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標題: Study of the Corrosion Behavior of Nanocrystalline Ni-P Electrodeposited Coating
作者: Lee, H.B.
Wuu, D.S.
Lee, C.Y.
Lin, C.S.
關鍵字: electrochemical-behavior;sulfuric-acid;phosphorus;alloys;nickel;composites;passivity
Project: Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
期刊/報告no:: Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, Volume 41A, Issue 2, Page(s) 450-459.
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 mu m as the temperature and potential were increased to 50 A degrees C and 600 mV(SCE), 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.
ISSN: 1073-5623
DOI: 10.1007/s11661-009-0101-1
Appears in Collections:材料科學與工程學系

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