Abstract
A novel method to improve the amorphous phase of electroless Nickel-Phosphorus (EN) coatings is developed by adding surfactants to EN bath. The two surfactants namely sodium dodecyl sulfate (SDS) and cetyltrimethyl ammonium bromide (CTAB) have significant influence on the structure of EN deposits. The EN coated samples were characterized using X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The XRD pattern of all the deposits indicated the presence of nano crystalline and amorphous phases. Addition of surfactants favors the formation of amorphous phase than its crystalline counterpart. The crystallite size was found to varyfrom 20 nm with no surfactant to 8 nm with addition of surfactants. From the TEM study, dark surfaces corresponding to the amorphous phase can be seen and the SAD pattern of the deposit confirms the predominance of this amorphous phase. This favors wear and corrosion resistance applications. The experimental results and analysis are reported in this paper.
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