Research Project: Toz Boya Sistemlerinin Mxenes ve Organometalik Bileşikler İle Adezyon ve Korozyon Direncinin Arttırılması
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Contributors
Funders
ID
TB.00519
Authors
Aydemir, Umut
Faculty Member
Publications
Ti3C2MXene/polyaniline/montmorillonite nanostructures toward solvent-free powder coatings with enhanced corrosion resistance and mechanical properties
(Amer Chemical Soc, 2023) Aydemir, Umut; Nazarlou, Ziba; Hosseini, Seyyedeh Fatemeh; Dorraji, Mir Saeed Seyed; Rasoulifard, Mohammad Hossein; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); Department of Chemistry; Graduate School of Sciences and Engineering; Yes; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING; Research Center
Solvent-free powdercoatings have become very popular in the coatingindustry in replacing conventional liquid coatings for the last decades.However, poor adhesion of powder coatings to the substrate and microporesinevitably created during the curing process of coatings lead to localizedcorrosion and reduced mechanical resistance. For this purpose, Ti3C2 MXene/polyaniline (PANI)/montmorillonite (MMT)nanocomposites with superior conductivity and adhesion capabilitieswere incorporated into the eco-friendly powder coating. The as-synthesizednanocomposites were analyzed using various techniques such as Fouriertransform infrared spectroscopy, X-ray diffraction, X-ray photoelectronspectroscopy, high-resolution transmission electron microscopy, field-emissionscanning electron microscopy, and Raman spectroscopy. To evaluatethe effectiveness of the powder coating in preventing corrosion ona mild steel substrate, two methods were employed: potentiodynamicpolarization and electrochemical impedance spectroscopy. The electrochemicaltests revealed that an excellent dispersion of 1.5 wt % Ti3C2 MXene/PANI/MMT nanosheets in a polyester/epoxy powdercoating resulted in superior anti-corrosion performance (4.8 x10(6) omega) after 42 days of immersion in 3.5 wt % NaClas compared to blank samples (7.2 x 10(2) omega).According to Tafel analysis, the corrosion potential of the optimalsample is -0.062 V, which is more positive than that of thepristine powder coating (-0.83 V). The polarization resistance(R (p)) and corrosion current (i (corr)) of the optimal sample are determined to be 3.39x 10(6) omega center dot cm(2) and 7.69 x10(-9) A center dot cm(-2), respectively.Moreover, the optimal sample marginally increased the hardness (229.42MPa) compared to the pure sample (152.68 MPa) due to the synergisticeffect of Ti3C2 MXene and flake-like MMT nanoparticles,which results in an improvement in the mechanical strength of powdercoatings. Additionally, the presence of PANI caused further crosslinkingand modulation of the electrical conductivity of the produced nanocomposites.The present study proposes a practical method to enhance the mechanicaland shielding properties of solvent-free powder coatings, making themsuitable for use in various real-world applications, including commercial,medical, and household sectors.
Enhancing corrosion resistance and tribomechanical characteristics of powder coatings via the integration of functionalized HF-Free MXene reinforcements
(Wiley, 2024) Aydemir, Umut; Nazarlou, Ziba; Peighambardoust, Naeimeh Sadat; Motlagh, Peyman Lahe; Department of Chemistry; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); Graduate School of Sciences and Engineering; Yes; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING; Research Center
MXene, a new generation of 2D materials, is gaining attention for anti-corrosion applications due to its large surface area, electrical conductivity, and self-healing properties. Its low shear strength and self-lubricating properties enhance wear resistance. Herein, silane functionalized HF-Free MXene nanosheets "MS-f_Ti3C2 and MS-f_Ti3C2@Zn" synthesized through the molten salt method are integrated into the environmentally sustainable powder coating. The electrochemical tests indicate that a powder coating containing a well-dispersed 1.5 wt.% f_Ti3C2@Zn nanosheets exhibit the highest polarization resistance (1.1 x 106 ohm cm2), lowest Icorr (2.15 x 10-8 A cm-2) and superior anti-corrosion performance after 42 days of immersion in 3.5 wt.% NaCl. The polarization resistance (Rp) and corrosion current (Icorr) of the untreated coating are measured to be 1.6 x 103 ohm cm2 and 1.6 x 10-5A cm-2, respectively. In addition, the incorporation of MXene material reduces crack development and spalling, and enhances wear resistance during the friction process. The loading of 1.5 wt.% f_Ti3C2@Zn reduces the coefficient of friction (COF) and improves wear rate by 45% and 51%, respectively Analysis of composites via nanoindentation reveals such enhanced mechanical properties. This study presents an effective and sustainable approach to improve the mechanical, tribological, and long-term corrosion protection of organic coating, thereby exhibiting great potential for using HF-Free MXene as a multipurpose additive. Incorporating amino silane-functionalized, HF-free MXene nanosheets into eco-friendly powder coatings significantly enhances corrosion resistance and tribomechanical properties. The addition of just 1.5 wt.% of these nanosheets improves mechanical strength, reduces friction, and provides superior long-term corrosion protection. This sustainable approach offers a high-performance coating solution suitable for a wide range of applications. image
