Enhanced Corrosion Resistance and Microhardness of Titanium with Electroless Deposition Ni-W-Cr-P Coating.
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| Title: | Enhanced Corrosion Resistance and Microhardness of Titanium with Electroless Deposition Ni-W-Cr-P Coating. |
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| Authors: | Che, Long1 (AUTHOR), Xiao, Min1 (AUTHOR), Xu, Hang1 (AUTHOR), Wang, Bin1 (AUTHOR), Jin, Yong1 (AUTHOR) yongjin-scu@163.com |
| Source: | Materials & Manufacturing Processes. Aug2013, Vol. 28 Issue 8, p899-904. 6p. 1 Black and White Photograph, 2 Charts, 6 Graphs. |
| Subjects: | Corrosion & anti-corrosives, Corrosion resistant materials, Electroless deposition, Microhardness, Coating processes, Titanium |
| Abstract: | In the present study, Ni-W-Cr-P quaternary alloy coatings were prepared on titanium-based alloys by electroless deposition. The morphology, crystal structure, microhardness, and corrosion resistance of samples were studied by scanning electron microscope (SEM), X-ray diffractometer (XRD), microhardness tester, and electrochemical analyzer. The results show that the microstructure of these alloy films changes with the increase of annealing temperature. As-deposited alloy layers belong to nickel-based mischcrystal structure, and its crystallinity was enhanced to 200°C and 300°C, gradually; the new phase Ni3P began to appear at 400°C, completely crystallized at 600°C; Cr1.12Ni2.88and Ni3Ti phases were present at 700°C; Ni and Ni3P phases were totally decomposed at 800°C, and Cr4Ni15W, Cr2Ni3, Ni17W3, Cr, Cr3P, and Ni2P generated. Because of the different structures after annealing, microhardness and corrosion resistance of the alloy coatings possess a relevant change. The Ni–W–Cr–P alloy coatings heated at 600°C exhibit better microhardness and corrosion resistance than those of samples at other annealing temperature. The related mechanisms of those results were also discussed, briefly. [ABSTRACT FROM PUBLISHER] |
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| Database: | Engineering Source |
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| Abstract: | In the present study, Ni-W-Cr-P quaternary alloy coatings were prepared on titanium-based alloys by electroless deposition. The morphology, crystal structure, microhardness, and corrosion resistance of samples were studied by scanning electron microscope (SEM), X-ray diffractometer (XRD), microhardness tester, and electrochemical analyzer. The results show that the microstructure of these alloy films changes with the increase of annealing temperature. As-deposited alloy layers belong to nickel-based mischcrystal structure, and its crystallinity was enhanced to 200°C and 300°C, gradually; the new phase Ni3P began to appear at 400°C, completely crystallized at 600°C; Cr1.12Ni2.88and Ni3Ti phases were present at 700°C; Ni and Ni3P phases were totally decomposed at 800°C, and Cr4Ni15W, Cr2Ni3, Ni17W3, Cr, Cr3P, and Ni2P generated. Because of the different structures after annealing, microhardness and corrosion resistance of the alloy coatings possess a relevant change. The Ni–W–Cr–P alloy coatings heated at 600°C exhibit better microhardness and corrosion resistance than those of samples at other annealing temperature. The related mechanisms of those results were also discussed, briefly. [ABSTRACT FROM PUBLISHER] |
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| ISSN: | 10426914 |
| DOI: | 10.1080/10426914.2013.792412 |
