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Improvement on HVOF sprayed Diamalloy coatings by laser irradiation

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Abstract

We investigated the structure change, surface properties (roughness, porosity, and hardness), tribological, and electrochemical performances of HVOF sprayed Ni-20Cr-10W-9Mo-4Cu-1C-1B-1Fe (Diamalloy-4006) coatings before and after laser irradiation. The results showed that the friction and wear resistance of the coatings were improved significantly with an optimized laser irradiation process. The improvement can be attributed to the improved roughness and hardness, as well as the formation of oxides Cu x O and Cr2O3 tribofilms. With the laser irradiation treatment, the local corrosion of the coating had a decrease and the selective corrosion resistance of the Diamalloy-4006 coating was improved as a result of the decreasing the size and number of the pores, especially compact interface achieved by laser irradiation.

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Acknowledgements

The project was funded by the Key Laboratory of Inorganic coating materials, Chinese Academy of Sciences. This work was also supported by the key research project of the Anhui Educational Administration Office (KJ2011A041) and the International S&T Cooperation Projects of the Anhui Province (10080703019).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui, China

    S. H. Zhang

  2. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai, China

    S. H. Zhang

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  1. S. H. Zhang
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Correspondence to S. H. Zhang.

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Zhang, S.H. Improvement on HVOF sprayed Diamalloy coatings by laser irradiation. Appl. Phys. A 108, 201–209 (2012). https://doi.org/10.1007/s00339-012-6875-9

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  • DOI: https://doi.org/10.1007/s00339-012-6875-9

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