| MENG Pei-yuan,SUN Lin-lin.Flame Sprayed UHMWPE/Graphene Nanosheet Composite Coatings for Marine Applications[J],46(10):35-41 |
| Flame Sprayed UHMWPE/Graphene Nanosheet Composite Coatings for Marine Applications |
| Received:May 13, 2017 Revised:October 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.10.006 |
| KeyWord:ultra-high molecular weight polyethylene (UHMWPE) graphene corrosion resistance wear resistance marine biofouling coating flame spraying |
| Author | Institution |
| MENG Pei-yuan |
Xijing University, Xi'an , China |
| SUN Lin-lin |
Xijing University, Xi'an , China |
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| Abstract: |
| Marine corrosion, washout and biofouling are key problems to be resolved for marine infrastructures during their service process. Thermal spraying technology has been developed as one of surface protection methods. Thermal sprayed coating can protect metal substrates against corrosion and washout effectively, and inhibit heavy damage from biofouling to marine materials based upon material selection and structural design. UHMWPE-graphene composite powder was prepared in the method of high energy ball milling. UHMWPE and UHMWPE-graphene composite coatings were prepared on E235B carbon steel substrate by adopting flame spraying technology. Microstructure of original powder and as-deposited coatings was characterized by using scanning electron microscope (SEM) and transmission electron microscopy (TEM). Seawater washout resistance, corrosion resistance and biofouling resistance of the coatings was evaluated by performing friction and wear experiment, electrochemical test and biofouling test, respectively. Compared with carbon steel and UHMWPE coating, corrosion potential of UHMWPE-graphene composite coatings increased while corrosion current decreased, indicating that corrosion resistance characteristic of the sample was enhanced. Since UHMWPE-graphene composite coatings exhibited hydrophobicity and lower surface energy, it has excellent resistance to seaweed adhesion. Friction coefficient and wear rate of grapheme-doped composite coatings were lower than that of pure UHMWPE coating. For the coating containing 0.5wt.% grapheme, friction coefficient decreased from 0.236 to 0.195, and wear rate decreased by nearly 26%. Compact UHMWPE coating, UHMWPE-0.2% graphene and UHMWPE-0.5% grapheme composite coatings are successfully prepared on carbon steel by adopting flame spraying technology. Addition of grapheme can effectively improve corrosion resistance, boifouling resistance and wear resistance of the coatings in simulated marine environment. |
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