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. 2022 Mar 20;15(6):2308.
doi: 10.3390/ma15062308.

Enhancement of Anticorrosive Performance of Cardanol Based Polyurethane Coatings by Incorporating Magnetic Hydroxyapatite Nanoparticles

Afzal Haq Asif  1 , Mahendra S Mahajan  2 , Nagaraja Sreeharsha  3   4 , Vikas V Gite  2 , Bandar E Al-Dhubiab  3 , Feroze Kaliyadan  5 , Shivakumar H Nanjappa  6 , Girish Meravanige  7 , Dalal Mishary Aleyadhy  1
Affiliations

Enhancement of Anticorrosive Performance of Cardanol Based Polyurethane Coatings by Incorporating Magnetic Hydroxyapatite Nanoparticles

Afzal Haq Asif et al. Materials (Basel). .

Abstract

The present investigation demonstrates renewable cardanol-based polyol for the formulation of nanocomposite polyurethane (PU) coatings. The functional and structural features of cardanol polyol and nanoparticles were studied using FT-IR and 1H NMR spectroscopic techniques. The magnetic hydroxyapatite nanoparticles (MHAPs) were dispersed 1-5% in PU formulations to develop nanocomposite anticorrosive coatings. An increase in the strength of MHAP increased the anticorrosive performance as examined by immersion and electrochemical methods. The nanocomposite PU coatings showed good coating properties, viz., gloss, pencil hardness, flexibility, cross-cut adhesion, and chemical resistance. Additionally, the coatings were also studied for surface morphology, wetting, and thermal properties by scanning electron microscope (SEM), contact angle, and thermogravimetric analysis (TGA), respectively. The hydrophobic nature of PU coatings increased by the addition of MHAP, and an optimum result (105°) was observed in 3% loading. The developed coatings revealed its hydrophobic nature with excellent anticorrosive performance.

Keywords: anticorrosive coatings; cardanol; hydroxyapatite; nanocomposite; polyurethane; renewable materials.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Synthesis of cardanol Mannich polyol.
Scheme 2
Scheme 2
Synthesis of polyurethane from renewable-based cardanol Mannich polyol.
Figure 1
Figure 1
Mechanism for the formation of cardanol Mannich polyol.
Figure 2
Figure 2
FT-IR spectra of cardanol and cardanol Mannich polyol.
Figure 3
Figure 3
1H NMR of cardanol and cardanol Mannich polyol.
Figure 4
Figure 4
FT-IR spectrum of magnetic hydroxyapatite nanoparticles.
Figure 5
Figure 5
Magnetic behavior of the MHAP nanoparticles (a) suspension of nanoparticles and (b) MHAP nanoparticles attracted toward the magnet.
Figure 6
Figure 6
Chemical resistance of bared and prepared PU coatings.
Figure 7
Figure 7
Anticorrosive performance of bared and prepared PU coatings.
Figure 8
Figure 8
Tafel plot of CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated samples in aq. 3.5% NaCl medium.
Figure 9
Figure 9
The inhibition efficiency of bare, CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated samples tested against aq. 3.5% NaCl solution.
Figure 10
Figure 10
Corrosion rate of bare, CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated samples tested against aq. 3.5% NaCl medium.
Figure 11
Figure 11
Contact angle of CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated samples.
Figure 12
Figure 12
Thermogravimetric curves of CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated sample.
Figure 13
Figure 13
SEM images of MHAP, CMPU, CMPU-1, CMPU-2, CMPU-3, CMPU-4, and CMPU-5 coated samples.
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