Corrosivity of Sulphide Solutions Against Ni-P-TiO2-ZrO2 Electroless Nanocomposite Coatings
In surface engineering it is found that to incorporate nano particle into Ni-P matrix is very useful. Inrecent investigation, the electroless Ni-P-TiO2-ZrO2 nano-composite plating has been deposited upon mild steel substrate(AISI 1040). The 2.5 gpl each TiO2 and ZrO2 nano-particles were incorporated into an acidic electroless Ni-P matrix as a second phase material and were reducedby a reducing chemical called as sodium hypophosphite(Na2HPO3). The coating thickness is in micrometer range. After the coating, as-prepared Ni-P-TiO2-ZrO2EL deposition were heated at 400°C in Argon atmosphere for one hour duration to investigate the heat effect on coatings and were analyzed by SEM/XRD/EDX methods. A homogeneous and weighty consistent allocation of TiO2 and ZrO2 nano-particles into EL Ni-P matrix is recognized through analysis of SEM and EDAX methods. From the corrosion test result it observed that he sulphide solutions with chloride are more corrosive than without chloride. Sodium sulphide, thiosulphates and sodium chloride is suggested to be main corrosive chemicals.The corrosion resistance of the conventional materials and Ni-P-TiO2-ZrO2 coated samples are in following order as SS2205> Ni-P-TiO2-ZrO2(As-plated)>Ni-P-TiO2-ZrO2(Heated)> MS.
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