Papers by Keyword: Corrosion Inhibitor

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Authors: Xue Dan Chen, Min Gong, Qing Shan Fu, Xing Wen Zheng, Xue Song Feng
Abstract: The corrosion inhibition effect of the 1-alkyl-3-methylimidazolium proline ([Omi [Pro]) for copper in 3.5% NaCl solution was investigated by using electrochemical methods. The results indicated that: the inhibition efficiency of [Omi [Pro] was more than 90%, which showed the excellent corrosion inhibition performance. The inhibition efficiency increased with increasing concentration of [Omi [Pro], and decreased with increasing temperature, but it changed very little when the concentration arrived at 0.001 mol/L. [Omi [Pro] was a good mixed-type inhibitor which mainly inhibited anodic processes.
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Authors: Xu Yang, Fu Sheng Pan, Ding Fei Zhang
Abstract: With the aim of evaluating corrosion inhibition for various inhibitors, a new qualitative method for corrosion inhibition effect test for magnesium and magnesium alloys was developed. The change of polarization current density of AZ61 magnesium alloy in electrochemical polarization experiments in alkali aqueous solution with 5mmol/L sodium dodecylsulphate(SDS), phytic acid(PA), ethylenediamine tetraacetic acid(EDTA), p-nitro-benzene-azo-resorcinol(PNBAR), acidum tannicum(AT) or stearic acid(SA) were tested. The SEM-EDS techniques and deposition experiment method were used for further confirmation of the corrosion inhibition. The results showed that those organic compounds which could form the inhibitor-magnesium precipitation in aqueous solution could be used as corrosion inhibitors for magnesium alloys to inhibit the increase of polarization current density as well as the dissolution and oxidation of magnesium alloys effectively.
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Authors: Xiu Lan Zhang, Xiao Lin, Bin Xie, Li Ke Zou, Sha Sha Zhu, Yan Lu, Jian Shen Feng, Yu Long Li
Abstract: The corrosion inhibition of S-benzyl o-phenylenedioxydithiophosphate (BPOTP), for carbon steel in hydrochloric acid solution was studied by electrochemical measurements and weight loss measurements. Polarization curves indicate BPOTP is a mixed-type inhibitor, and the effects of temperature, hydrochloric acid concentration and immersion time were also studied. The studies of weight loss measurement show that the inhibition efficiency was up to 92.82 % at the BPOTP concentration of 40 mg·L-1 in 1.0 M hydrochloric acid solution at 30°C. The adsorption of BPOTP on carbon steel surface obeys the Langmuir isotherm.
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Authors: Yan Lu, Sha Sha Zhu, Bin Xie, Chuan Lai, Qin Huan Yang, Lin Xin He, Yu Long Li, Li Ke Zou
Abstract: The corrosion inhibition of S-benzyl-O,O'-dibenzyldithiophosphate (BBP) for carbon steel in hydrochloric acid solution was studied by electrochemical measurements and weight loss measurements. Polarization curves indicate BBP is a mixed-type inhibitor, and the effects of temperature, hydrochloric acid concentration and immersion time were also studied. The studies of weight loss measurement show that the inhibition efficiency was up to 97.39 % at the BBP concentration of 60 mg·L-1 in 1.0 M hydrochloric acid solution at 30°C. The adsorption of BBP on carbon steel surface obeys the Langmuir isotherm.
295
Authors: Tao Wang, Xi Yang He, Xue Yang
Abstract: The weight loss measurements and potentiodynamic polarization techniques are used to assess the inhibitive and adsorption behaviour of 2-Benzothiazolethiol (BTT) for Q235 steel in hydrochloric acid solution. The inhibition efficiency is found to increase with increase in BTT concentration but decrease with rise in temperature and hydrochloric acid concentration. The results show that BTT acts as a good corrosion inhibitor in hydrochloric acid solution. Adsorption of BTT is found to obey Langmuir isotherm. Polarization curves indicate BTT is a mixed-type inhibitor.
947
Authors: Li Ke Zou, Chuan Lai, Bin Xie, Xue Yang, Zhen Xiang, Ni Zeng, Chun Huang, Yang Mei Wang
Abstract: The inhibition effect of N,N-diethylammonium O,O'-di(2-phenylethyl)dithiophosphate (EPP, [NH2(Et)2][S2P(OCH2CH2Ph)2]2) against the corrosion of Q235 steel in H2SO4 solution was studied by weight loss measurement, potentiodynamic polarization and SEM(scanning electron microscope) techniques. The results show that EPP acts as an excellent corrosion inhibitor in 5% H2SO4 by suppressing simultaneously the cathodic and anodic processes via chemical adsorption on Q235 steel surface, which complies with the Langmuir adsorption isotherm. Polarization curves indicate EPP is a mixed-type inhibitor. The effects of temperature, acid concentration and immersion time were also studied.
2923
Authors: Bin Xie, Chuan Lai, Li Ke Zou, Xiang Mei Zeng, Chun Huang, Ni Zeng, Yan Mei Wang
Abstract: The inhibition effect of N,N-diethylammonium O,O'-dicyclohexyldithiophosphate(NOCP) against the corrosion of carbon steel in HCl solution was studied by weight loss measurement, potentiodynamic polarization and atomic force microscopy techniques. The studies of weight loss measurement show that the inhibition efficiency was up to 99.54 % at the inhibitor concentration of 2.717×10-4 M in 1.0 M HCl solution at 25°C. The adsorption of NOCP on carbon steel surface obeys the Langmuir isotherm. Polarization curves indicate NOCP is a mixed-type inhibitor, and the obtained standard free energy of adsorption suggests that the chemisorption takes place spontaneously. The effects of temperature, acid concentration and immersion time were also studied.
347
Authors: Guang Hui Zhang, Lin Liang Yin, Sheng Tao Zhang, Xiao Li
Abstract: The adsorption behavior of sulfamethoxazole as inhibitor for mild steel in 3% HCl solution at 298K has been studied by the methods of polarization curves, electrochemical impedance spectroscopy, weight loss, and quantum chemical calculation in this paper. Results revealed that the sulfamethoxzole acted essentially as the mixed-type inhibitor, and the spontaneous adsorption process involved in both chemical adsorption and physical adsorption. In addition, the adsorption of inhibitor on the steel surface followed Temkin adsorption isotherm model. However, the repulsion among the neighboring adsorbed molecule, as well as the single adsorption center of benzene ring, leaded the failure to form ideal protection film on the metal surface.
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Authors: Yong Zhang Zhou, Chun Yan Yang, Xin Ni, Dong Sheng Chen
Abstract: The inhibition effect of corrosion and scale inhibitor WJF-6 on Q235 steel in simulated seawater circulation cooling water was studied by rotary coupon corrosion tests. And corrosion mechanism of this inhibitor was researched by some electrochemical measurements such as polarized curves and linear polarization, scale inhibition performance of this inhibitor was studied by static anti-scale method. At the same time, the corrosion and scaling influence of concentrated 1,2,3times for corrosion and scale inhibitor WJF-6, used in simulated seawater circulation cooling water, was researched. The results showed that the corrosion inhibitor efficiency reached 91.8% with 75mg/L of the inhibitor with linear velocity of 0.3m/s, and rotation of 72h at 50°C when concentrated multiple was three times. The results of linear polarization showed polarized resistance greatly increase by adding 75mg/L of this kind of inhibitor, its inhibition rate achieved 81.3%. The results of polarized curve revealed the strong polarized area of polarized curve have left shift and anodic polarized curves of electrode reaction was increased in strong polarized area, the basic function of corrosion and scale inhibitor WJF-6 is that the anodic process of electrode reaction were restrained. The effect of concentration multiple on corrosion and scale inhibitor WJF-6 in simulated seawater circulation cooling water showed that the corrosion rate was less than 0.125mm/a of the national standard and when concentrated multiple of simulated seawater circulation cooling water exceeded three times, and scale inhibition rate was more than 90%.
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