Electrochemical Investigation of the Effect of Process Parameters on the Corrosion Behavior of Aluminum-Cladded Pressure Vessel Steel Using a Friction Stir Diffusion Cladding Process

Abstract

Surface cladding and coatings are commonly used to protect structures against corrosion in corrosive environments. In this paper, electrochemical properties of friction stir diffusion cladded ASTM A516-70 with corrosion-resistant aluminum alloy grade 5052 are studied. The effect of process parameters, tool rotational and traverse speeds on the corrosion behavior of produced cladded steels was comparatively assessed. Electrochemical analyses revealed that the cladded steel sample provided good corrosion protection performance in comparison with the un-cladded steel substrate following an immersion test of up to 21 days in 3.5% NaCl medium. Increasing the tool traverse speed was found to negatively affect the corrosion resistance. Optimum parameters for the selected cladding system were found to be a 500 rpm tool rotational speed, and a 50 mm/min tool traverse speed for protection against general corrosion. Meanwhile, higher traverse speed demonstrated stable passivation behavior and, therefore, lower propensity for pitting localized corrosion. Post characterization of the exposed area indicated that tool shoulder marks were favorable spots for the accumulation of corrosion products.

Electrocapacitive and electrocatalytic performances of hydrochar prepared by one-step hydrothermal carbonization without further activation

“…Since HC-KN has the highest specific capacitance value, Electrochemical Impedance Spectroscopy (EIS) test was examined to further investigate the frequency response of an energy storage device. The Nyquist plot (figure 10(a)) revealed a single semi-circular and linear line with a slope of ∼45°corresponding to the chargetransfer process and the semi-infinite linear mass-transport, respectively.Moreover, incomplete semicircle of HC-KN represent its superior resistance which is the reason why its specific capacitance value is still far away from commercial supercapacitor in global market [54,55]. Furthermore, Bode plots of -phase angle (°) versus log f at −1.0 Hz (figure 10(b)) are observed, a phase angle of ∼57°was obtained for the HC-KN.…”

Analytical Solutions and Case Studies on Stress-Dependent Corrosion in Pressurized Spherical Vessels

“…Regarding the corrosion of pressure vessels, many studies have focused on the specific development process of electrochemistry and the chemistry of metals [13][14][15][16][17][18][19][20]. Furthermore, other researchers do not discuss the chemistry process, and all possible chemical reactions are modeled with the help of certain kinetic phenomenological laws.…”

“…Stress error (difference) between methods 𝑒 σW , 𝑒 σ P , and 𝑑 σ (P,W) . Note: In the figur 𝑒 ℎ P , 𝑒 ℎ G , and 𝑑 ℎ (P,W) meaning see Equation(17).…”

Influence of Waste Material Additives on the Performance of a Novel Hybrid Sol-Gel Coating on Mild Steel in 3.5% NaCl Medium

“…The individual Nyquist spectra of all samples at the two immersion times are also available as Sections S5 and S6 in the Supplementary Materials. EIS is a powerful technique used to characterize the electrical properties of materials and, more commonly, in studying the corrosion of metals and coatings [36][37][38]. At early times of immersion in the saline medium, the samples loaded with the limestone (C-LM) and eggshell (C-EG) showed higher impedance values than those for the parent hybrid coating (Figure 7a,b), which indicates enhanced barrier properties as a result of the modification step with the aforementioned two waste additives.…”