The effect of deposition parameters on the properties of CeCl3 and LaCl3 conversion coatings deposited on three Al-based substrates

Volarič B, Mazare AV, Virtanen S, Milošev I (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Corrosion National Association of Corrosion Engineers

Book Volume: 76

Pages Range: 18-38

Journal Issue: 1

DOI: 10.5006/3303

Abstract

Cerium and lanthanum conversion coatings were deposited from solution of CeCl3 and LaCl3 salts on three aluminum-based substrates: Al, AA2024-T3, and AA7075-T6 to investigate the effect of conversion temperature, conversion time, and addition of hydrogen peroxide. Coatings prepared under different conditions were then analyzed in terms of corrosion properties in 0.1 M NaCl, morphology, topography, and composition. Morphology and composition of the coatings were analyzed using scanning electron microscopy with energy dispersive x-ray spectrometry and x-ray photoelectron spectroscopy. Corrosion resistance, morphology, composition, and homogeneity of coatings were largely dependent on parameters of conversion treatment and type of substrates. Most corrosion resistants were Ce-based coatings produced at 60°C for 1 h in a bath containing CeCl3 and H2O2. La-based coating did not reach comparative resistance when deposited under the same conditions. Morphology of coatings ranged between individual deposits to thick, cracked coatings with nodular morphology. Ce-based coatings predominantly contained Ce(IV) hydroxide when formed with added H2O2. La-based coatings contained La(III) hydroxide mixed with Al(III) hydroxide.

Authors with CRIS profile

Anca Valentina Mazare Lehrstuhl für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) Sannakaisa Virtanen Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)

Involved external institutions

Jožef Stefan Institute SI Slovenia (SI)

How to cite

APA:

Volarič, B., Mazare, A.V., Virtanen, S., & Milošev, I. (2020). The effect of deposition parameters on the properties of CeCl3 and LaCl3 conversion coatings deposited on three Al-based substrates. Corrosion, 76(1), 18-38. https://dx.doi.org/10.5006/3303

MLA:

Volarič, Barbara, et al. "The effect of deposition parameters on the properties of CeCl3 and LaCl3 conversion coatings deposited on three Al-based substrates." Corrosion 76.1 (2020): 18-38.

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