-step treatment, including acetone rinse with oven dry, plasma treatment, methanol rinse and with oven dry, the shear strength in one of the bonding scenarios reached 11 MPa while the bonding strengths for the other cases ranged from 4.7 MPa to 9.4 MPa with large standard deviations.…”

Section: Introductionmentioning

confidence: 94%

“…The bonding between aluminum and PP or its matrix composite has been reported to be minimal without any treatment. 28 Gallant and Véronique 28 have performed an adhesion study between aluminum and PP by plasma treating the surface. Plasma treatment was applied on the surface of the PP, and aluminum plate is degreased, abraded, and primed before different adhesives, such as epoxy, urethane, and methacrylate, were used to bond the aluminum and the PP.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of a polypropylene matrix composite and aluminum hybrid material

Yeole

Ning

Hassen

2019

Journal of Thermoplastic Composite Materials

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Hybridizing different materials, such as metals and polymer matrix composites, has recently drawn attention as it can produce a unique material that offers advantages from both the metals and the composites. However, the strict surface preparation required, a relatively low production rate, and the resultant weak interface have been the hurdles for this technology. The low surface energy of some polymeric materials, such as polypropylene (PP) and their composites, has posed even more challenges when bonding with metals. This work aims to develop a hybridized PP matrix composite and aluminum with through thickness reinforcements (TTRs) at a high production rate and with minimal treatment. Long glass fiber PP matrix composite (LFT glass/PP) is integrated with aluminum sheet using an extrusion–compression molding process at a rate of 2 minutes per plate. The bonding between these two materials is achieved using the TTRs on the aluminum sheet that provide mechanical locking at the interface. The hybridized aluminum and glass/PP LFT material is evaluated on its performance in lap shear, short beam shear, flexure, and tension. It is concluded that the mechanical locking at the interface provides a lap shear bonding strength of 6.8 MPa, and the hybridized material has significantly improved tensile and flexural modulus as well as strength compared to the glass/PP LFT only. The same approach can be readily extended to hybridizing other polymer matrix composites with metallic materials.

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Rudawska¹

2019

Surface Treatment in Bonding Technology

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New Adhesive Bonding Surface Treatment Technologies for Lightweight Aluminum-Polypropylene Hybrid Joints in Semi-Structural Applications

Cited by 7 publications

References 17 publications

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Development and characterization of a polypropylene matrix composite and aluminum hybrid material

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