Experimental and theoretical investigation on corrosion inhibitive properties of steel rebar by a newly designed environmentally friendly inhibitor formula

Abstract

A new corrosion inhibitor formula was designed and the inhibitive mechanism was analyzed based on HSAB theory and the PDM model.

Adsorption and Inhibition Analysis of Aconitine and Tubocurarine Alkaloids as Eco-friendly Inhibitors of Pitting Corrosion in ASTM – A47 Low Carbon Steel in HCl Acid Environment

“…In contrary to the result of the corrosion rate of metal at ambient temperature in the gravimetric analysis, the gasometric analysis showed increased corrosion rate and a slight decrease in inhibition efficiency as the temperature was increased accordingly. This is due to the high-temperature effects that bring about agitation and desorption of weakly bounded inhibitor molecules held on the low carbon steel surface by van der Waals forces of attraction rather than ionic bonding [13,22,[27][28][29][30]. This can also be possible because of the migration of segments of molecules or individual molecules (inhibitors) in jumps, from one place in a site to a vacant hole of the site [17,25,31].…”

“…The double-layer capacitance found decreases with increasing inhibitor concentration, and inhibition efficiency increases with the concentration increment. This proved strong adsorption of the inhibitor molecules on the metal surface due to the flow type and flow rate of the inhibitors [28][29][30][36][37][38][39][40]. It can also be said that the strong adsorption help the system to overcome electron transfer from the positive electrode (anodic site) to the hydrogen ions in the solution phase and subsequent reduction in cathodic hydrogen gas evolution, hence blocking the corrosion reaction [15,27,[39][40][41][42][43][44][45].…”

“…Generally, it was observed from Table 7-10 that the correlation coefficient values for the isotherms were approximately unity when fitted to the isotherms, and their isotherm equilibrium binding constants were decreasing with temperature. This implies that both isotherms were obeyed, and a physical adsorption process was eminent [14][15][16][17][18][21][22][23][24][25][26][27][28][29][30]39]. However, the Langmuir isotherm was very well obeyed comparatively.…”

Analysis on physical and mechanical performance and damage mechanism of steel strand under coupling effects of load and environment

“…The corrosion weight loss rate P w of specimens can be used to assess the corrosion damage degree of steel strands intuitively after the coupling effects of load and environment . To study the influence of corrosion time to the physical and mechanical performance of the steel strands, we compare and analyze group 1–16 with each other, and guarantee the parameters of every specimen are the same except the corrosion time under different working conditions.…”

Halogeno-substituted indazoles against copper corrosion in industrial pickling process: a combined electrochemical, morphological and theoretical approach

“…This implies that the coordination bond could form through HOMO of the inhibitors to unlled sp 3 non-equivalent hybrid orbital of Cu (electrondonation) and the transfer of electrons from the 3d-orbital of Cu to the vacant orbital of inhibitor molecules (antibonding). 49,50 Importantly, the parallel adsorption conguration can control the aggressive attack availably by minimizing the contact area between Cu and corrosive particles. Generally, organic molecules adsorb on a metal surface blocking the cathodic and anodic sites.…”