AC and DC studies of the pitting corrosion of Al in perchlorate solutions

Amin, Mohammed A.; Rehim, Sayed S. Abd El; Sherbini, E. E. Foad El

doi:10.1016/j.electacta.2006.01.015

Cited by 41 publications

(13 citation statements)

References 36 publications

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“…Despite the weak adsorption of ClO 4 -ions, there is some evidence from literature [19][20][21] and various studies in our lab [22][23][24][25][26][27][28] proving the occurrence of the pitting corrosion on the surface of some metals and alloys as a result of passivity breakdown by ClO 4 -ions. This means that the adsorption ClO 4 -ions, despite its weakness, has a significant role in passivity breakdown and initiation of pitting corrosion.…”

Section: Effect Of Perchlorate Concentrationmentioning

confidence: 98%

Role of alloyed silicon and some inorganic inhibitors in the inhibition of meta-stable and stable pitting of Al in perchlorate solutions

et al. 2008

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The study of both meta-stable and stable pitting events on the surface of pure Al and three Al-Si alloys, namely (Al + 6%Si), (Al + 12%Si) and (Al + 18%Si) alloys, was carried out in deaerated neutral NaClO 4 solutions of various concentrations (10 -4 -10 -2 M). Measurements were carried out under the effect of various experimental conditions using potentiodynamic anodic polarization and potentiostatic techniques. The results presented below showed that meta-stable pits (appeared as oscillations in current) form at potentials close to the pitting potential (E pit ) and during the induction time for stable pit formation. Various factors affecting the rate of meta-stable and stable pits were studied. The presence of Si as an alloying element in Al reduces the rate of formation of meta-stable pits, corresponding to a reduction in the probability of developing stable pits, and an increase in the pitting potential results. The inhibitive effects of chromate, silicate, molybdate and tungstate on pitting corrosion in Al were also studied. Results obtained showed that these known inhibitors retard both meta-stable and stable pitting events. This makes attainment of stable pit growth more difficult in presence of these inhibitors.

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Section: Effect Of Perchlorate Concentrationmentioning

confidence: 98%

Role of alloyed silicon and some inorganic inhibitors in the inhibition of meta-stable and stable pitting of Al in perchlorate solutions

et al. 2008

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“…Figure 2 shows that the current density in the passive region is in the range of 30-90 µA/cm 2 , while the passive current density for most metals with a tenacious passive film on the surface is 1-10 µA/cm 2 . 20,22,25 This result again shows that the passive film is defective. It may also be noted that the phase angle decreases significantly toward lower values at low frequency region, indicating that the impedance acts like a pure resistance of the surface film.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 68%

“…When the potential is reversely scanned, the current density shows a continuous and small increase, typical of an autocatalytic character of pitting corrosion. 22 Our previous study detected the occurrence of corrosion pits. 23 After that, the current density begins to decrease and forms a hysteresis loop.…”

Section: Cyclic Voltammetry Curvesmentioning

confidence: 99%

Influence of Water on Passivation of Zr in n-butanol Solution Containing Bu<sup>n</sup><sub>4</sub>NBr

et al. 2018

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To understand the role of water on zirconium passivation in n-butanol solutions containing Bu n 4 NBr, composition and corrosion properties of the passive film were studied using cyclic voltammetry, X-ray photoelectron and electrochemical impedance spectroscopy. Zirconium undergoes spontaneous passivation followed by pitting corrosion as a result of passivity breakdown by the aggressive attack of bromide anions. The passive film consists mainly of ZrO 2 , ZrO 2 ·2H 2 O and a small amount of zirconium butoxide. The pitting potential shifts positively and pitting corrosion is seriously inhibited with the addition of a small amount of water. Water improves the pitting corrosion resistance of the passive film by changing the thickness and the relative ratio of OH − /O 2− . The result is helpful to electrosynthesize zirconium butoxide with high energy efficiency.

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“…Mohammed et al compared impedance results at different potentials. Their results showed that at a potential more negative than the pitting potential, a charge-transfer semicircle was obtained, and this semicircle was followed by a Warburg diffusion tail at a potential more positive than the pitting potential [3]. It showed the information before and after the pitting process, but it did not give the dynamic information about pitting corrosion.…”

Section: Introductionmentioning

confidence: 93%

Study on pitting process of 316L stainless steel by means of staircase potential electrochemical impedance spectroscopy

Jia

et al. 2011

Int J Miner Metall Mater

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Pitting corrosion of 316L stainless steel in NaCl solution was investigated by means of staircase potential electrochemical impedance spectroscopy (SPEIS). The investigation focused on the transition of stainless steel from the passive state to pitting corrosion. Based on the evolution of electrical parameters of the equivalent electrical circuit, it is suggested that the most probable mechanism of pit creation is the film breaking model. The result demonstrates that staircase potential electrochemical impedance spectroscopy is an effective method for the investigation of pitting corrosion.

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AC and DC studies of the pitting corrosion of Al in perchlorate solutions

Cited by 41 publications

References 36 publications

Role of alloyed silicon and some inorganic inhibitors in the inhibition of meta-stable and stable pitting of Al in perchlorate solutions

Role of alloyed silicon and some inorganic inhibitors in the inhibition of meta-stable and stable pitting of Al in perchlorate solutions

Influence of Water on Passivation of Zr in n-butanol Solution Containing Bu<sup>n</sup><sub>4</sub>NBr

Study on pitting process of 316L stainless steel by means of staircase potential electrochemical impedance spectroscopy

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