Effect of variation of the structure of amino acids on inhibition of the corrosion of low-alloy steel in ammoniated citric acid solutions

被引：17
作者：
Abdel-Fatah, Hesham T. M. [1 ,2 ]
Abdel-Samad, Hesham S. [3 ,4 ]
Hassan, Aliaa A. M. [5 ]
El-Sehiety, Hala E. E. [1 ]
机构：
[1] Egyptian Elect Holding Co, Cent Chem Labs, Cairo, Egypt
[2] Higher Technol Inst, Tenth Of Ramadan City, Egypt
[3] Ain Shams Univ, Fac Sci, Dept Chem, Cairo, Egypt
[4] Taibah Univ, Dept Basic Sci, Community Coll, Medina, Saudi Arabia
[5] Jazan Univ, Fac Sci & Arts Al Ardha, Al Ardha, Jazan, Saudi Arabia
来源：
RESEARCH ON CHEMICAL INTERMEDIATES | 2014年 / 40卷 / 04期
关键词：
Corrosion inhibition; Acid cleaning; Amino acids; Potentiodynamic polarization; EIS; EFM; ELECTROCHEMICAL FREQUENCY-MODULATION; M SULFURIC-ACID; MILD-STEEL; HYDROCHLORIC-ACID; H2SO4; SOLUTION; CARBON-STEEL; ADSORPTION; IRON; BEHAVIOR; MEDIA;
D O I：
10.1007/s11164-013-1073-8
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Potentiodynamic polarization, electrochemical impedance spectroscopy, and the new technique electrochemical frequency modulation were used to study the effect of the different structures of three amino acids (tryptophan, tyrosine, and serine) on inhibition of the corrosion of ASTM A213 grade T22 low-alloy steel in ammoniated citric acid solutions. The effects on corrosion inhibition of inhibitor concentration, temperature, and stirring velocity were studied. Thermodynamic data for corrosion and adsorption were calculated and are discussed. The results obtained from the different techniques reveal that the efficiency of inhibition follows the sequence: tryptophan > tyrosine > serine. Inhibition occurs as a result of adsorption of inhibitor molecules by the alloy surface. Adsorption of the inhibitors is a good fit with the Temkin isotherm model.
引用
收藏
页码：1675 / 1690
页数：16
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