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Effect of coating time and heat treatment on structures and corrosion characteristics of electroless Ni–P alloy deposits by H. Ashassi-Sorkhabi; S.H. Rafizadeh is a Engineering article available to read on EtoBox.

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Mild steel was electroless coated with nickel-phosphorus alloy from a bath containing sodium hypophosphite and glycincitrate complexing agents. The effect of coating time on phosphorus content, thickness, structure and hardness of the deposits were analyzed. Corrosion parameters such as current density, corrosion potential and corrosion rate were obtained from tafel polarization curves and immersion corrosion tests in aerated 3.5% NaCl solution. The X-ray diffraction (XRD) patterns, anodic polarization curves and scanning electron microscopy (SEM) of heat-treated specimens obtained in various coating times were also studied. The X-ray diffraction patterns showed that by changing the coating times, amorphous or crystalline structure could be obtained. The coatings containing 11.1-13.1% phosphorous were amorphous, and showed better corrosion resistance than microcrystalline structure. The heat-treated specimens obtained in different coating time had more hardness and corrosion resistance than unheated samples. According to the polarization studies and scanning electron microscopy images, the heat-treated samples with 10.8 and 10.1% phosphorous show the intergranular corrosion, while

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Author

H. Ashassi-Sorkhabi; S.H. Rafizadeh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)