Localised corrosion assessement of crambe-oil-based polyurethane coatings applied on the ASTM 1200 aluminum alloy

Nardeli, Jéssica Verger; Snihirova, Darya; Fugivara, Cecilio Sadao; Montemor, M.F.; Pinto, Elaine Ruzgus Pereira; Messaddecq, Y.; Benedetti, Assis Vicente

doi:10.1016/j.corsci.2016.05.034

Cited by 35 publications

(22 citation statements)

References 54 publications

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“…The aluminium ions hydrolysis reduces the local pH values of the anodic areas, making the medium more aggressive inside the pit [ 49 ], which accelerates the corrosion process. This effect leads to the accumulation of corrosion products and increases internal stresses.…”

Section: Resultsmentioning

confidence: 99%

“…High pH values in the cathodic area ( Figure 3 —1b,2b) at the initial stage of specimen exposure are also connected with the presence of dissolved oxygen in the NaCl solution, which leads, as a result of contact with the aluminium alloy substrate, to oxygen reduction as a cathodic reaction, and to dissolution of aluminium as an anodic one [ 49 ]: O 2(g) + 2H 2 O (l) + 4e − → 4OH − (aq) Al (s) → Al 3+ (aq) + 3e − …”

Section: Resultsmentioning

confidence: 99%

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Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

et al. 2018

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This work consists of two parts. In the first part, the kinetics and mechanism of corrosion on the surface of the welded joint area of the aircraft 1579 aluminium alloy have been studied using SVET (scanning vibrating electrode technique) and SIET (scanning ion-selective electrode technique) in 0.5 M NaCl. The results have revealed the corrosion process development within the weld interface due to the presence of microdefects in the morphological structure. Features of the 1579 Al alloy corrosion have also been investigated through immersion experiments, quantitative analysis of dissolved alloying elements by means of atomic absorption spectroscopy, and corrosion products characterization using XRD (X-ray diffraction) analysis. The presence of Mg as an alloying element in the 1579 Al alloy sufficiently increases the bulk pH values as a result of the intensive dissolution of Mg. These factors accelerate the corrosion activity of the studied material in the 0.5 M NaCl solution. Corrosion evolution analysis of the 1579 Al alloy sample showed the importance of the coating formation to protect this alloy against corrosion and to increase the stability of this system in the corrosive media.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

et al. 2018

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“…The corrosion activity of the welded zone was examined using modern informative methods of localized corrosion identification [22,23,24,25,26,27,28,29,30,31,32,33,34]. The microstructure analysis, microhardness distribution along the different zones of 1579 aluminum alloy weld were performed for the first time in correlation with determination of the localized electrochemical activity of the material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Corrosion Resistance of TIG Welded 1579 Alloy

et al. 2019

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The paper studies microstructure, chemical composition and corrosion activity of the tungsten inert gas welded joint of the Al-Mg-Sc alloy. An intensive corrosion attack of the heat affected zone (HAZ) was found due to precipitation of secondary phases at recrystallized grain boundaries. The ccorrosion process initiated along the boundary of α-Al grains, where a high concentration of anodic (Mg2Si and Mg2Al3) and cathodic phases ((MnFe)Al6) was observed. Increased temperatures during welding led to coalescence of the anodic phases in HAZ. Additionally, HAZ was found to be enriched with hard intermetallic compounds (Mg2Si and (MnFe)Al6). This area had a higher microhardness (930 MPa) compared to base metal (BM, 895 MPa) and fusion zone (FZ, 810 MPa). The volume fraction of secondary phases was 26% in BM, 28% in FZ and 38% in HAZ. The average grain size increased in the following order: (9 ± 3) µm (BM) < (16 ± 3) µm (HAZ) < (21 ± 5) µm (FZ). A plasma electrolytic oxidation (PEO) coating of aluminum-based material was applied to protect the weld from oxidation. The PEO-coating provided a high corrosion protection in the aggressive Cl−-containing environment.

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“…The initial studies of crambe oil-based polyurethane indicated great dependence of the electrochemical response on the nature of the resin composition [22,23], and it was also observed that after applying a scratch on the coating surface, the self-healing property was present in a resin-based coating, in which the pristine was less resistant to corrosion [24]. Conversely, the pristine that showed better corrosion resistance did not present the self-healing property [24]. This has called our attention to investigate the corrosion resistance of different coatings formulations by changing the components and their proportions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polyurethane Monolithic Resins and Modification with a Condensed Tannin-Yielding Self-Healing Property

et al. 2019

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Resins of polyurethane were prepared from vegetable oils (crambe and castor) and modified by adding green corrosion inhibitor (condensed tannin). The oils were characterized by gas chromatography with flame-ionization detection (GC-FID), attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR) and thermogravimetric analysis (TGA). The reaction was monitored by characterizing the intermediate products (polyester and prepolymer). The polyester was characterized by solubility in methanol, acidity index, hydroxyl groups and FTIR-ATR, and the prepolymer was characterized by solid content, solvent content, isocyanate (NCO) groups and FTIR-ATR. The formation of PU resins was confirmed by FTIR-ATR and TGA, and the presence of tannin particles incorporated in the coating can be observed by optical microscopy (OM). The absence of the band attributed to NCO in FTIR-ATR spectra of the resins confirmed the complete reaction between polyester and prepolymer. The OM observation and a video demonstrate that Polyurethane (PU)-modified with condensed tannin resin presents self-healing effect, probably through the formation of new hydrogen bonds when in contact with deionized water. Therefore, these results open possibilities for new synthetic routes aiming at improving the very important self-healing property for protecting metals and their alloys against corrosion, extending significantly the metallic materials lifetime as previously demonstrated by our group.

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Localised corrosion assessement of crambe-oil-based polyurethane coatings applied on the ASTM 1200 aluminum alloy

Cited by 35 publications

References 54 publications

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 1: Specificity of Development

Effect of Microstructure on the Corrosion Resistance of TIG Welded 1579 Alloy

Preparation of Polyurethane Monolithic Resins and Modification with a Condensed Tannin-Yielding Self-Healing Property

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