Effect of composite particulate reinforcement on the morphology, anti-corrosion and hardness properties of fabricated Zn-ZnO coatings

Co-deposition of zinc metal matrix with ZnO composite was fabricated from electrolytic chloride based coating consisting of 20-40g/L ZnO particle. The resulting composite coatings were characterized using high optic microscope (OPM). The corrosion resistance properties of Zn-ZnO composite coatings were measure using linear polarization in 3.5% NaCl solution. The variation of amount of ZnO %wt. inclusion of the composite on micro-hardness was investigated using dura scan diamond base micro-hardness tester. The results obtained indicate that the introduction of ZnO particles in the deposition bath obviously increase significantly the hardness properties. The increases in hardness value are attributed to the realization of coherent and even precipitate into the metal lattice. The corrosion polarization resistance also improved slightly as against the MS. It was found that addition of ZnO %wt support strengthening characteristics toward hardness improvement with slight enhancement in anti-corrosion properties

Physio-Chemical and Mechanical Behaviour of(Pinussylvestris) as Binders on Foundry Core Strength

The mechanical potential of sand core binders made withPinussylvestris has been examined. Ota silica base sand bonded with 6% of cassava starch in admixed proportion of Pinussylvestris was tested for tensile, compressive strength and permeability to establish the binding efficiency. Tensile strength of the green baked core were oven baked at 50°C, 100°C, 150°C and 200°C.The cylindrically shaped permeability specimens were tested with permeability meter. Study revealed thatPinussylvestris showed an improve properties at 6% cassava starch at 200°C

Comparative study on the effect of NaNO2 in corrosion inhibition of micro-alloyed and API-5L X65 steels in E20 simulated FGE

may positively slow down corrosion rate, its concentration within the tested range of 0.2 – 1.0 g/L plays an insignificant role in improving the corrosion resistance of API-5L X65 and micro-alloyed steels. Morphological examination of both steels after immersion tests in the presence and absence of the inhibitor showed pitting corrosion mechanism. Furthermore, statistical analysis confirms with 90 % confidence, that there is no significant difference between the corrosion behaviour of the two steels in E20 SFGE with and without NaNO2 inhibitor. Highest protection of the metal surface was achieved at 62.63 % with 0.2 g/L NaNO2 for API-5L X65 in E20. in E20 SFGE with and without NaNO2 inhibitor. Highest protection of the metal surface was achieved at 62.63 % with 0.2 g/L NaNO2 for API-5L X65 in E20

ZnO as corrosion inhibitor for dissolution of zinc electrodeposited mild steel in varying HCl concentration

The corrosion behavior of Zn electrodeposition on mild steel in varying 0.1 to 0.5 M of HCl with and without inhibitor was studied using weight loss measurement and optical microscope. The (OP) results revealed that the corrosion mechanism layers of the zinc plated mild steel without inhibitor has high content corrosivity related to the appearance of cracks due to the dissolution into the acidic medium. However, the zinc electrodeposition with ZnO as an inhibitor in the test medium shows a stable layer formation. The Zn coatings were found to contain an insoluble corrosion products, which act as a corrosion barrier that prevent corrosion from been attacked by the hydrogen presence

Performance Evaluation of Zinc Deposited Mild Steel in Chloride Medium.

The effect of deposited mild steel under plating variable influence was investigated in a chloride medium. The results showed homogeneous layer with improved surface adhesion after deposition. The distance between the anode and the cathode on voltage, plating time and coating thickness were observed. The mild steel was deposited into solution of zinc bath for varying voltage between 0.6 v and 1.0v. It was discovered that the sample plated at 1.0v for 15 minutes gives the best plating surface finish. Analytical study using potentiastat/galvanostat, focused ion beam scanning electron microscopy (FIB-SEM), XRD and AFM were used to determine the surface characterization, topography and corrosion evaluation of the substrat

Study of Al2O3/SiC particle loading on the microstructural strengthening characteristics of ZneAl2O3eSiC matrix composite coating

In this paper, the microstructure, and mechanical performance of ZneAl2O3eSiC film codeposited on mild steel substrate were produced by electrodeposition method. The structural characteristic of the composite coating was analyzed by scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and atomic force microscope (AFM). Mechanical examination was done using durascan hardness tester. The result showed that the influence of individual particle loading greatly alter the structural properties and hardness behavior. The increase in hardness is attributed to the perfect homogeneity and characteristics of the particulate which led to the formation of uniform distribution, coherent and interfacial precipitation within the zinc lattice

An Investigation of Composite Inclusion Corrosion Resistance Behavior of Thermally Liquid-Melt Inoculated Al-Mg-Si Alloy in Sodium Chloride Medium

Inoculation enhances component performance in corrosive oxidizing environments and this provides appreciated protection in high temperature/stress applications. The corrosion enhancement of Al-Mg-Si alloy in 3.65 % NaCl solution with varying concentrations of titanium composite and minor addition of Sn has been studied using linear potentiodynamic polarization. The mechanical property was examined using the micro-hardness technique. From the results all the alloyed samples exhibited lower decreases in corrosion rate with increases in hardness values as the percent of TiO2 and SnO2 increases up to 10 %wt in the Al-Mg-Si alloy as compared to the as-cast sample. Strengthening efficiencies of 78, 77 and 30 % were obtained at Al/10Ti-Sn, Al/10Ti and Al/5Ti, respectively. The optimum values were obtained at 10 wt%Ti-Sn. The increases in hardness values and corrosion resistance are attributed to the formation of coherent and uniform precipitation in the metallic lattice. These results show that improved corrosion and mechanical properties are achievable by subjecting the cast Al-Mg-Si alloy to inoculation