The corrosion inhibiting property of 4-methylquinoline (4MQ) and 4-aminoquinaldine (4A2MQ) by
using various quantum mechanical and molecular mechanics parameters such as EHOMO, ELUMO, energy
difference (ΔEgap), electrophilicity, nucleophilicity, chemical hardness, chemical softness, adsorption
energy on the metal surface, ability of back donation, electron affinity, chemical potential and dipole
moment values are studied. Density functional studies were carried out using B3LYP/6-31g++(d,p),
B3LYP/6-31g(d,p) and B3LYP/6-31g(d) basis sets. The outputs of the compounds were compared as
well as the characteristics of the Fukui functions used to analyze them. The adsorption energy values
were obtained using Monte Carlo simulation techniques. The adsorption energy calculations were
carried out by using COMPASS force field and adsorption annealing methods. These calculated values
had good agreement with previously reported values of these corrosion inhibitors. Comparing the
combined dual descriptor values of 4MQ and 4A2MQ reveal that the latter compound readily undergoes
electrophilic attack, leading to the enhanced corrosion inhibition. The efficiency of these corrosion
inhibitors compounds by various studies was compared and the result shows that 4A2MQ can be
better corrosion inhibitor than 4MQ.
The density, viscosity and sound velocity of five Schiff bases (1-5) derivatives in DMSO solutions have been studied at 303.15 K over a wide range of concentration. From these experimental data, some acoustical parameters such as Molar volume (Vm
In this analysis, corrosion efficiency and mechanical properties of duplex stainless steel castings (DSS-4A and DSS-5A) were compared to their wrought counterparts. Cast duplex stainless steel DSS-4A and DSS-5A are characterized in two separate solution treated settings, while their wrought counterparts are characterized in both solutions treated and forged form. Optical microscopy and X-ray diffractometry were employed to perform the metallurgical characterization. Electrochemical techniques such as Tafel extrapolation and electrochemical impedance spectroscopy were used to investigate corrosion activity. An electrochemical workstation was used to perform the corrosion studies. To compare the stability and changes in corrosion properties of both grades, an ASTM standard B117 salt spray test was performed in a 3.5 percent NaCl medium. Without any intermetallic phases, the XRD showed austenite and ferrite phases. The elements were partitioned further into the phases that they promoted, according to the elemental study of the phases. The ultimate tensile strength and hardness values of DSS-5A are higher than those of DSS-4A. DSS-5A had a higher corrosion resistance than DSS-4A. When comparing the two media used (H2SO4 and NaCl), DSS-5A demonstrated superior corrosion resistance.
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