Inhibition of Aluminum 7075 Alloy Corrosion by the Concerted Action of Nitrate and Oxalate Salts

Lyberatos, G.; Kobotiatis, L.

doi:10.5006/1.3585856

Cited by 49 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, barley extract could be used as an inhibitor to reduce the rate of acid corrosion of steel in high-temperature pickling baths, and this result was confirmed by the optical micrographic results. The extract was classified as a mixed type and pickling inhibitor (Lyberatos and Kobotiatis, 1991), as is suggested by the unchanged corrosion potential values. The slight variations in the values of Tafel slopes, ␤ a and ␤ c , indicate that the inhibiting action takes place by simple blocking of the available cathodic and anodic sites of the metal surface (Abdel-Gaber et al, Corrosion Science, 2006a;Abdel-Gaber et al, Corrosion, 2006b).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

An important world crop – barley – as a new green inhibitor for acid corrosion of steel

Saadawy

2015

Anti-Corrosion Methods and Materials

View full text Add to dashboard Cite

Purpose -The purpose of this paper was to test the extract of barley as an environmentally friendly inhibitor for the acid corrosion of steel due to its wide availability as a popular major crop and its richness with different chemical constituents reported in literature (40) like alanine, glycine, serine, aspartic acid, leucine, valine, tyrosine and isoleucine with various number of functional groups that are able to chelate metal cations and to discuss the effect of temperature on its inhibition efficiency. Design/methodology/approach -Electrochemical impedance spectroscopy (EIS) and polarization measurements were carried out using frequency response analyzer Gill AC instrument. The frequency range for EIS measurements was 0.1 Յ f Յ 1 ϫ 103 with an applied potential signal amplitude of 10 mV around the rest potential. Polarization measurements were carried out at a scan rate of 30 mV/min, utilizing a three-electrode cell. A platinum sheet and saturated calomel electrode were used as counter and reference electrodes, respectively. The working electrode was constructed with steel specimens that have the following composition (weight per cent): C, 0.21; S, 0.04; Mn, 2.5; P, 0.04; Si, 0.35; and balance Fe. Findings -Barley extract could act as an effective corrosion inhibitor for the acid corrosion of steel. The inhibiting action of the barley extract was attributed to its adsorption over the metal surface that blocks the available cathodic and anodic sites. Adsorption isotherms indicated that the adsorbed extract molecules cover one active center over the metal surface. Originality/value -The research included the first use of an important world crop as an effective corrosion inhibitor that can reduce the corrosion of steel to an extent of 94 per cent.

show abstract

Section: Discussionmentioning

confidence: 99%

“…It has been pointed out by a number of authors (Lyberatos and Kobotiatis, 1991;Abd El-Rehim et al, 1999;Putilova et al, 1960) that the logarithm of the corrosion rate (k) is a linear function with the reciprocal of the absolute temperature 1/T (Arrhenius equation):…”

Section: Anti-corrosion Methods and Materialsmentioning

confidence: 99%

An important world crop – barley – as a new green inhibitor for acid corrosion of steel

Saadawy

2015

Anti-Corrosion Methods and Materials

View full text Add to dashboard Cite

show abstract

“…The linear plot obtained in Fig. (9) indicates that the adsorbing HEC species occupies typical adsorption site at the metal/solution interface [33]. In general, K, the equilibrium adsorption constant, represents the adsorption power or binding strength of the inhibitor molecule on the metal surface.…”

Section: Adsorption Considerationmentioning

confidence: 97%

Experimental and Theoretical Studies of Hydroxyethyl Cellulose as Inhibitor for Acid Corrosion Inhibition of Mild Steel and Aluminium

Arukalam¹,

Madufor²,

Ogbobe³

et al. 2014

TOCORRJ

View full text Add to dashboard Cite

Hydroxyethyl cellulose (HEC) was studied as corrosion inhibitor for mild steel and aluminium in 0.5 M H 2 SO 4 solution using weight loss and electrochemical techniques. The results revealed that HEC inhibited corrosion of mild steel and aluminium in sulphuric acid environment. Inhibition efficiency was found to depend on concentration of the inhibitor. Impedance results revealed that HEC was adsorbed on the corroding metal surface while polarization results show that HEC inhibited both anodic and cathodic reactions of mild steel but showed anodic dissolution reaction on aluminium due to destabilization of the passive oxide film on the Al surface and inhibited only cathodic reaction. Inhibition of corrosion reaction in the acidic medium by adsorption on the metal/solution interface follows Langmuir and Freundlich adsorption isotherms. Also, inhibition efficiency increased with rise in temperature. Local reactivity of the HEC molecule was analyzed theoretically using the density functional theory. The theoretical predictions showed good agreement with experimental results.

show abstract

“…The displayed data shows that, in H 2 SO 4 , the presence of plant extract decreases the corrosion current density (i corr ) and shifts the corrosion potential (E corr ) to low negative values. On the other hand, the presence of o-phenanthroline slightly affects the values of corrosion potential (E corr ) indicating that it could act as a pickling inhibitor [64]. Moreover, in the presence of o-phenanthroline, the anodic and cathodic Tafel slopes (b a and b c ) are slightly changed suggesting that the inhibiting action occurred by the simple blocking of the available cathodic and anodic sites on the metal surface, while the anodic Tafel slopes (b a ) have lower numerical values in the presence of C. fistula L. pods extract suggesting that the inhibiting action of the extract takes place by controlling the anodic processes.…”

Section: Synergism Mechanismmentioning

confidence: 98%

Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions

Nemr

El‐Said

Khaled

et al. 2014

Desalination and Water Treatment

View full text Add to dashboard Cite

2014) Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions, Desalination and Water Treatment, 52:28-30, 5187-5198, A B S T R A C T The corrosion inhibition of water extract of Cassia fistula L. pods and o-phenanthroline on mild steel in acid solution in the absence and presence of 0.1 M NaCl have been investigated using weight loss measurements in addition to the potentiodynamic polarization technique. FTIR and GC-mass were used to identify the chemical composition of C. fistula L. pods. The inhibition efficiencies of C. fistula L. pods were 95.19% in 2 M H 2 SO 4 and 86.13% in 0.5 M nitric acid solutions in the presence of chloride ions, while o-phenanthroline recorded 86.09and 72.76% for the above acid solutions, respectively. All the DG ads were negative which indicates spontaneous adsorption on the steel surface. Consequently the relationship between log (c/0) and log c indicates that the adsorption of inhibitor onto steel surface follows the Langmuir adsorption isotherm.

show abstract

Inhibition of Aluminum 7075 Alloy Corrosion by the Concerted Action of Nitrate and Oxalate Salts

Cited by 49 publications

References 0 publications

An important world crop – barley – as a new green inhibitor for acid corrosion of steel

An important world crop – barley – as a new green inhibitor for acid corrosion of steel

Experimental and Theoretical Studies of Hydroxyethyl Cellulose as Inhibitor for Acid Corrosion Inhibition of Mild Steel and Aluminium

Differences in the corrosion inhibition of water extracts of Cassia fistula L. pods and o-phenanthroline on steel in acidic solutions in the presence and absence of chloride ions

Contact Info

Product

Resources

About