In the present study, two inhibitors, benzomidazole and methyl benzomidazole, were used to prevent corrosion of X70 micro-alloy steel in acidic environment in one molar of sulfuric acid. For this purpose, both inhibitors in different concentrations were investigated in More
In the present study, two inhibitors, benzomidazole and methyl benzomidazole, were used to prevent corrosion of X70 micro-alloy steel in acidic environment in one molar of sulfuric acid. For this purpose, both inhibitors in different concentrations were investigated in order to find the best concentration, temperature and efficiency of weight loss tests, polarization and electrochemical impedance spectroscopy (EIS). The chemical composition of the sample was obtained by quantum test and the sample with dimensions of 100 × 50 × 10 mm was prepared in 20 pieces. Corrosion protection performance of inhibitors in 1 M sulfuric acid solution for weight loss test after 10 days of immersion and also in polarization and impedance tests using Auto Lab and Nova1.11 software were evaluated. . As a result, the best inhibitory efficiency of benzomidazole at a concentration of 600 ppm was equal to 37% and methyl benzomidazole at a concentration of 400 ppm equal to 30%, and in the combined state of these two solutions have the ability to increase corrosion efficiency up to 73%. As a result, both of these inhibitors showed practical ability to be used in industrial environments.
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In this paper, the effect of tool rotation speed on the mechanical properties and corrosion behavior on dissimilar joints Friction Stir Welds between 5083 Aluminium alloy and pure Titanium is investigated. At first, with primary welding parameters range necessary to ach More
In this paper, the effect of tool rotation speed on the mechanical properties and corrosion behavior on dissimilar joints Friction Stir Welds between 5083 Aluminium alloy and pure Titanium is investigated. At first, with primary welding parameters range necessary to achieve suitable connection obtained and then by changing tool rotation speed, mechanical and corrosion properties of heat affected zones, welding zones and cross section zones, by using polarization Tafel test and Electrochemical Impedance Spectroscopy was investigated and the result were compared. the result indicates that corrosion behavior of connections, is impressionable of the tool rotation speed and welding zone and heat affected zones have weaker corrosion resistance compared to the base metals.
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Abstract In the present study, the effect of different cooling rate on microstructure and corrosion behavior of Mg-5Zn-1Y-0.1Ca biomedical alloy are investigated. Microstructure observations using optical and scanning electron microscopes showed that the alloy contains More
Abstract In the present study, the effect of different cooling rate on microstructure and corrosion behavior of Mg-5Zn-1Y-0.1Ca biomedical alloy are investigated. Microstructure observations using optical and scanning electron microscopes showed that the alloy contains α-Mg as the matrix, and Mg3YZn6 and Ca2Mg6Zn3 intermetallic precipitations, having lamellar morphology formed mostly at the grain boundaries. Also microstructure results showed that with increasing cooling rate, the continuity of precipitations increase in grain boundary and inter dendritic zones. The polarization test, as well as the immersion result, confirmed that increasing the cooling rate does not always improve the corrosion properties, and it seems there is an optimal cooling rate resulting in minimum corrosion rate. Abstract: In the present study, the effect of different cooling rate on microstructure and corrosion behavior of Mg-5Zn-1Y-0.1Ca biomedical alloy are investigated. Microstructure observations using optical and scanning electron microscopes showed that the alloy contains α-Mg as the matrix, and Mg3YZn6 and Ca2Mg6Zn3 intermetallic precipitations, having lamellar morphology formed mostly at the grain boundaries. Also mi
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In the present study, the effect of friction stir welding (FSW) on the corrosion behavior of pure copper in 3.5 % wt NaCl solution was investigated. For this purpose, pure copper was welded using a rotation speed of 355 rpm and welding speed of 20, 28, and 40 mm/min. Th More
In the present study, the effect of friction stir welding (FSW) on the corrosion behavior of pure copper in 3.5 % wt NaCl solution was investigated. For this purpose, pure copper was welded using a rotation speed of 355 rpm and welding speed of 20, 28, and 40 mm/min. The microstructures of the pure copper and welded pure copper were evaluated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Also, corrosion behavior of the specimens was investigated using Tafel polarization, and electrochemical impedance spectroscopy (EIS) in 3.5 % wt NaCl solution. Results revealed that FSW decreased the grain size of pure copper and improved the corrosion resistance of the stir zone.
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