Micheal D. Afuwape, Ojo S.I Fayomi and Joshua. O Atiba
Mots-clés : Mild Steel, Electroless deposition, Corrosion, Magnesium oxide
Résumé :
<p class="MsoNormal" style="line-height:normal">The biggest
issues with mild steel have been corrosion and degradation in mechanical
qualities over a short time of use. However, corrosion control has become
increasingly crucial in the manufacturing industry in recent years. Mild steel
(a low carbon steel type) is one of the most extensively utilized engineering
materials due to its versatility, low cost, and vast industrial application. As
a result, Zn-Ni-Mg-P was coated on mild steel using electroless deposition
processes in accordance with ASTM B733 criteria is tested by Experimental means
to combat corrosion.
The coating baths were developed; containing the tin phosphorous alloy of
nickel, Ni-Mg-P, The MgO was included in the baths, varying its composition
between 0,2,4,6 and 8g. The coating was achieved in 30 minutes at a stirring
rate of 150 rpm at a temperature of 45<sup>o</sup>C with a pH of 5. The
corrosive properties of the coated steel and the uncoated steel were examined
with the Potentiodynamic polarization method in 3.65%
NaCl solution following the ASTM G102 standard, The SEM/EDS and XRD were used
to analyze the coatings' microstructures. It was found that the coatings
considerably improved the mild steel's characteristics. The Control exhibited
the corrosion rate (Cr) and corrosion current density (j<sub>corr</sub>) of 0.00046873 mm/year and 4.0338E-08<sup>
</sup>A/cm<sup>2</sup>, respectively. For the Ni-Mg-P
phase, the corrosion rate (Cr) and corrosion current density (j<sub>corr</sub>)
between 0.000405 – 0.000255 mm/year and 3.4906×10<sup>-8 </sup>– 2.1945×10<sup>-8
</sup>A/cm<sup>2 </sup>for Sample (6-9).
The SEM images revealed that Sample 9 consisting of 8g/mol MgO, displayed a
refined microstructure and smoother morphology than that of Sample 6 with
2g/mol of MgO. The XRD profile of Sample 6 and Sample 9 FeSn crystal exhibited
the highest peak intensity of 1900 a.u at
2θ = 40<sup>o </sup> , which
indicated that the coated material possessed microstructural homogeneity and
high stability.</p>
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