Abstract
Thin films of Magnetite have been deposited on Galvanized Steel (G-S) alloy using RF-reactive magnetron sputtering technique and protection efficiency of the corrosion of G-S. A Three-Electrodes Cell was used in saline water (3.5 % NaCl) solution at different temperatures (298, 308, 318 & 328K) using potentiostatic techniques with. Electrochemical Impedance Spectroscopy (EIS) and fitting impedance data via Frequency Response Analysis (FRA) were applied to G-S alloy with Fe3O4 and tested in 3.5 % NaCl solution at 298K.Results taken from Nyquist and Bode plots were analyzed using software provided with the instrument. The results obtained show that the rate of corrosion of G.S alloy increased with increasing the temperatures from 298 to 323K; and showed that deposition of Fe3O4 caused protection efficiency to reach 79.76% for G-S in 318K. In addition the enthalpy & entropy of activation were evaluated. Apparent energies of activation have been calculated for the corrosion process of uncoated and coated G.S alloy by sputtering technique in saline water (3.5 % NaCl). The morphological analysis was carried out using Scanning Electron Microscopy (SEM) technique.
Highlights
Corrosion can be defined as the chemical or electrochemical reaction when a material is exposed to an environment that causes the subsequent deterioration of the material
This paper reports, the results of an investigation of corrosion resistance of nanostructure deposited used RF
Materials and Methods: The chemical composition of Galvanized Steel (G-S) composites are given in Table1.Other chemicals include iron oxide NPs, magnetite Fe3O4 [30-40] nm USA with purity 99.8%, acetone, and ethanol were purchased from BDH with purity not less than 99%.Samples of galvanized steel were cut into circles with a diameter of 2.5 cm and 1.5 mm thickness and ground until mirror like surfaces was achieved using a series of grits of increasing fineness up to 2000
Summary
Corrosion can be defined as the chemical or electrochemical reaction when a material is exposed to an environment that causes the subsequent deterioration of the material. Galvanized steel involves aZinc (Zn) coating on steel to prevent an underlying steel substrate from rusting. It was found that soft water, tropical sea water, and high oxygen content caused higher corrosion in a Zn coating of galvanized steel [2]. Galvanized steel is used in aqueous environments in many indoor and outdoor applications where rust resistance is needed. It is used in applications such as under sea water, underground pipelines, frames to build houses, household appliances,
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