Effects of Anions on Corrosion Inhibition by Organic Compounds

Hackerman, Norman; Snavely, E.S.; Payne, Jessie

doi:10.1149/1.2424089

Cited by 195 publications

(62 citation statements)

References 8 publications

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“…So, there are electrostatic interactions between negatively charged surface and positively charged atoms, which retard the anodic dissolution of iron (Aramaki et al, 1987). Secondly, according to the donor-acceptor interaction concept , -electrons of the benzene rings and the double bond of the oleate derivative (TN 15 L) in the inhibitor molecules can interact with vacant d-orbital of the metal surface (Hackerman et al, 1966).Thirdly, the polyethylene glycol groups of nonionic chains can adsorb on the metal surface through H-bonding, involving the displacement of water molecules from the metal surface. Lastly, the neutral parts of the molecules can then adsorb, onto metal surface when free surface areas are available.From Table 1, it is seen that at low concentration of the different inhibitors, i.e.…”

Section: Mechanism Of Inhibitionmentioning

confidence: 99%

Performance of nonionic surfactants derived from tannic acid in preventing the acidic dissolution of carbon steel

Negm¹,

Badr²,

Tawfik³

et al. 2014

IOSRJAC

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Section: Mechanism Of Inhibitionmentioning

confidence: 99%

Performance of nonionic surfactants derived from tannic acid in preventing the acidic dissolution of carbon steel

Negm¹,

Badr²,

Tawfik³

et al. 2014

IOSRJAC

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“…. The increasing value of K ads reflects the increasing adsorption capability, due to structural formation, on the metal surface 27,28 . (toward the negative) reflects the increasing adsorption capability 29 .…”

Section: (8)mentioning

confidence: 99%

Synergistic Influence of Propargyl Alcohol and Zinc Sulfate on Inhibition of Corrosion of Aluminum in 0.5M H2so4

Ravari

Dadgareenezhad

2013

J. Chil. Chem. Soc.

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This paper describes the use of the Tafel polarization and electrochemical impedance spectroscopy technique (EIS) in order to study the corrosion inhibition process of aluminum in 0.5M H 2 SO 4 solution in presence of propargyl alcohol and zinc sulfate at the open circuit potential (OCP) in the room temperature. The Nyquist diagrams consisted of a capacitive semicircle at high frequencies followed by a well defined inductive loop at low frequency values. The impedance measurements were interpreted according to a suitable equivalent circuit. The results obtained showed that the addition of the propargyl alcohol inhibits the sulfuric acid corrosion of the aluminum. The inhibition efficiency increases with an increase in the propargyl alcohol concentration. The inhibition occurs through adsorption of the propargyl alcohol on the metal surface without modifying the mechanism of corrosion process. The inhibiting action propargyl alcohol is considerably enhanced by addition of zinc sulfate. Both the inhibitors obeyed the Langmuir isotherm and the thermodynamic calculations revealed that the adsorption of inhibitors was of physical nature.Keywords: Electrochemical Techniques; Corrosion; Aluminum; Zinc Sulfate; INTRODUCTIONAluminum and its alloys find a wide spread spectrum of technological applications because of their particular properties such as low density, good appearance and corrosion resistance. For these reasons, the corrosion behavior of these materials has attracted the attention of several investigators. Acid solutions are used for pickling, chemical and electrochemical etching of aluminum and its alloys. It is very important to add a corrosion inhibitor to decrease the corrosion rate of aluminum and its alloys in such solutions. Several authors [1][2][3][4] have studied the corrosion of aluminum and its alloys and their inhibition by organic inhibitors in acid solutions. The result of the investigations shows that acetylenic compounds are very effective in corrosion inhibition of metal in acid media [5]. Propargyl alcohol (PA) (2-propyn-1-ol) is one of the acetylenic alcohols and its inhibition effect has been discussed extensively [5][6][7][8][9][10] . The decisive role of the triple bonds of the PA molecule due to the π-electrons interacting with the metallic surfaces is generally accepted [11][12][13][14][15] . The adsorption of the inhibitor on the metal surface can markedly change the corrosion-resisting property of the metal 6,7 . The application of electrochemical impedance spectroscopy technique (EIS) as a new tool in corrosion research has resulted in a wealth of information concerning the methods of corrosion protection which were difficult to study with traditional dc techniques. This includes corrosion protection by conversion coatings 8 , polymer coating, and anodic films 9 . EIS has also provided information concerning corrosion protection by inhibitors 10 . In addition to specification of the physical properties of the system, the technique leads to important mechanistic and kinetic i...

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“…Some anions are found to enhance the inhibitive effect of several nitrogen containing organic compounds in acid solutions [14][15][16][17] . In the present paper the influence of SCN -ions on the inhibitive performance of arylazo indole compounds has been studied using weight loss technique.…”

Section: Synergistic Effectmentioning

confidence: 99%

INHIBITION OF CORROSION OF Α-BRASS (Cu-Zn, 67/33) IN HNO3 SOLUTIONS BY SOME ARYLAZO INDOLE DERIVATIVES

FOUDA

MAHFOUZ

2009

J. Chil. Chem. Soc.

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The influence of some arylazo indole derivatives on the corrosion rate of 70/30 α-brass in 2 mol l -1 HNO 3 was investigated using weight loss and galvanostatic polarization techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration, but decreases with increasing the temperature. The adsorption of these compounds on the α-brass surface follows a Frumkin's adsorption isotherm. The electrochemical results indicated that all the investigated compounds act as mixed-type inhibitors. The influence of the substituent group on the inhibition efficiency of the inhibitor was explained in terms of the density of the electron cloud on arylazo indole moiety. Some thermodynamic parameters for corrosion and adsorption processes were determined and discussed.

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Effects of Anions on Corrosion Inhibition by Organic Compounds

Cited by 195 publications

References 8 publications

Performance of nonionic surfactants derived from tannic acid in preventing the acidic dissolution of carbon steel

Performance of nonionic surfactants derived from tannic acid in preventing the acidic dissolution of carbon steel

Synergistic Influence of Propargyl Alcohol and Zinc Sulfate on Inhibition of Corrosion of Aluminum in 0.5M H2so4

INHIBITION OF CORROSION OF Α-BRASS (Cu-Zn, 67/33) IN HNO3 SOLUTIONS BY SOME ARYLAZO INDOLE DERIVATIVES

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