Effects of surface treatment of aluminium alloy 1050 on the adhesion and anticorrosion properties of the epoxy coating

Golru, Samaneh Sharifi; Attar, M.M.; Ramezanzadeh, Bahram

doi:10.1016/j.apsusc.2015.03.148

Cited by 91 publications

(47 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3b-d. Paint coatings have a non-directional surface finish as reported in the literature [2,15,19]. Coating 2.1 exhibits a smoother surface and its roughness is lower than that of aluminum substrate.…”

Section: Roughness and Topographymentioning

confidence: 77%

“…The adhesion of coating to substrate depends on factors such as the adhesive force between the surface layer of a component and a coating, metal surface wettability, free energy, surface roughness and the presence of polar groups [9,19,20]. Moreover, sophisticated methods like ozone treatment can be applied to increase adhesion bonding between polymer material and various metal substrates [10,11].…”

Section: Adhesion and Mechanical Testingmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

Szala¹,

Kot²

2017

Adv. Sci. Technol. Res. J.

View full text Add to dashboard Cite

The literature does not provide a systematic analysis of the effect of electrostatic powder coating repainting of structural and constructional aluminum elements on their technological parameters. It is industrial practice that worn or damaged coatings be repainted. It is crucial to determine the effect of electrostatic sprayed coatings repainting on their microstructure, roughness and mechanical properties. The aim of the work is to determinate the influence of repainting of powder deposited polyester coatings on their mechanical properties, roughness and microstructure. This study examined three different electrostatic spray epoxy coatings with matt, silk gloss and fine structure-matt finish. Test panels were prepared as single-and double-layer paint coatings on the aluminum alloy 6060 substrate. Hence, six test sets of coatings were deposited. Each set contained six samples. The microstructure of the cross section of coating was investigated by scanning electron microscopy (SEM) and light optical microscopy (metallographic and stereoscopy microscope). The chemical composition of coating was analyzed by the SEM-EDS method. The 2D surface roughness of single-and double-layer coatings and 3D surface topography maps were examined using a profile measurement gauge. The mechanical properties of coatings were measured by cupping, bending, impact, adhesion to substrate tests run according to standard procedures. As a result, the influence of repainting of polyester powder coatings on their properties was determined. The results demonstrate that repainting has no effect on the microstructure and coating adhesion to substrate as well as the bending test results and roughness of matt and silk gloss coatings. It has been found that repainting affects the results of impact and cupping tests as well as the roughness of samples with fine structure surface finish.

show abstract

Section: Roughness and Topographymentioning

confidence: 77%

Section: Adhesion and Mechanical Testingmentioning

confidence: 99%

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

Szala¹,

Kot²

2017

Adv. Sci. Technol. Res. J.

View full text Add to dashboard Cite

show abstract

“…This observation is reinforced by the findings of Golrua et al who concluded that the adhesion strengths of the coatings applied on Zr-treated aluminium samples were greater than those of untreated samples. 23 However, after an exposure of 100 h, the conversion-coated specimen without a top lacquer coating failed and the examination revealed cracked corrosion products on the aluminium substrate. The conversion coating without a lacquer barrier was compromised after a relatively lengthy period in a high-humidity cabinet.…”

Section: Performance Of Zirconium Conversion Coating In a 100-% Humidmentioning

confidence: 99%

Electron-optical and Auger electron spectroscopy studies of a zirconium conversion coating on aluminium

Adediran¹,

Oki²,

Akintola³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

The techniques of scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultramicrotomy and energy dispersive X-ray analysis (EDX) were employed to examine conversion coatings on aluminium developed from a zirconium nitrate/fluoride solution. The coating developed slowly on a microscopic metal substrate with islands of zirconium-rich centres within the coating matrix. According to the TEM assessment, the coating thickness was 30 nm for specimens treated for 60 s and 50 nm for those treated for 900 s. The population of the zirconium-rich centers ranged from 2.8 × 10 12 m -2 to 6 × 10 12 m -2 over the treatment period. According to Auger-electron-spectroscopy in-depth analyses, the coating is composed of three diffused layers with an outer region of zirconium oxide followed by a layer of aluminium oxide/hydroxide and an inner layer at the metal/coating interface comprising compounds of aluminium and fluorides. The corrosion-resistance and paint-adhesion characteristics of the zirconium conversion coating are superior to those of bare aluminium.Avtorji so uporabili SEM in TEM/EDX tehnike za preiskavo konverzijske prevleke, nastale na podlogi iz tehni~no~istega aluminija z uporabo Zr nitrat/fluoridne raztopine. Prevleka je nastajala po~asi na mikroskopski kovinski podlagi s posameznimi sredi{~i z Zr bogatih oto~kov znotraj matrice prevleke. S TEM ocenjena debelina prevleke je zna{ala 30 nm na vzorcih po 60-sekundni in 50 nm pri 900-sekundni obdelavi. Populacija z Zr bogatih oto~kov je bila med 2,8 x 10 12 m -2 do 6 x 10 12 m -2 glede na~as obdelave. Globinska analiza z Augerjevo spektroskopijo je pokazala, da je prevleka sestavljena iz treh difuzijskih plasti: zunanje plasti Zr oksida, plasti Al oksida/hidroksida ter notranje plasti pri stiku med kovino in prevleko z vsebnostjo spojin Al in fluoridov. Korozijska odpornost in adhezijske karakteristike za barve konverzijske prevleke na osnovi Zr so bolj{e v primerjavi s tistimi na osnovi~istega (neprevle~enega) aluminija. Klju~ne besede: SEM/TEM/EDX, ultramikrotomija, konverzijska prevleka na osnovi cirkonija, korozija *Corresponding authors e-mails:

show abstract

“…The method for obtaining the conversion layers consists in the simple metal immersion in a conversion bath containing hexafluoride acids or aspersion on the metal 15,16 . Techniques such as electrochemical impedance spectroscopy (EIS) provide aspects of corrosion that can be verified by the polarization resistance values, which, in turn, are obtained by means of impedance diagrams from the raw substrate, pre-coated 17,18 and painted (finished samples) [19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior During the Zirconium Conversion Coating Formation on AISI 1006 Steel

et al. 2019

View full text Add to dashboard Cite

This study investigated a conversion coating based on hexafluorozirconic acid solution on cold-rolled (AISI 1006) steel sheets, in situ, at different pH values and immersion times. Electrochemical characterization was carried out by electrochemical impedance spectroscopy (EIS) with hexafluorozirconic acid bath as the electrolyte. Laser scanning confocal microscopy (LSCM) was used to evaluate the morphology of the coating in situ, i.e., during the coating formation. According to the results, the polarization resistance (Rp) of the conversion coating is affected by the immersion time and by the pH of the conversion bath. The electrochemical analyzes point out conversion baths at pH between 3.5 and 4.5 and immersion times from 600 to 900 s as optimal operating conditions, achieving an average polarization resistance of 713 ± 107 Ω cm 2 .

show abstract

Effects of surface treatment of aluminium alloy 1050 on the adhesion and anticorrosion properties of the epoxy coating

Cited by 91 publications

References 35 publications

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

Influence of Repainting on the Mechanical Properties, Surface Topography and Microstructure of Polyester Powder Coatings

Electron-optical and Auger electron spectroscopy studies of a zirconium conversion coating on aluminium

Electrochemical Behavior During the Zirconium Conversion Coating Formation on AISI 1006 Steel

Contact Info

Product

Resources

About