绿色缓蚀剂聚天冬氨酸对铜的缓蚀性能与吸附行为

采用电化学阻抗和极化曲线法研究了绿色缓蚀剂聚天冬氨酸(PASP)对铜在200 mg·L-1的NaCl溶液中的缓蚀性能和吸附行为. 结果表明, 在20 ℃时, PASP使用的最佳浓度为15 mg·L-1, 缓蚀率可达到78.3%, PASP的吸附明显降低了Cl-的侵蚀, 属于阳极型缓蚀剂. 随着温度的升高, PASP的缓蚀性能下降. 在50 ℃时, PASP的缓蚀率下降至40.4%. PASP的吸附行为服从Langmuir吸附等温式,是自发的、放热的过程, 属于化学吸附.     

聚天冬氨酸和钨酸钠复配对3%NaCl溶液中白铜B10的缓蚀作用

应用交流阻抗法和极化曲线法,研究了两种环境友好型水处理药剂,即聚冬天氨酸(PASP)和钨酸钠的单一配方及其复配对白铜(B10)在3%NaC l溶液中的缓蚀效果.研究表明:单一聚冬天氨酸或钨酸钠配方对B10均具有一定的缓蚀效果,其中聚冬天氨酸以浓度为40 mg/L,钨酸钠以浓度为60 mg/L时的缓蚀效果最佳.总浓度为40 mg/L的两者复配具有更加明显的缓蚀效果并显示出协同效应,其中以聚冬天氨酸与钨酸钠配比为3∶1的缓蚀效果最佳.     

盐酸介质中水杨醛缩氨基硫脲对碳钢的缓蚀作用

合成了新型席夫碱缓蚀剂:水杨醛缩氨基硫脲(ST),并考察了其在1 mol/L盐酸溶液中对碳钢的缓蚀性能。通过静态失重、动电位极化曲线、交流阻抗等技术手段研究缓蚀剂浓度对腐蚀速率及缓蚀效率的影响,阐明缓蚀作用机理。结果表明,ST在盐酸介质中对碳钢具有良好的缓蚀性能。随着缓蚀剂浓度的增加,缓蚀效率逐渐增大。ST的加入显著降低了自腐蚀电流密度,为抑制阴极反应为主的缓蚀剂。ST在碳钢表面的吸附符合Langmuir吸附模型,为物理吸附与化学吸附共同作用。     

绿色聚天冬氨酸复配缓蚀剂对A3碳钢的缓蚀抑雾作用

采用失重法和极化曲线法研究了聚天冬氨酸(PASP)和十二烷基酚聚氧乙烯醚(OP-10)复配对A3碳钢在6mol·L-1HCl腐蚀介质中的协同吸附行为及缓蚀抑雾作用.结果表明:复配缓蚀剂可有效抑制A3碳钢在HC1介质中的腐蚀,当PASP浓度为20g·L-1,缓蚀率可达94%,抑雾率83%;随着温度的升高,复配缓蚀剂的缓蚀性能下降.复合缓蚀剂在钢表面的吸附符合校正的Langmuir模型,吸附过程为放热、熵减的自发过程;复配体系属于阳极型缓蚀剂.     

聚天冬氨酸与钨酸钠复配对白铜B10的缓蚀作用

应用光电化学的方法研究了两种环境友好型缓蚀剂聚冬天氨酸(PASP)和钨酸钠(Na2WO4)的单一配方及其复配对白铜B10在硼砂-硼酸缓冲溶液中的缓蚀作用援研究表明, 在光电流循环伏安测试中, 单一的PASP与Na2WO4均能够使B10表面Cu2O膜引起的p型光电流响应增大, 这说明缓蚀剂增大了Cu2O膜的厚度, 使B10的腐蚀速率减小. 单一的PASP与Na2WO4的最佳添加浓度分别为3和5 mg·L-1, 单一的Na2WO4比单一的PASP使p型光电流响应增大趋势更大. 若以总浓度为5 mg·L-1时对两者进行复配, 当PASP与Na2WO4的质量浓度比为1:1和1:3时, 两者复配比单一使用时的p型电流光响应都更大, B10的腐蚀更小, 即缓蚀剂的效果更好. 交流阻抗测试结果与光电化学测试相一致.     

5种氨基酸在HCl溶液中对铜的缓蚀作用

采用失重法、动电位极化曲线和电化学阻抗等方法,分别研究了1 mmol/L L-蛋氨酸（L-Met）、L-半胱氨酸（L-Cys）、L-精氨酸（L-Arg）、L-赖氨酸（L-Lys）和L-丙氨酸（L-Ala）在0.5 mol/L HCl溶液中对铜的缓蚀作用。实验结果表明,5种氨基酸均为阴极型缓蚀剂,其中L-赖氨酸缓蚀效果最好,缓蚀效率可达84.77 %,同时也说明L-赖氨酸结构中游离的双氨基对于铜的缓蚀具有一定作用。     

席夫碱缓蚀剂对碳钢材料的缓蚀性能

采用失重法和电化学方法研究了2种席夫碱类缓蚀剂N,N′-二水杨醛基-1,2-乙二亚胺(SB-Ⅰ)和水杨醛基吡啶-2-亚胺(SB-Ⅱ)在1mol/L盐酸溶液中对A3碳钢的缓蚀性能。失重实验表明,SB-Ⅰ和SB-Ⅱ在1mol/L盐酸溶液中的浓度为20mmol/L时,缓蚀效率分别达85%和92%。经三电极体系极化曲线和交流阻抗谱测定实验表明,缓蚀性能是由于碳钢材料表面为缓蚀剂分子吸附所致,二者均属阴极型缓蚀剂。     

氨基酸缓蚀剂在盐酸溶液中对钢的缓蚀作用

应用极化曲线、电化学阻抗谱等测试技术,研究了以谷氨酸作缓蚀剂在10%盐酸介质中对X65钢的缓蚀作用,测试腐蚀参数包括腐蚀电位(Ecorr)、极化电阻(Rp)、缓蚀效率(η)等.研究表明:该缓蚀剂是一种抑制阴极为主的混合型缓蚀剂,在较低的浓度具有良好缓蚀效果;缓蚀效率随着浓度的增加而提高,并在0.3g.L-1时达到最大值(90%以上).     

五种氨基酸在HCl溶液中对铜的缓蚀作用

采用失重法、动电位极化曲线和电化学阻抗谱等方法,分别研究了1mmol/L L-蛋氨酸、L-半胱氨酸、L-精氨酸、L-赖氨酸和L-丙氨酸在0.5mol/L HCl溶液中对铜的缓蚀作用。实验结果表明,5种氨基酸均为阴极型缓蚀剂,其中L-赖氨酸缓蚀效果最好,缓蚀效率可达84.77%,同时也说明L-赖氨酸结构中游离的双氨基对于铜的缓蚀具有一定作用。     

二硫代酰胺类化合物在盐酸中对碳钢的缓蚀性能(英文)

采用失重实验,动电位极化,交流阻抗,量子化学计算和拉曼光谱等方法研究了N,N′-二异丙氧基丙基二硫代二丙酰胺(DPDA)在1 mol.L-1盐酸溶液中对碳钢的缓蚀性能.失重实验结果表明,DPDA在盐酸溶液中能够有效地抑制碳钢的腐蚀,当缓蚀剂DPDA的浓度为1×10-3 mol.L-1时,其缓蚀效率达到90.2%.极化曲线表明DPDA为混合型缓蚀剂,单一的容抗弧变化表明碳钢电极表面的腐蚀过程主要由电荷转移步骤控制.由失重实验,动电位极化和电化学交流阻抗方法得到的DPDA缓蚀效率具有较好的相关性,均表现为缓蚀效率随着DPDA浓度的增大而增加.另外,DPDA在碳钢表面的吸附符合Langmuir吸附等温式.吸附过程的吉布斯自由能(ΔG0a0d0s)为-38.65 kJ.mol-1,这说明DPDA分子在碳钢表面形成共价键而发生了自发的化学吸附.拉曼光谱表明DPDA分子有效地吸附在碳钢表面,量子化学计算结果证明DPDA分子在碳钢表面的化学吸附活性中心集中在S原子上.     

2-十一烷基-N-羧甲基-N-羟乙基咪唑啉在柠檬酸溶液中对碳钢的缓蚀作用

采用失重实验、极化曲线和交流阻抗等方法研究了缓蚀剂2-十一烷基-N-羧甲基-N-羟乙基咪唑啉在质量分数为2%柠檬酸溶液中对碳钢的缓蚀性能。 失重实验表明,该缓蚀剂在柠檬酸溶液中能够有效地抑制碳钢的腐蚀,当其质量分数为0.4%时,缓蚀效率达到86.4%。 极化曲线表明,该缓蚀剂为混合型缓蚀剂,Nyquist图中单一的容抗弧变化表明碳钢电极表面的腐蚀过程主要由电荷转移步骤控制。 该缓蚀剂的吸附行为符合Langmuir吸附等温式,吸附机理是介于物理吸附和化学吸附之间的一种吸附。     

尿素对土壤中碳钢微生物腐蚀的影响

采用失重、极化曲线和阻抗谱等方法研究了尿素对土壤中微生物腐蚀(MIC)的影响. 研究结果表明, 在接菌土壤中尿素加速碳钢的腐蚀, 而在灭菌土壤中抑制其腐蚀. 接菌土壤中由于硫酸盐还原菌(SRB)的存在,腐蚀产物中检测到FeS₂. 电化学阻抗谱(EIS)的结果表明, 在实验后期腐蚀过程由浓差极化控制.     

酸性介质中羧甲基纤维素钠在低碳钢表面的吸附和缓蚀作用

The effect of sodiumcarboxymethyl cellulose (Na-CMC) on the corrosion behavior of mild steel in 1.0 mol·L-1 HCl solution has been investigated by using weight loss (WL) measurement, potentiodynamic polarization, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods. These results showed that the inhibition efficiency of Na-CMC increased with increasing the inhibitor concentration. Potentiodynamic polarization studies revealed that the Na-CMC was a mixed type inhibitor in 1.0 mol·L-1 HCl. The adsorption of the inhibitor on mild steel surface has been found to obey the Langmuir isotherm. The effect of temperature on the corrosion behavior of mild steel in 1.0 mol·L -1 HCl with addition of 0.04% of Na-CMC has been studied in the temperature range of 298-328 K. The associated apparent activation energy (E*a) of corrosion reaction has been determined. Scanning electron microscopy (SEM) has been applied to investigate the surface morphology of mild steel in the absence and presence of the inhibitor molecules.     

Adsorption Behavior and Inhibition Corrosion Effect of Sodium Carboxymethyl Cellulose on Mild Steel in Acidic Medium

The effect of sodium carboxymethyl cellulose (Na-CMC) on the corrosion behavior of mild steel in 1.0 mol·L-1 HCl solution has been investigated by using weight loss (WL) measurement, potentiodynamic polarization, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods. These results showed that the inhibition efficiency of Na-CMC increased with increasing the inhibitor concentration. Potentiodynamic polarization studies revealed that the Na-CMC was a mixed type inhibitor in 1.0 mol·L-1 HCl. The adsorption of the inhibitor on mild steel surface has been found to obey the Langmuir isotherm. The effect of temperature on the corrosion behavior of mild steel in 1.0 mol·L-1 HCl with addition of 0.04% of Na-CMC has been studied in the temperature range of 298-328 K. The associated apparent activation energy (E*a ) of corrosion reaction has been determined. Scanning electron microscopy (SEM) has been applied to investigate the surface morphology of mild steel in the absence and presence of the inhibitor molecules.     

Adsorption Behavior and Inhibition Corrosion Effect of Sodium Carboxymethyl Cellulose on Mild Steel in Acidic Medium

The effect of sodium carboxymethyl cellulose (Na-CMC) on the corrosion behavior of mild steel in 1.0 mol·L⁻¹ HCl solution has been investigated by using weight loss (WL) measurement, potentiodynamic polarization, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods. These results showed that the inhibition efficiency of Na-CMC increased with increasing the inhibitor concentration. Potentiodynamic polarization studies revealed that the Na-CMC was a mixed type inhibitor in 1.0 mol·L⁻¹ HCl. The adsorption of the inhibitor on mild steel surface has been found to obey the Langmuir isotherm. The effect of temperature on the corrosion behavior of mild steel in 1.0 mol·L⁻¹ HCl with addition of 0.04% of Na-CMC has been studied in the temperature range of 298–328 K. The associated apparent activation energy (E^*_a) of corrosion reaction has been determined. Scanning electron microscopy (SEM) has been applied to investigate the surface morphology of mild steel in the absence and presence of the inhibitor molecules.     

红茶提取液在盐酸中对碳钢的缓蚀作用

采用动电位极化曲线和交流阻抗（EIS）研究了红茶提取液（BLE）在盐酸介质中对碳钢的缓蚀性能和缓蚀机理。 研究结果表明,采用索氏提取法从红茶茶叶中提取的缓蚀剂,对碳钢在1.0 mol/L盐酸溶液中具有良好的缓蚀性能,随着提取物浓度的增加,缓蚀效率增大。 红茶提取液中的有效缓蚀成分为抑制阴阳极反应的混合型缓蚀剂,在碳钢表面的吸附符合Langmuir等温式,属于单分子层吸附。     

盐酸溶液中氯代十六烷基吡啶在锌表面上的吸附及其缓蚀作用

盐酸溶液中氯代十六烷基吡啶在锌表面上的吸附及其缓蚀作用杨春芬，白宇新（云南大学化学系昆明６５００９１）关键词锌，氯代十六烷基吡啶，吸附，缓蚀作用在抑制金属腐蚀的方法中，缓蚀剂的应用是最受重视的一种，因为它具有用量少，不需附加设备和不改变金属制品本性等...     

2-氨基嘧啶在盐酸介质中对钢的缓蚀性能

用失重法、动电位极化曲线和电化学阻抗谱（EIS）研究了2-氨基嘧啶(2-AP)在1.0~5.0 mol/L HCl溶液中（20~50 ℃）对冷轧钢的缓蚀作用。 结果表明,2-AP对冷轧钢在1.0 mol/L HCl中具有良好的缓蚀作用,且在钢表面的吸附符合校正的Langmuir吸附模型;缓蚀率随缓蚀剂浓度的增加而增大,但随温度的升高和HCl浓度的增加而降低。 2-AP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。     

Influence of Molecular Weight on Mild Steel Corrosion Inhibition Effect by Polyvinyl Alcohol in Hydrochloric Acid Solution

The corrosion inhibition of mild steel in hydrochloric acid solution in the presence of three different molecular weights of polyvinyl alcohol (PVA) designated as PVA-I, PVA-II, and PVA-III corresponding to 14,000, 72,000, and 125,000 g mol^?1, respectively, was investigated using electrochemical impedance spectroscopy, linear polarization resistance (LPR), and potentiodynamic polarization techniques at 25°C. It was found that PVA of different molecular weights inhibited the corrosion of mild steel in the acid environment. Inhibition efficiency (η%) increases with increase in concentration of the polymers. LPR measurements clearly show that inhibition efficiency increases with increasing molecular weight in the order PVA-III > PVA-II > PVA-I. Polarization curves indicate that PVA functions as a mixed inhibitor affecting both the anodic metal dissolution and cathodic hydrogen evolution partial reactions of the corrosion process. The experimental data obtained fitted well into Langmuir adsorption isotherm model. Physical adsorption mechanism is proposed from the thermodynamic (free energy of adsorption) parameters obtained.