Improved corrosion protection of aluminium alloy AA 2024 by sol–gel hybrid coatings after surface pretreatment by silanisation

In order to contribute to the corrosion protection of aluminum alloys, silane-based hybrid coatings have been widely studied in the aerospace industry for their good adhesion to aluminum substrates, compatibility with organic paintings and to protect the underlying material, in addition to being much less toxic than the commonly used chromatization process. In this work, hybrid and inorganic sol-gel coatings were evaluated as corrosion inhibitor films for AA2024-T3 alloy. The films were characterized by linear polarization resistance (LPR) and scanning electron microscopy (SEM), which indicated that these coatings provide a lower tendency for the substrate corrosion.

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Sol–gel coatings for pitting corrosion resistance of AA 2024-T3 aluminium alloy

Innovative Pre-Treatment Techniques to Prevent Corrosion of Metallic Surfaces ◽

10.1533/9781845693688.52 ◽

2007 ◽

pp. 52-62

Author(s):

Y. Sepúlveda ◽

E. González ◽

M.A. Páez ◽

C.M. Rangel ◽

P. Skeldon ◽

...

Keyword(s):

Corrosion Resistance ◽

Aluminium Alloy ◽

Pitting Corrosion ◽

Sol Gel ◽

Pitting Corrosion Resistance ◽

Aa 2024

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Influence of the pH On the Corrosion Protection of Epoxy-Silica-Zirconia Sol-Gel Coatings Applied On EN Aw-6063 Aluminium Alloy

ECS Meeting Abstracts ◽

10.1149/ma2013-02/17/1701 ◽

2013 ◽

Keyword(s):

Aluminium Alloy ◽

Corrosion Protection ◽

Sol Gel

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Sol–gel coatings for corrosion protection of 1050 aluminium alloy

Electrochimica Acta ◽

10.1016/j.electacta.2010.01.074 ◽

2010 ◽

Vol 55 (10) ◽

pp. 3518-3527 ◽

Cited By ~ 26

Author(s):

Z. Feng ◽

Y. Liu ◽

G.E. Thompson ◽

P. Skeldon

Keyword(s):

Aluminium Alloy ◽

Corrosion Protection ◽

Sol Gel

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Processing and Properties of GPTMS-TEOS Hybrid Coatings on 5083 Aluminium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.736 ◽

2011 ◽

Vol 239-242 ◽

pp. 736-742 ◽

Cited By ~ 5

Author(s):

Hamed Rahimi ◽

Reza Mozafarinia ◽

Reza Shoja Razavi ◽

Ebrahim Paimozd ◽

Akbar Hojjati Najafabadi

Keyword(s):

Aluminium Alloy ◽

Aging Time ◽

Corrosion Behaviour ◽

Sol Gel ◽

Hybrid Coatings ◽

Hybrid Nanocomposite ◽

Adhesion Test ◽

Good Adhesion ◽

Polarization Behaviour ◽

Acid Catalyzed

The hybrid nanocomposite coatings were processed in solution using acid-catalyzed hydrolysis and condensation of precursors 3-Glycidoxypropyl trimethoxysilane (GPTMS) and Tetraethoxysilane (TEOS) forming self assembled nanoscale composite. Coating were applied by dipping 5083 aluminium alloy in sol-gel solutions at several stages and different aging times. Effect of GPTMS-TEOS sol's aging time on thickness, adhesion, and corrosion behaviour of hybrid organic-inorganic GPTMS-TEOS sol-gel coatings have been investigated. The results indicated that thickness of hybrid coatings increased but adhesion decreased with increasing aging time. Adhesion test and electrochemical polarization behaviour reveal that if the coating process was chosen correctly, the coating had a good adhesion strength and corrosion resistance.

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