Effect of Alkaline Etching on the Inhibition of the Acidic Corrosion of Aluminum by Lupine Extract

Abstract

The inhibitive effect of Lupine extract on the corrosion of etched and non-etched aluminum in aqueous solution of 0.1 M HCl was investigated at 30 ºC by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and optical microscopic techniques. Potentiodynamic polarization curves indicated that Lupine extract acts as anodic type inhibitor. EIS measurements showed that the charge transfer resistance and consequently the inhibition efficiency increase with increasing concentration of Lupine. The experimental data indicated that Lupine is more efficient as inhibitor for the acid corrosion of non-etched aluminum. The inhibitive effect of the extract was assumed to occur via adsorption of active ingredients of the extract on the metal surface. Theoretical fitting of the data to the Kinetic-thermodynamic model were tested to clarify the nature of adsorption. The optical micrographs obtained after surface pre-treatment show that alkaline etching reveals the surface to be porous-like in structure and both the acid and extract have limited effect on the size of pores.

Electrochemical synthesis and characterizations of new nanocomposite electrodeposition on Co67Cr29W4 alloy substrate

“…From Figure 7b it can be seen the morphology of PNEA coating was like to the globular structure with a growth of aggregates shaped as spherical grains. 9,[25][26][27][28][29][30][31][32] It can be remarked from Figure 7 c-d that the PPY-AOT/PNEA composite displayed that a uniform form of cauliflower structure with a small globulous microstructure ascribed adherent and compact over the Co67Cr29W4 alloy surface has been determined, which is comparable with the literature. The SEM image of the PPY-AOT/PNEA composite film deposited on Co67Cr29W4 alloy is homogeneous, powerful adherent over the Co67Cr29W4 alloy surface and the feature of the composite is so excellent.…”

Assessment of theBassia muricataextract as a green corrosion inhibitor for aluminum in acidic solution

“…The photochemical (involves flavonoids and alkaloids) which represent in the plant extract involves hetero atoms such as N, S, O, aromatic ring and π-electrons, through which they will be adsorbed on the metal surface and mitigate corrosion process (12). Newly, the most of the plant extracts have been confirmed to be good inhibitors for aluminum acidic corrosion (13)(14)(15). So they are applied in order to resolve the corrosion problem associated without any environmental problems.…”

PVA–FeCl3 composites as substrate and packaging materials for the controlled degradation of non-degradable metals in transient electronics

“…† During this dissolution process, the reported degradation products are soluble aluminum complexes with chloride ions. 39 Besides encapsulant, PVA-FeCl 3 composite lms were also utilized as substrates for transient electronics. In transient electronics, it is pretty common to deposit conductive materials, both organic and inorganic, directly on either water-soluble or biodegradable polymers to develop transient current collectors.…”