Improving the properties of mild steel by ternary multilayer composite coating via electrodeposition route

Abstract

ABSTRACT.A wide range of metal-oxides exhibit fascinating properties and multiple functionalities that could address challenge of physical and mechanical deterioration of materials in service. In this study, Zn-ZrO2, Zn-SiC and Zn-ZrO2-SiC composite coating was fabricated from zinc based sulphate electrolyte at constant current density, depth of immersion, distance between anode and cathode with time of deposition. The effect of particle on the physical behaviour of the coating was examined by coating gauge tester for the coating thickness and coating texture. The mechanical properties in term of hardness and wear characteristics were examined using high diamond micro-hardness tester and three body abrasive MTR-300 testers with dry sand rubber wheel apparatus with 5 N and 15 N, respectively. The coating stability in harsh region was examined with isothermal furnace at 200 o C for 4 h. The structural behaviour was investigated using scanning electron microscope attached with energy dispersion spectroscopy (SEM/EDS). The result shows that significant improvements in wear and hardness properties are linked to the microstructural modification of the coating as a result of the embedded particulate. The strengthening behaviour was improved with about 98% of coating efficiency. The progression of the coating thickness and texture were in line with other results obtained.

Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

“…In contrast, Al and Mo showed the lowest potentials. Only Ni 50 Fe 40 Co 10 and Ni 50 Fe 40 Cr 10 alloys showed a short region of active to passive. Nevertheless, Ni 50 Fe 40 Al 10 alloy showed the lowest corrosion rate ) in 3.5% NaCl.…”

“…In Figure 2, broad bands are observed in the region 0.2-1.5 V which suggests the intense passive regions for the alloys at diverse current densities. The results in Table 2 10 (X= Ta < Co < Cr < Ti < Mo < Al).…”

“…This decrease indicates anodic dissolution of the alloys and cathodic hydrogen evolution reaction processes. Unlike the behavior of the alloys in 1 M H 2 SO 4 solution, addition of other elements to Ni-Fe improved its corrosion resistance in 3.5% NaCl solution with Ni 50 Fe 40 Al 10 showing the lowest corrosion rate.…”

“…The corrosion rates of the alloys in 3.5% NaCl are as follows: Ni 50 Fe Ta) < Ni 50 Fe 50 < Ni 50 Fe 40 Co 10 . It was observed that all the alloys generally exhibited lower corrosion rates in chloride solution compared to sulfuric acid solution.…”

“…Diverse reports are available on imparts of alloying on the chemical, microstructural and phases characterization/behavior of different type of engineering materials. These include the super-alloys, steels and aluminum alloys [5][6][7], nickel nano-particles [8] and titanium base alloys, etc., and their corrosion behaviors [9] and control [10][11][12][13][14][15] in different media [16][17][18]. The current research development in the Ni-Fe-based austenitic matrix which falls under the category of Ni-based alloys is beginning to receive attention from researchers.…”