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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 52, Number 2
JKCSEZ 52(2)
April 20, 2008 

 
Title
The Inhibition of C-steel Corrosion in H3PO4 Solution by Some Furfural Hydrazone Derivatives

The Inhibition of C-steel Corrosion in H3PO4 Solution by Some Furfural Hydrazone Derivatives
Author
A. S. Fouda*, G. E. Badr, M. N. El-Haddad

A. S. Fouda*, G. E. Badr, M. N. El-Haddad
Keywords
H3PO4, 부식, 탄소강, Furfural Hydrazone 유도체들 , H3PO4, Corrosion, C-steel, Furfural Hydrazone Derivatives
Abstract
3M H3SO4(M: 몰농도) 용액에서 탄소강의 부식방지제로 Furfural hydrazone 유도체의 효과를 질량손실법 및 정전류극성법을 사용해 연구하였다. 이들 유도체 존재하에서 탄소강의 부식속도가 급격히 감소함을 관찰하였다. 이 연구로부터 부식방지효율은 부식방지제 농도가 증가함에 따라 증가하였고 I?와 SCN?을 첨가하면 부식방지효율은 더욱 증가되었다. 질량손실법을 사용해 5×10-6 M의 유도체가 있을 때와 없을 때 30-60℃ 사이에서 탄소강 부식에 미치는 온도 효과를 보았다. 부식과정에 대한 활성화에너지(Ea*)와 다른 열역학적 변수들을 계산하였고 이들에 대해 논의하였다. 정전류극성법을 통해 유도체들이 혼합형 방지제로 작용함을 알았고 외부전류를 흘려주었을 때 음극은 더욱 분극되었다. 3M H3SO4 용액에서 탄소강 표면에 이들 유도체들의 흡착은 Frumkin의 흡착등온을 따랐다. 이들 유도체들의 화학구조 를 통해 부식방지 메커니즘을 설명하였다.

The effect of some furfural hydrazone derivatives (I -V) as corrosion inhibitors for C-steel in 3M H3PO4 solution in which M indicates mol/l has been studied using weight-loss and galvanostatic polarization techniques. A significant decrease in the corrosion rate of C-steel was observed in the presence of the investigated compounds. This study revealed that, the inhibition efficiency increases with increasing the inhibitor concentration, and the addition of iodide and thiocynate ions enhances it to a considerable extent. The effect of temperature on the corrosion behavior of C-steel was studied in the range from 30-60℃ with and without 5×10-6 M investigated compounds using weight-loss method. Apparent activation corrosion energy (Ea*) and other thermodynamic parameters for the corrosion process were calculated and discussed. The polarization measurements show that the investigated compounds act as mixed-type inhibitors, but the cathode is more polarized when an external current was applied. The adsorption of these compounds on the surface of C-steel in 3M H3PO4 obeys Frumkin’s adsorption isotherm. The mechanism of inhibition was discussed in the light of the chemical structure of the investigated compounds.

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