Study of the Corrosion Behavior of Nanocrystalline Ni-P Electrodeposited Coating
Resource
Metallurgical and Materials Transactions A, 41(2), 450-459
Journal
Metallurgical and Materials Transactions A
Pages
450-459
Date Issued
2010
Date
2010
Author(s)
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. © 2009 The Minerals, Metals & Materials Society and ASM International.
Type
journal article
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