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Thermally Sprayable Anti-corrosion Marine Coatings Based on MAH-g-LDPE/UHMWPE Nanocomposites

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Abstract

Polymer composite coatings based on low-density polyethylene (LDPE) and ultra-high-molecular-weight polyethylene (UHMWPE) blends were prepared for marine coatings. The incorporation of carboxyl moiety in the polymer blends of LDPE/UHMWPE was carried out by grafting with maleic anhydride (MAH) at varying concentrations of 1-8 wt.% using reactive extrusion process. An optimum percentage of grafting of 2.1% was achieved with 5 wt.% of maleic anhydride. Further, the nanocomposites of MAH-grafted-LDPE/UHMWPE blends were prepared by incorporating cloisite 15A nanoclay at varying concentrations of 1-4 wt.%. The polymer nanocomposites were converted into fine powders suitable for thermal spray having ≤200 μ particle size using cryogenic grinding. The effect of the intact coatings applied on grit-blasted mild steel by thermal spray technique was evaluated for abrasion resistance, adhesion strength, and corrosion resistance. The corrosion resistance of the polymer nanocomposites was studied by salt spray technique and Electrochemical Impedance Spectroscopy The abrasion resistance of coatings increases with increasing UHMWPE content in the blends. However, blends with higher concentration of UHMWPE resulted in coarse coatings with poor adhesion. The coatings with 90:10 MAH-grafted-LDPE/UHMWPE having 3 wt.% of nanoclay showed good abrasion resistance, adhesion strength, and better corrosion resistance.

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Acknowledgment

The authors gratefully acknowledge the Defence Research and Development Organization (DRDO), Government of India, New Delhi for their financial support. The constant support and suggestions provided throughout the course of this investigation by Dr. S.K. Singh, Senior Scientist, NMRL, Ambernath are highly appreciated.

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Authors and Affiliations

  1. Central Institute of Plastics Engineering and Technology (CIPET), Guindy, Chennai, 600032, Tamil Nadu, India

    K. Jeeva Jothi, A. U. Santhoskumar, Syed Amanulla & K. Palanivelu

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  1. K. Jeeva Jothi
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  2. A. U. Santhoskumar
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  3. Syed Amanulla
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  4. K. Palanivelu
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Correspondence to K. Palanivelu.

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Jeeva Jothi, K., Santhoskumar, A.U., Amanulla, S. et al. Thermally Sprayable Anti-corrosion Marine Coatings Based on MAH-g-LDPE/UHMWPE Nanocomposites. J Therm Spray Tech 23, 1413–1424 (2014). https://doi.org/10.1007/s11666-014-0153-7

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  • DOI: https://doi.org/10.1007/s11666-014-0153-7

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