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Open AccessFeature PaperArticle

Protection of Aluminum Alloy 3003 in Sodium Chloride and Simulated Acid Rain Solutions by Commercial Conversion Coatings Containing Zr and Cr

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TRIMO d.o.o., Prijateljeva c. 12, SI-8210 Trebnje, Slovenia
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Jožef Stefan International Postgraduate School, Jamova c. 39, SI-1000 Ljubljana, Slovenia
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Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova c. 39, SI-1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(9), 563; https://doi.org/10.3390/coatings9090563
Received: 23 July 2019 / Revised: 23 August 2019 / Accepted: 30 August 2019 / Published: 3 September 2019
(This article belongs to the Special Issue Advanced Hybrid Coatings and Thin Films for Surface Functionalization)
The morphology, composition and corrosion properties of commercial hexafluoro-zirconate trivalent chromium coatings (SurTec® 650) deposited on chemically cleaned aluminum alloy 3003 were studied. The coatings were deposited at room temperature using different concentrations of SurTec® 650 (10, 25 and 50 vol.%) and different conversion times (90 s, 11 min and 18 min). Scanning electron microscopy with energy dispersive X-ray spectrometry, X-ray photoelectron spectroscopy and time-of-flight secondary ion spectrometry were employed to investigate the surface morphology, composition and thickness of uncoated and coated AA3003 samples. The morphology of the coating varied from uniform nodular to non-uniform and cracked; coatings were deposited at intermetallic particles and at the alloy matrix. The main constituents of conversion coatings were Zr(IV) and Cr(III) oxides; in addition to oxides, fluorides were also formed. The corrosion properties were investigated in two solutions: more aggressive sodium NaCl and less aggressive simulated acid rain. These commercial conversion coatings exhibited a good corrosion resistance but only after longer immersion in solution, i.e., 24 h. The results reveal an interesting behavior of zirconate-based coatings on aluminum-manganese alloy. View Full-Text
Keywords: aluminum alloy 3003; trivalent chromium process (TCP); hexafluoro zirconate conversion coating; simulated acid rain; sodium chloride; X-ray photoelectron spectroscopy aluminum alloy 3003; trivalent chromium process (TCP); hexafluoro zirconate conversion coating; simulated acid rain; sodium chloride; X-ray photoelectron spectroscopy
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Mujdrica Kim, M.; Kapun, B.; Tiringer, U.; Šekularac, G.; Milošev, I. Protection of Aluminum Alloy 3003 in Sodium Chloride and Simulated Acid Rain Solutions by Commercial Conversion Coatings Containing Zr and Cr. Coatings 2019, 9, 563.

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