Initial investigation into the effectiveness of CO2-laser treatment of aluminium for adhesive bonding

Critchlow, Gary W.; Brewis, D.M.; Emmony, D. C.; Cottam, C. A.

doi:10.1016/0143-7496(96)83704-3

Cited by 37 publications

(11 citation statements)

References 6 publications

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“…Die Vorbehandlung der Aluminiumblechen mit umweltfreundlichen Verfahren wie Trockeneisstrahlen [1], kathodische Lichtbogenentladung [2,3], Excimerlaser [4], CO 2 -Laser [5,6] und Cryoblasting [7] bewirken Haftungssteigerungen gegenüber dem Anlieferungszustand, wobei Haftfestigkeiten zumeist in der Größenordnung des Vorbehandelns mit umweltbelastender chemischer oder elektrochemischer Verfahren erzielt werden [8]. Auch weitgehend ähnliche Klebfestigkeiten wurden beim staubauslösenden und zeitaufwendigen Druckluftstrahlen mit Korund oder Duroplast ermittelt [9,10].…”

Section: Stand Der Erkenntnisseunclassified

“…Demzufolge ist bei Epoxidklebstoffen die Vorbehandlung der Al-Bleche durch Strahlen nicht optimal, weil die Grenzschicht zwischen Klebstoffschicht und Al-Oberfläche eine Schwachstelle darstellt. Daher hängen die Klebfestigkeiten stark von den mechanischen Eigenschaften der Klebstoffe und Fügeteile sowie von der Abstimmung der Klebstoffzusamensetzung auf die Al-Oberflächen ab [5,6,8,9,10]. Darüber hinaus zeigen sowohl umweltfreundliche als auch umweltbelastende Verfahren ähnliches Langzeit-und Bruchverhalten.…”

Section: Stand Der Erkenntnisseunclassified

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Klebflächenvorbehandlung von Aluminiumoberflächen mit Haftvermittler

Anagreh

Dorn

2003

Materialwissenschaft Werkst

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Der Einfluss dreistufiger Vorbehandlung Entfetten, Strahlen und Primer und zweistufiger Vorbehandlung Entfetten und Strahlen auf das Klebverhalten von Aluminiumlegierung AlMg4,5Mn0,5 wurde ermittelt. Die Untersuchungen wurden mit zwei kaltaushärtenden Zweikomponenten-Epoxidklebstoffen, einem warmaushärtenden Einkompnenten-Epoxidklebstoff und einem kaltaushärtenden Zweikomponenten-Polyurethanklebstoff durchgeführt. Die dreistufige Vorbehandlung wies bei Epoxidklebstoffen höhere Klebfestigkeitswerte auf als bei zweistufiger, beim PU-Klebstoff unterscheiden sich dagegen die ermittelten Klebfestigkeitswerten kaum voneinander. Das Weglassen des Arbeitsschritts Entfetten nach dem Korundstrahlen, der zur Beseitigung von Strahlmittelrückständen führt, bewirkt bei PU-, EP 2-und EP 3-Klebstoff eine merkliche Reduzierung der Klebfestigkeiten gegenüber entfetteten Proben. Die Primervorbehandlung führt wegen erhöhter Viskosität zur Ü berdeckung der topographischen Strukturen von gestrahlten Aluminiumoberflächen, was eine starke Abnahme der Oberflächenrauheiten bewirkt. Es trat auch eine starke Veränderung der chemischen Zusammensetzung gegenüber nur entfetteten bzw. gestrahlten Oberflächen ein.Schlagworte: Klebfestigkeit, Strahlen (Korund, Duroplast), Aluminium, Klebstoffe (Epoxid, Polyurethan), HaftvermittlerThe influence of three steps pretreatment degreasing, blasting and primer and the two steps pretreatment degreasing and blasting on the adhesive behaviour of aluminum alloy AlMg4,5Mn0,5 were investigated. The investigations were preformed using two cold hardening two-components epoxy adhesives, one hot hardening one-component epoxy adhesive and one cold hardening two-components polyurethane adhesive. The three steps pretreatment indicate that the adhesion bonding strength by epoxy adhesives are higher than that by two steps pretreatment. On the other hand, the adhesion bonding strength was similar by using polyurethane adhesive independence of the pretreatment method. Leaving out the pretreatment step degreasing after corund blasting caused by using, PU, EP 2 and EP 3 adhesives a significant decreasing of the bonding strength in comparison with the only degreased specimen. This degreasing process was used to remove the residual blasting medium from the aluminum surfaces after blasting. The topographical structure of the surfaces after corund blasting was covered by further pretreatment with primer as a consequence of higher primer viscosity, which causes a decreasing in the surface roughness. The chemical composition of pretreated surfaces by three steps was different from that by two steps.

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Section: Stand Der Erkenntnisseunclassified

Klebflächenvorbehandlung von Aluminiumoberflächen mit Haftvermittler

Anagreh

Dorn

2003

Materialwissenschaft Werkst

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“…[12][13][14][15] Some studies show that laser pretreatment of aluminum surfaces can modify the natural oxide layer. [12][13][14][15] Some studies show that laser pretreatment of aluminum surfaces can modify the natural oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the aluminum oxide properties for adhesive bonding by laser surface pretreatment

Rechner

Jansen

Beyer

2012

Journal of Laser Applications

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The laser pretreatment of AlMg3 has been conducted to investigate the influence of the fluence on the oxide properties. Therefore, the aluminum surface is pretreated by a fiber laser and subsequently analyzed by SEM, EDX, and XPS. Finally, mechanical measurements are performed on adhesively bonded specimens to study the surface properties produced. For the purpose of comparison, the two state-of-the-art pretreatment methods etching and phosphoric acid anodizing are also investigated. The results show that laser pretreatment changes the properties of the aluminum surface and especially those of the oxide layer. The latter grows in comparison to the natural oxide layer of etched surfaces but does not reach the dimensions of an electrochemically formed oxide layer. Mechanical testing showed that the laser treated specimens reach and exceed the strength values of etched and anodized surfaces, respectively. However, strength after aging does not keep up with the good long-term resistance of anodized aluminum, but it exceeds by far the values obtained for etched surfaces. Overall the study showed that optimizing the oxide layer by laser pretreatment leads to improved adhesion and enhances the strength of adhesively bonded aluminum. Therefore, the laser pretreatment of aluminum is an excellent alternative to wet (electro)chemical processes

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“…알루미늄 소재의 접착강도 향상을 위한 연구로는 eximer laser 1) , CO2 laser [2][3] 아크열처리 , 4) 그리고 cyroblasting 5) 에 연구들이 진행되었다 알루미늄 표면에 연 . 마분사 가공시 상당한 양의 접착강도(adhesive 가 향상 되었다 strength) 6 …”

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Optimal Blasting Conditions for Surface Profile when Micro Particle Blasting by Statistical Analysis of Orthogonal Arrays

Kwon¹,

Wang²

2016

Journal of the Korean Society of Manufacturing Process Engineer

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A study on the micro particle blasting was conducted to find the optimum conditions of the blasted surface of aluminum 6061. The particle type such as Al2O3 and SiC, nozzle diameter, pressure, standoff distance and injection time were used as blasting conditions. Statistical method of orthogonal arrays(ANOVA) was used to find optimum conditions of maximum depth and maximum diameter of blasted surface. Particle type, nozzle diameter, and pressure were found to be the main factors of maximum blasted depth and diameter. Maximum blasted diameter was affected by increasing pressure and nozzle diameter but saturated maximum diameter. Maximum blasted depth was affected by pressure and nozzle diameter when aluminum 6061 was blasted with Al2O3 particle. The value of surface roughness was increased as pressure and nozzle diameter increased when aluminum 6061 was blasted with SiC

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Initial investigation into the effectiveness of CO2-laser treatment of aluminium for adhesive bonding

Cited by 37 publications

References 6 publications

Klebflächenvorbehandlung von Aluminiumoberflächen mit Haftvermittler

Klebflächenvorbehandlung von Aluminiumoberflächen mit Haftvermittler

Optimization of the aluminum oxide properties for adhesive bonding by laser surface pretreatment

Optimal Blasting Conditions for Surface Profile when Micro Particle Blasting by Statistical Analysis of Orthogonal Arrays

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