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Study of the Corrosion Behavior of Nanocrystalline Ni-P Electrodeposited Coating

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Abstract

The corrosion behavior of electrodeposited Ni-P coating in 5 pct (in weight) NaCl solution has been studied. The microstructure of the Ni-P electrodeposit displayed a layered structure composed of nanocrystalline grains revealed by transmission electron microscopy (TEM). With the increase in polarization potential and bath temperature, the corrosion rate as well as the weight loss was significantly increased. Under observation by a field-emission scanning electron microscope (FESEM), the pitting evolved into larger sizes with a diameter of approximately 30 μm as the temperature and potential were increased to 50 °C and 600 mVSCE, respectively. Cracks and delamination among the layered structure were found inside the deepened corrosion pit. The increase in surface P content and the trace of the formation of phosphate were also observed by using X-ray photoelectron spectroscopy (XPS) analysis.

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  1. VersaProbe is a trademark of ULVAC-PHI, Inc., Chigasaki, Japan.

  2. EG&G is a trademark of Artisan Scientific Corporation, Champaign, IL.

  3. HMV-2 is a trademark of Shimadzu Corporation, Kyoto, Japan.

  4. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Acknowledgments

The rotating immersion corrosion tester provided by Professor T.H. Chuang, Department of Materials Science and Engineering, National Taiwan University, is gratefully acknowledged. The authors also thank Ms. Y.C. Lin, National Chung Hsing University, for her help in performing the XPS measurements.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan R.O.C.

    H.B. Lee (Ph.D. Candidate) & D.S. Wuu (Professor)

  2. Department of Mechanical Engineering, National Taipei University of Technology, Taipei, 106, Taiwan R.O.C.

    C.Y. Lee (Professor)

  3. Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan R.O.C.

    C.S. Lin (Professor)

Authors
  1. H.B. Lee
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  2. D.S. Wuu
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  3. C.Y. Lee
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  4. C.S. Lin
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Corresponding author

Correspondence to D.S. Wuu.

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Manuscript submitted August 22, 2009.

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Lee, H., Wuu, D., Lee, C. et al. Study of the Corrosion Behavior of Nanocrystalline Ni-P Electrodeposited Coating. Metall Mater Trans A 41, 450–459 (2010). https://doi.org/10.1007/s11661-009-0101-1

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