Inhibition effect of nonionic surfactant on the corrosion of cold rolled steel in hydrochloric acid

The inhibition effect of Tween-20 as a nonionic surfactant on the corrosion of cold rolled steel (CRS) in 1.0-8.0 M HCl has been studied at different temperatures (20-50 °C) by weight loss and potentiodynamic polarization methods. Atomic force microscope (AFM) provided the CRS surface conditions. The results show that Tween-20 is a good inhibitor in 1.0 M HCl, and the inhibition efficiency (IE) increases with the inhibitor concentration, while decreases with increasing the hydrochloric acid concentration and temperature. Effect of immersion time was also studied and discussed. The adsorption of inhibitor on the CRS surface obeys the Langmuir adsorption isotherm equation. Both thermodynamic and kinetic parameters have been obtained by adsorption theory and kinetic equations. The inhibition effect is satisfactorily explained by the parameters. Polarization curves show that Tween-20 is a mixed-type inhibitor in hydrochloric acid. The results obtained from weight loss and polarization are in good agreement, and Tween-20 inhibition action could also be evidenced by surface AFM images.     

核桃叶提取物在盐酸介质中对钢的缓蚀性能

核桃（Juglans）叶提取物（JLE）可以作为“绿色”环保的植物缓蚀剂。本工作采用失重法和动电位极化曲线研究了JLE在1mol／LHCI溶液中对冷轧钢的缓蚀作用。结果表明,JLE对冷轧钢具有较好的缓蚀作用,且存钢表面的吸附符合校正的Langmuir吸附等温式,极化曲线表明,JLE为混合抑制型缓蚀剂。     

红四氮唑对冷轧钢在磷酸溶液中的缓蚀性能

用失重法、动电位极化曲线和原子力显微镜（AFM）研究了红四氮唑对冷轧钢在1.0 mol/L~10.0 mol/L H₃PO₄溶液中的缓蚀作用。结果表明：红四氮唑对冷轧钢具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,且在钢表面的吸附符合Freundlich吸附模型;通过吸附热力学和腐蚀动力学公式分别求出了相应的吸附热力学参数和动力学参数,并根据这些参数详细讨论了缓蚀作用机理;AFM测试结果表明添加红四氮唑后钢表面较为平整,粗糙度降低。     

Two pyrazine derivatives as inhibitors of the cold rolled steel corrosion in hydrochloric acid solution

The inhibition effect of two pyrazine derivatives of 2-aminopyrazine (AP) and 2-amino-5-bromopyrazine (ABP) on the corrosion of cold rolled steel (CRS) in 1.0 M hydrochloric acid (HCl) was studied by weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS) methods. The results show that both AP and ABP are good inhibitors, and inhibition efficiency follows the order: ABP > AP. The adsorption of each inhibitor on CRS surface obeys Langmuir adsorption isotherm. Potentiodynamic polarization curves show that two pyrazine derivatives act as mixed-type inhibitors. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability.     

云南甜龙竹竹叶提取物在盐酸中对钢的缓蚀作用

云南甜龙竹竹叶提取物（DBLE）可作为一种环境友好型植物缓蚀剂,用红外光谱（FTIR）表征了DBLE的主要官能团。采用失重法、动电位极化曲线、EIS和SEM研究了 DBLE在1.0 mol/L HCl溶液中对冷轧钢的缓蚀作用。结果表明：DBLE具有良好的缓蚀作用,最大缓蚀率达93%,且在钢表面的吸附符合Langmuir吸附等温式。通过Van't Hoff方程和Arrhenius公式分别求出了吸附热 Δ H_ads和表观活化能E_a,并据此讨论了缓蚀作用机理。DBLE为混合抑制型缓蚀剂;EIS谱呈半圆容抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大。SEM再次表明DBLE 对钢具有好的缓蚀作用。     

Inhibition action of tween‐80 on the corrosion of cold rolled steel in sulfuric acid

The inhibition action of a nonionic surfactant of tween‐80 on the corrosion of cold rolled steel (CRS) in sulfuric acid (H₂SO₄) has been investigated by weight loss and potentiodynamic polarization methods. Atomic force microscope (AFM) provided the CRS surface conditions. The results show that tween‐80 is a good inhibitor in 1.0 M H₂SO₄, and its adsorption obeys Langmuir adsorption isotherm. Effects of temperature (20–50 °C) and acid concentration (0.5–7.0 M) on the inhibition action were investigated. Polarization curves show that tween‐80 is a mixed‐type inhibitor in sulfuric acid, but prominently inhibits the cathodic reaction. The results obtained from weight loss and potentiodynamic polarization are consistent, and the inhibition action could also be evidenced by AFM images.     

磷酸介质中甲酚红对冷轧钢的缓蚀作用

    用失重法研究了酸碱指示剂甲酚红对冷轧钢在1.0~10.0 mol/L H3PO4溶液中的缓蚀作用.结果表明：甲酚红对冷轧钢在1.0 mol/L H3PO4溶液中具有良好的缓蚀作用,且在钢表面的吸附符合Temkin吸附等温式,缓蚀率随缓蚀剂浓度的增加而增大,但随磷酸浓度和温度的增加而减小.通过吸附理论和动力学公式求出了相应的吸附热力学及动力学参数,并根据这些参数详细讨论了缓蚀作用机理.     

Acid violet 6B as a novel corrosion inhibitor for cold rolled steel in hydrochloric acid solution

The inhibition effect of acid violet 6B (AV6B) on the corrosion of cold rolled steel (CRS) in 1.0–5.0 M HCl solution was studied for the first time by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. The results show that AV6B is a very good inhibitor in 1.0 M HCl, and the adsorption of AV6B on CRS surface obeys Langmuir adsorption isotherm. Polarization curves reveal that AV6B behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. Effects of immersion time and acid concentration on inhibition performance were also discussed.     

硫酸中核桃叶提取物对钢的缓蚀性能

核桃叶提取物是一种"绿色"缓蚀剂.本文采用失重法、动电位极化曲线研究了核桃叶提取物在0.5mol/LH2SO4溶液中对冷轧钢的缓蚀作用.结果表明:核桃叶提取物对冷轧钢具有较好的缓蚀作用,在冷轧钢表面的吸附符合校正的Langmuir吸附等温式,极化曲线表明,核桃叶提取物为混合型缓蚀剂.     

Inhibition effect of methyl violet on the corrosion of cold rolled steel in 1.0 M HCl solution

The inhibition effect of methyl violet (MV) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl solution at 20-50 °C was studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) methods. The results show that MV is an excellent inhibitor even with very low concentration, and the adsorption of MV on CRS surface obeys Langmuir adsorption isotherm. Potentiodynamic polarization curves reveal that MV behaves as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. The inhibition action of MV is also evidenced by SEM.     

滇润楠叶提取物在H_3PO_4中对钢的缓蚀性能研究

采用失重法、动电位极化曲线和电化学阻抗谱(EIS)研究了滇润楠(Machilus yunnanensis)叶提取物(MYLE)在1.0 mol/L H3PO4中对冷轧钢缓蚀作用。结果表明:MYLE在1.0mol/L H3PO4溶液中对冷轧钢具有良好的缓蚀作用,缓蚀率随缓蚀剂浓度的增加而增大,但随温度的升高而降低。MYLE在钢表面的吸附符合Temkin吸附等温式。MYLE为混合抑制型缓蚀剂;EIS谱在高频区呈容抗弧,在低频区出现小段感抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大。     

Blue tetrazolium as a novel corrosion inhibitor for cold rolled steel in hydrochloric acid solution

The inhibition effect of blue tetrazolium (BT) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl solution at 20 °C was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) methods. The results show that BT is a very good inhibitor, and the adsorption of BT on CRS surface obeys Langmuir adsorption isotherm. Polarization curves reveal that BT acts as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability. The inhibition action of BT is also evidenced by SEM images.     

Synergistic inhibition between tween 60 and NaCl on the corrosion of cold rolled steel in 0.5 M sulfuric acid

The corrosion inhibition of cold rolled steel in 0.5 M sulfuric acid in the presence of tween 60 and sodium chloride (NaCl) has been investigated by using weight loss and electrochemical techniques. The inhibition efficiency increases with increasing tween 60 concentration at the same temperature, but decreases with increasing temperature studied. A synergistic effect exists when tween 60 and chloride ions are used together to prevent cold rolled steel corrosion in 0.5 M sulfuric acid at every experimental temperature. The polarization curves show that tween 60 is a cathodic inhibitor, while the complex of tween 60 and NaCl is a mixed-type inhibitor. The experimental results suggest that the presence of chloride ions in the solution stabilizes the adsorption of tween 60 molecules on the metal surface and improves the inhibition efficiency of tween 60. The adsorption of single tween 60 follows the Temkin adsorption isotherm, but the complex accords with the Langmuir adsorption isotherm. Some thermodynamic parameters such as adsorption heat, adsorption entropy and adsorption free energy has been calculated by employing thermodynamic equations. Kinetic parameters such as apparent activation energy and pre-exponential factor have been calculated and discussed.     

新型巯基三唑化合物对HCl介质中碳钢的缓蚀作用研究

合成了两种新型巯基三唑化合物，分别采用腐蚀失重法、动电位扫描极化曲线和交流阻抗法研究了其在1．0mol／L HCl介质中对Q235钢的缓蚀作用，分析了缓蚀作用机理．结果表明：对碳钢在1．0mol／L HCl溶液中，合成的巯基三唑化合物是性能优异的缓蚀剂．     

Triazolyl blue tetrazolium bromide as a novel corrosion inhibitor for steel in HCl and H2SO4 solutions

The inhibition effect of triazolyl blue tetrazolium bromide (TBTB) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl and 0.5 M H₂SO₄ solution was investigated for the first time by weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS) methods. The results show that TBTB is a very good inhibitor, and is more efficiency in 1.0 M HCl than 0.5 M H₂SO₄. The adsorption of TBTB on CRS surface obeys Langmuir adsorption isotherm. Polarization curves reveal that TBTB acts as a mixed-type inhibitor in both acids.     

Alizarin violet 3B as a novel corrosion inhibitor for steel in HCl, H2SO4 solutions

The inhibition effect of alizarin violet 3B (AV3B) on the corrosion of cold rolled steel (CRS) in 1.0 M HCl and 0.5 M H₂SO₄ solutions was investigated for the first time by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods. The results show that AV3B is a good inhibitor, and exhibits more efficient in 1.0 M HCl than 0.5 M H₂SO₄. The adsorption of AV3B on CRS surface obeys Langmuir adsorption isotherm in both acids. Polarization curves reveal that AV3B acts as a mixed-type inhibitor.     

Inhibition effect of 6-benzylaminopurine on the corrosion of cold rolled steel in H2SO4 solution

The inhibition effect of 6-benzylaminopurine (BAP) on the corrosion of cold rolled steel (CRS) in 1.0-7.0 M H₂SO₄ at 25-50 °C was studied by weight loss and potentiodynamic polarization methods. Fourier transform infrared spectroscopy (FTIR) and atomic force microscope (AFM) were used to characterize the CRS surface. The results showed that BAP was a good inhibitor in 1.0 M H₂SO₄, and the adsorption of BAP obeyed the Temkin adsorption isotherm. Polarization curves showed that BAP acted as a mixed-type inhibitor in sulfuric acid. Depending on the results, the inhibitive mechanism was proposed.     

Corrosion inhibition of mild steel in acidic solution by some oxo-triazole derivatives

The oxo-triazole derivative (DTP) was synthesized and its inhibiting action on the corrosion of mild steel in sulphuric acid was investigated by means of weight loss, potentiodynamic polarization, EIS and SEM. The results revealed that DTP was an excellent inhibitor and the inhibition efficiencies obtained from weight loss experiment and electrochemical experiment were in good agreement. Potentiodynamic polarization studies clearly revealed that DTP acted essentially as the mixed-type inhibitor. Thermodynamic and kinetic parameters were obtained from weight loss of the different experimental temperatures, which suggested that at different temperatures (298–333 K) the adsorption of DTP on metal surface obeyed Langmuir adsorption isotherm model.     

元宝枫叶提取物在硫酸中对钢的缓蚀作用

采用失重法、动电位极化曲线和电化学阻抗谱(EIS)研究了元宝枫叶提取物在0.5 mol/L H28O4溶液中对冷轧钢腐蚀的影响.结果表明:元宝枫叶提取物对冷轧钢具有良好的缓蚀作用,且在钢表面的吸附符合Langmuir吸附等温式;元宝枫提取物为混合抑制型缓蚀剂;EIS谱在高频区呈容抗弧,在低频区出现感抗弧,电荷转移电阻随...     

木薯淀粉接枝共聚物在盐酸介质中对冷轧钢的缓蚀作用

采用氧化还原引发体系引发木薯淀粉与丙烯酰胺接枝共聚反应制备的天然木薯淀粉接枝共聚物(SGA),可以作为一种环境友好型绿色缓蚀剂。本文用失重法、动电位极化曲线、电化学阻抗(EIS)和扫描电子显微镜(SEM)首次研究了SGA在1.0mol/L HCl溶液中对冷轧钢的缓蚀作用。结果表明,SGA对冷轧钢具有良好的缓蚀作用,在钢表面的吸附符合Langmuir吸附等温式,为混合抑制型缓蚀剂;EIS谱呈半圆容抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大。SEM表明SGA在钢表面吸附形成了致密的缓蚀剂膜层。