H2SO4中聚乙二醇20000在钢表面的吸附及缓蚀作用

用失重法研究了在1.0mol/L H2SO4中20-50℃聚乙二醇20000（PEG-20000）在冷轧钢表面上的吸附及缓蚀作用。结果表明：PEG-20000对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;但随温度的增加而增大。PEG-20000在钢表面的吸附符合Langmuir吸附模型。通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数（吸附自由能ΔG,°吸附焓ΔH°,吸附熵ΔS°）和动力学参数表观活化能Ea,并根据这些吸附参数详细讨论了缓蚀作用机理。     

H_2SO_4介质中KI在冷轧钢表面的吸附及缓蚀作用

用失重法和电化学法研究了在1.0~6.0 mol/LH2SO4介质中,20~60℃时K I在冷轧钢表面上的吸附及缓蚀作用。结果表明,K I在H2SO4中具有非常好的缓蚀作用,为混合抑制型缓蚀剂,最大缓蚀率超过98%;K I在钢表面的吸附符合Langmu ir吸附模型。通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数(吸附自由能ΔG0,吸附热ΔH0,吸附熵ΔS0)和动力学参数(腐蚀速度常数k,腐蚀动力学参数B),并根据这些参数详细讨论了缓蚀作用机理。     

H2SO4中KBr在冷轧钢表面的吸附及缓蚀作用

用失重法研究了在0.5～7.0 mol/L H2SO4 中20℃～60℃KBr在冷轧钢表面上的吸附及缓蚀作用.结果表明:KBr在H2SO4中具有较好的缓蚀作用,缓蚀率随KBr和H2SO4介质的浓度增加而增大,而随温度的增加稍有增大;KBr在钢表面的吸附符合校正的Langmuir吸附模型.通过吸附热力学和动力学公式分别求出了相应的吸附热力学参数(吸附自由能△G°,吸附热△H°,吸附熵△S°)和动力学参数(腐蚀速度常数k,腐蚀动力学参数B),并根据这些参数详细讨论了缓蚀作用杌理.     

硫酸溶液中KCl在冷轧钢表面的吸附及缓蚀作用

用失重法研究了在1.0~7.0 mol/L H2SO4中20~60℃时,KCl在冷轧钢表面上的吸附及缓蚀作用。结果表明:KCl在H2SO4中对冷轧钢具有中等程度的缓蚀作用,缓蚀率随KCl和H2SO4介质的浓度增加而增大,而随温度的变化缓蚀率排序为:50℃>30℃>40℃>60℃>20℃;KCl在钢表面的吸附符合Temkin吸附模型。通过Mathur经验动力学公式求出了腐蚀速度常数k和腐蚀动力学参数B,并根据这些参数详细讨论了缓蚀作用机理。     

HCl中有机染料在钢表面的吸附及缓蚀作用

用失重法研究了在1.0 mol/LHCl中5种有机染料——丽春红S(PS)、俾士麦棕Y(BBY)、玫瑰桃红R(BR)、橙黄G(OG)和橙黄IV(OIV)在冷轧钢表面的吸附及缓蚀作用。结果表明:染料PS和BBY具有中等程度的缓蚀作用,且在钢表面的吸附符合Temkin吸附模型;其余3种染料BR、OG和OIV的缓蚀性能较差。5种染料的缓蚀率排序为:PS>BBY>BR>OG>OIV。     

盐酸中烯丙基硫脲在钢表面的吸附及缓蚀作用

用失重法研究了在1.0 mol/L 盐酸中20～50℃烯丙基硫脲(ATU)在冷轧钢表面上的吸附及缓蚀作用.结果表明:ATU对钢具有良好的缓蚀作用,在钢表面的吸附符合Langmuir吸附模型.通过吸附理论和动力学Arrhenius公式分别求出了相应的吸附热力学参数(吸附自由能△G°, 吸附热△H°, 吸附熵△S°)和动力学参数表观活化能Ea,并根据这些参数详细讨论了缓蚀作用机理.     

磷酸溶液中油酸钠在钢表面的吸附及缓蚀作用

用失重法及电化学法研究了阴离子表面活性剂油酸钠(SO)对冷轧钢在3.0 mol/L H3PO4溶液中的缓蚀作用.结果表明:油酸钠对冷轧钢具有良好的缓蚀作用,为阴极抑制型缓蚀剂,缓蚀率随油酸钠的浓度增加而增大,而随温度的升高而减小;油酸钠在钢表面的吸附在30℃和40℃时符合校正的Langmuir吸附模型,50℃和60℃时则符合Freundlich吸附模型.通过吸附理论和化学热力学基本公式求出了相应的吸附热力学参数(吸附自由能ΔG°, 吸附热ΔH°, 吸附熵ΔS°),并根据这些参数详细讨论了缓蚀作用机理.     

盐酸中原儿茶醛在钢表面的吸附及缓蚀作用

用失重法和动电位极化曲线法研究了在1.0mol/L HCl中20~50℃原儿茶醛(3,4-二羟基苯甲醛)在冷轧钢表面上的吸附及缓蚀作用.结果表明:原儿茶醛具有中等程度的缓蚀作用,为混合抑制型缓蚀剂,缓蚀率随原儿茶醛的浓度增加而增大,但随温度的增加而减小;原儿茶醛在钢表面的吸附符合Freundlich吸附模型.通过吸附理论和动力学Arrhenius公式求出了相应的吸附热力学参数(吸附自由能ΔG°,吸附热ΔH°,吸附熵ΔS°)和动力学参数表观活化能Ea,并根据这些参数详细讨论了缓蚀作用机理.     

硫酸介质中各类表面活性剂在锌表面上的吸附及其缓蚀作用

用失重法研究了阴离子表面活性剂十二烷基磺酸钠（ＳＤＳ）,阳离子表面活性剂十二烷基胺（ＡＤＳ）和非离子表面活性剂聚乙二醇辛基苯基醚（ＯＰ）在硫酸介质中对锌的缓蚀作用,发现表面活性剂在锌表面上的吸附是产生缓蚀作用的重要原因,且吸附规律服从Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ方程,最后讨论了表面活怀剂的吸附取向。     

盐酸溶液中香兰素在钢表面的吸附及缓蚀作用

用失重法和动电位极化曲线法研究了香兰素(4-羟基-3-甲氧基-苯甲醛)在1.0 mol/L HCl中20～50℃下在冷轧钢表面上的吸附及缓蚀作用.结果表明:香兰素在HCl中为阴极抑制型缓蚀剂,缓蚀率随香兰素的浓度增加而增大,而随温度的增加而减小;香兰素在钢表面的吸附符合Temkin吸附模型.通过吸附理论求出了相应的吸附热力学参数(吸附自由能ΔGo,吸附热ΔHo,吸附熵ΔSo),并根据这些参数详细讨论了缓蚀作用机理.     

Zinc electrodeposition in the presence of polyethylene glycol 20000

The influence of polyethylene glycol 20000 (PEG₂₀₀₀₀) on the mechanism of zinc deposition and nucleation was studied by voltammetry, chronoamperometry, and atomic force microscopy (AFM). The electrodeposition of zinc in an electrolytic bath containing PEG₂₀₀₀₀ occurs via two reduction processes with different energies that involve the same species, ZnCl₄²⁻: the first reduction process occurs at E_PI′c = −1.25 V, SCE, whereas the second process, which corresponds to the bulk deposition of Zn, occurs at E_PII′c = −1.6 V, SCE without significant interference from the hydrogen evolution reaction. Analysis of chronoamperograms obtained in the absence and presence of PEG₂₀₀₀₀ indicates that distinct nucleation mechanisms are involved during the initial stages of Zn deposition. In the absence of PEG₂₀₀₀₀, the transients are consistent with the model of 3D diffusion-controlled nucleation. In the presence of PEG₂₀₀₀₀, however, the transients exhibit a more complex form involving two simultaneous nucleation and growth processes: 2D instantaneous nucleation limited by the incorporation of adatoms (2D_i-li) and a diffusion-controlled 3D nucleation mechanism (3D_-dc). Characterization of the surface morphologies of the zinc deposits by AFM imaging confirmed our conclusions drawn from the electrochemical studies. SEM analysis showed that the zinc coatings obtained in the presence of PEG₂₀₀₀₀ at −1.6 V, SCE are smoother and more compact.     

Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·L− 1 H2SO4 solution

The corrosion inhibition of cold rolled steel (CRS) in 7.0 mol·L^-1 H₂SO₄ solution by red tetrazolium (RTZ) was carefully investigated using both experimental procedures and theoretical techniques. The results show that RTZ acts as an effective inhibitor for the corrosion of CRS in 7.0 mol·L^-1 H₂SO₄, and the maximum inhibition efficiency is higher than 95% with a RTZ concentration of 2.0 mmol·L^-1. The adsorption of RTZ on CRS surface follows Langmuir isotherm. RTZ effectively retards both cathodic and anodic reactions, and acts as a mixed-type inhibitor. EIS exhibits two capacitive loops, and their resistances increase drastically in the presence of RTZ. SEM and AFM confirm that the addition of RTZ could significantly retard the corrosion of CRS surface. A series of characterizations like FTIR, RS, XRD and XPS reveal that the corrosion CRS surface is composed of the corrosion products of iron sulfates, iron oxides and iron hydroxide, as well as inhibitor. Theoretical results of quantum chemical calculation and molecular dynamics (MD) indicate that the adsorption center of RTZ⁺ (organic cationic part of RTZ) mainly relies on its tetrazole ring, and the adsorption of RTZ⁺ on Fe (001) surface is in a nearly flat orientation mode.     

Corrosion inhibition of carbon steel in hydrochloric acid by some polyethylene glycols

The inhibition effect of some PEGs on carbon steel corrosion at 25 °C in 0.5N hydrochloric acid as corroding solution was evaluated by weight loss method and polarization and electrochemical impedance spectroscopy (EIS) techniques. In order to study the effect of polyethylene glycols’ structure on the inhibition efficiency, different molecular weights (400, 1000, 4000, and 10,000 g mol⁻¹) were selected. This work has demonstrated that polyethylene glycols have inhibition effect on corrosion process and their inhibition efficiencies are between 50 and 90%. The inhibition efficiencies are increased by increase of the inhibitors’ concentration and molecular weight.     

HCl中溴化十四烷基吡啶在钢表面的吸附及缓蚀作用

用失重法和电化学法研究了在1.0 mol/LHC l中20~50℃时溴化十四烷基吡啶(TDPB)在冷轧钢表面上的吸附及缓蚀作用。结果表明,TDPB对钢具有非常好的缓蚀作用,为混合抑制型缓蚀剂,最大缓蚀率为99%,在钢表面的吸附符合Langmu ir吸附模型。求出了相应的吸附热力学参数(吸附自由能ΔG0,吸附热ΔH0,吸附熵ΔS0),并根据这些参数详细讨论了缓蚀作用机理。     

聚乙二醇二甲醚的合成及应用

综述了国内外聚乙二醇二甲醚的各种合成方法及各自的优缺点 ,详细介绍了聚乙二醇二甲醚在各领域的应用     

Gelcasting of ceramic suspension in acrylamide/polyethylene glycol systems

A new polyethylene glycol/acrylamide-based gelcasting system has been developed. The new system performs at least as well as, and in some cases better than, the original acrylamide-based system. The development of this system is for the sake of eliminating the surface-exfoliation phenomenon of green bodies gelcast in air. This study concentrates attention on dispersion, rheological and gelation behavior in the new system and flexural strength of green body.