Investigation of the correlation between surface properties and surface chemistry of electroless nickel coatings

Corrosion and erosion resistance of high phosphorus (more than 10 wt.%) and low phosphorus (1–2wt.%) electroless nickel (EN) coatings are investigated using scanning Auger microscopy and X-ray photoelectron spectroscopy. The results support the observations of others showing the correlation between...

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Bibliographic Details
Published in:Thin solid films 1990, Vol.193 (1-2), p.270-279
Main Authors: Moore, Richard L., Salvati, Lawrence
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Metals. Metallurgy
Production techniques
Surface treatment
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Summary:Corrosion and erosion resistance of high phosphorus (more than 10 wt.%) and low phosphorus (1–2wt.%) electroless nickel (EN) coatings are investigated using scanning Auger microscopy and X-ray photoelectron spectroscopy. The results support the observations of others showing the correlation between nickel-to-phosphorus ratios and the chemical-mechanical properties of the coatings. The present study gives further insight into the mechanisms responsible for surface chemistry modification and subsequent change in properties as a result of process variables and heat treating. Angle-dependent X-ray photoelectron spectroscopy results showed that the thickness of the passivated surface oxide formed on as-plated EN materials was proportional to the phosphorus content of the deposit. The model derived from this and Auger data implied a layered structure, with a nickel oxide over a phosphate film on the EN alloy surface. Heat treating thickened the oxide and depleted the underlying alloy of nickel.
ISSN:0040-6090
1879-2731
DOI:10.1016/S0040-6090(05)80036-7