A newly synthesized sulphated 8-hydroxyquinoline derivative to effectively control aluminum corrosion in perchloric acid: Electrochemical and positron annihilation studies

Use of alumina sludge arising from an electrocoagulation process as functional mesoporous microcapsules for active corrosion protection of aluminum

“…Figure 13B). Such behaviour was expected on the basis of the chelating characteristics of this compound towards aluminum ions reported in the literature [44,[47][48][49][50]. Furthermore, it should be noticed that superior performances were always attained for any elapsed time compared to the first EIS data recorded immediately following exposure to the test solution.…”

“…These organic compounds are currently investigated for the corrosion inhibition of aluminum alloys when present either in the aqueous solution [35][36][37][38][39][40][41], or encapsulated in reservoirs and added to coatings for corrosion protection [42][43][44][45][46], although each one provides significantly different performances. Thus, high corrosion inhibition efficiencies have been observed for 8HQ on aluminum due to the formation of an insoluble chelate layer of aluminum 8-hydroxyquinolinate [44,[47][48][49][50], whereas BTA is less efficient towards the protection of this metal unless a complete although thin BTA-based layer were formed on the surface [36]. Due to the electrochemical nature of the corrosion processes occurring on metals exposed to aqueous environments, electrochemical impedance spectroscopy (EIS) [51][52][53][54][55] was used to monitor the corrosion resistance of the metal/coating system.…”

Investigating the potential of casein as a sustainable material in inhibiting the corrosion of aluminum in hydrochloric acid

“…The Tafel extrapolation method was utilized to determine the potential at which the cathodic and anodic reaction equalize (i.e., corrosion potential; E corr ), the current produced during the corrosion phenomena per unit area (i.e., corrosion current density; i corr ) and the Tafel slopes ( β a , β c ) which reveal the relationship between the electrode potential and the current produced in an electrochemical cell (Table 4). In addition, the calculated corrosion current densities and the Tafel slopes were employed to determine the variations in the polarization resistance of the AA1060 coupons ( R p ) in the absence and presence of casein (Equation ) [ 44 ] $$${R}_{{\rm{P}}}=\frac{({\beta }_{{\rm{a}}}\times {\beta }_{{\rm{c}}})}{2.303\times {i}_{\mathrm{corr}}\times ({\beta }_{{\rm{a}}}+{\beta }_{{\rm{c}}})}.$$$…”