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. 2023 May 4;13(1):7268.
doi: 10.1038/s41598-023-34085-z.

Preparation of new surface coating based on modified oil-based polymers blended with ZnO and CuZnO NPs for steel protection

Roma G Elfadel  1 , Hala M Refat  1 , H Abd El-Wahab  2 , Salem S Salem  3 , M E Owda  4 , M A M Abdel Reheim  1
Affiliations

Preparation of new surface coating based on modified oil-based polymers blended with ZnO and CuZnO NPs for steel protection

Roma G Elfadel et al. Sci Rep. .

Abstract

In our paper, we have synthesized modified PEA and alkyd resin by replacing the new source of polyol (SDEA) which was confirmed by different analyses such as IR, and 1HNMR spectra. A series of conformal, novel, low-cost, and eco-friendly hyperbranched modified alkyd and PEA resins were fabricated with bio ZnO, CuO/ZnO) NPs through an ex-situ method for mechanical and anticorrosive coatings. The synthesized biometal oxides NPs and its composite modified alkyd and PEA were confirmed by FTIR, SEM with EDEX, TEM, and TGA, and can be stably dispersed into modified alkyd and PEA resins at a low weight fraction of 1%. The nanocomposite coating was also subjected to various tests to determine their surface adhesion, which ranged from (4B-5B), physico-mechanical characteristics such as scratch hardness, which improved from < 1.5 to > 2 kg, gloss (100-135) Specific gravity (0.92-0.96) and also chemical resistance test which passed for water, acid, and solvent except alkali, was poor because of the hydrolyzable ester group in the alkyd and PEA resins. The anti-corrosive features of the nanocomposites were investigated through salt spray tests in 5 wt % NaCl. The results indicate that well-dispersed bio ZnO and CuO/ZnO) NPs (1.0%) in the interior of the hyperbranched alkyd and PEA matrix improve the durability and anticorrosive attributes of the composites, such as degree of rusting, which ranged from 5 to 9, blistering size ranged from 6 to 9, and finally, scribe failure, which ranged from 6 to 9 mm. Thus, they exhibit potential applications in eco- friendly surface coatings. The anticorrosion mechanisms of the nanocomposite alkyd and PEA coating were attributed to the synergistic effect of bio ZnO and (CuO/ZnO) NPs and the prepared modified resins are highly rich in nitrogen elements, which might be regarded as a physical barrier layer for steel substrates.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Preparation of salicylic diethanolamine (SDEA).
Figure 2
Figure 2
Preparation of SDEA-modified PEA.
Figure 3
Figure 3
Preparation of modified alkyd resin.
Figure 4
Figure 4
Biosynthesis of CuO / ZnO NPs using biomass filtrate of P. corylophilum As-1.
Figure 5
Figure 5
Preparation of nanocomposite modified PEA and alkyd resin.
Figure 6
Figure 6
Characterization of the biosynthesized ZnO NPs (A) denotes SEM image, (B) denotes TEM image.
Figure 7
Figure 7
SEM image (A) and TEM image (B) for CuO/ZnO.
Figure 8
Figure 8
SEM images of blank PEA and alkyd (A, B), bio CuO/ZnO nanocomposite modified PEA (C) and bio ZnO nanocomposite modified alkyd resin (D).
Figure 9
Figure 9
TGA of the dry coated film based on bio- CuO/ZnO nanocomposite modified PEA.
Figure 10
Figure 10
TGA of the coated film based on bio ZnO nanocomposite modified alkyd resin.
Figure 11
Figure 11
SEM with EDX image for paint-based bio CuO/ZnO nanocomposite modified PEA resin.
Figure 12
Figure 12
SEM with EDX image for paint-based bio ZnO nanocomposite modified alkyd resin.
Figure 13
Figure 13
Photographic images (A) blank coating, (B) coating based on CuO/ZnO nanocomposite modified PEA resin (C) coating based on bio ZnO nanocomposite modified alkyd resin.
Figure 14
Figure 14
Mechanism of corrosion protection.
Figure 15
Figure 15
SEM images of (A) blank coating, (B) coating based on CuO/ZnO nanocompos-ite modified PEA resin (C) coating based on bio ZnO nanocomposite modified alkyd resin.
See this image and copyright information in PMC

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