三唑化合物在1mol/L盐酸中对碳钢的缓蚀作用研究

合成了一种新型三氮唑化合物：1-（3-（4-氟苯基）-4，5-吡唑基-2-（1，2，4-三唑基）乙酮，并通过失重实验、动电位极化、交流阻抗及扫描电镜方法研究了其在1mol／L盐酸溶液中对Q235碳钢的缓蚀效果。结果表明，该三唑化合物在1mol／L盐酸中对Q235碳钢有较好的缓蚀效果，是混合型缓蚀剂，该缓蚀剂在碳钢表面的吸附符合Langmuir等温吸附式。     

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．     

盐酸溶液中羧甲基壳聚糖对碳钢的缓蚀吸附性能研究

用失重法研究了1 mol/L盐酸溶液中羧甲基壳聚糖（Carboxymenthylchitosan（CM-chitosan））对碳钢的缓蚀作用.结果表明，CM-chitosan对碳钢在盐酸介质中的腐蚀具有良好的缓蚀作用，随着浓度的增加缓蚀效率增大.在200 mg/L的浓度下达到最高.用电化学阻抗法测定了碳钢在盐酸溶液中的零电荷电位，确立了CM-chitosan 的吸附模型.303K～343K内CM-chitosan在碳钢表面的吸附遵循Langmuir规律，并获得吸附过程ΔGo、ΔHo和ΔSo等重要热力学参数.     

盐酸溶液中苯腈类化合物对碳钢缓蚀的灰色理论研究

通过运用灰色理论建模思想，建立缓蚀体系的灰色缓蚀模型，研究了盐酸溶液中苯腈类化合物对碳钢缓蚀的缓蚀性能与分子结构的关系．所研究的苯腈类化合物包括苯腈类母体化合物(苯丙烯腈、苯甲腈、苯乙腈、异丙基苯乙腈)和对氯苯腈类化合物(对氯苯丙烯腈、对氯苯甲腈、对氯苯乙腈、对氯异丙基苯乙腈)．研究结果表明，盐酸溶液中苯腈类母体化合物和对氯苯腈类化合物对碳钢缓蚀的缓蚀性能与分子结构参数的关系，可用GM(0，3)模型描述．缓蚀性能主要与化合物分子氰基上氮原子的净电荷密度和分子最低空轨道能量有关，氰基氮原子上的净电荷密度(绝对值)σN越高、分子的最低空轨道能量ELUMO越低，缓蚀性能越高．     

1-乙氨基-2-三氯甲基-咪唑啉的制备及其缓蚀性能

合成了新型的含氯咪唑啉化合物(CIM),以1H-NMR和FTIR确定其结构。采用静态失重法、动电位极化曲线、电化学阻抗等方法研究了CIM在0.5mol/L盐酸溶液中对碳钢的腐蚀抑制作用。结果表明,CIM的缓蚀率随其浓度增大而增大,且在高温时保持高效的缓蚀性能。CIM在碳钢表面的吸附行为符合Langmuir吸附等温式,属于混合型吸附。     

苯骈三氮唑对碳钢在溴化锂溶液中的缓蚀作用

用静态挂片法研究了苯骈三氮唑(BTA)对碳钢在溴化锂溶液中缓蚀作用，并通过极化曲线探讨其缓蚀作用的机理，用扫描电镜观察形成的表面膜形态，用红外光谱探讨表面膜的组成。实验表明苯骈三氮唑对碳钢在溴化锂溶液中有一定的缓蚀作用，其中添加0．020mol／L苯骈三氮唑和0．20mol／L氢氧化锂显著抑制溴化锂溶液对碳钢的腐蚀，分析可能是在碳钢表面形成一层Fe-BTA吸附膜，对阳极反应和阴极反应起一定阻滞作用。     

盐酸溶液中阳离子Gemini表面活性剂在碳钢表面的吸附与缓蚀性能研究

 合成并用元素分析和核磁共振(1H-NMR)表征了阳离子Gemini表面活性剂1,2-双亚甲基-双(十烷基二甲基溴化铵)和1,2-双亚甲基-双(十二烷基二甲基溴化铵)(分别简写为10-2-10和12-2-12)，并用失重法研究了1M盐酸溶液中该类表面活性剂在碳钢表面的吸附行为及其缓蚀性能.实验结果表明，其缓蚀机理为表面活性剂在钢铁表面的吸附形成单分子膜，从而阻碍了盐酸对钢铁的侵蚀，其缓蚀效率随着表面活性剂浓度的增加而增加，当表面活性剂浓度接近其临界胶束浓度时达到最大，理论计算表明，在研究的浓度范围内，盐酸溶液中该类Gemini表面活性剂在碳钢表面的吸附行为符合Langmuir吸附等温式.      

磷酸酯基咪唑啉化合物的合成及其在HCl水溶液中的腐蚀抑制机理

目的通过三乙烯四胺和苯甲酸合成IMBT,再利用IMBT、H3PO3和甲醛经过曼尼希反应制得IMBTM,并探究其对碳钢在HCl水溶液中的缓蚀作用。方法采用动态失重法、电化学技术以及热力学等方法研究缓蚀剂IMBT和IMBTM在60℃、1 mol/L的盐酸溶液中对10#碳钢的缓蚀性能和吸附规律。结果利用IR对产物进行表征,均得到了产物特征峰。在动态失重试验中,IMBT和IMBTM两种缓蚀剂的质量浓度为3 g/L时,碳钢的腐蚀速率分别为3.92、2.94 g/(m2·h),缓蚀剂的缓蚀率分别为79.65%和84.75%。极化曲线试验表明随着两种缓蚀剂浓度增加,腐蚀电位正移,阳极电流密度下降明显。交流阻抗的测试显示随着两种缓蚀剂浓度增大,容抗弧半径逐渐增大,且在相同浓度下,添加IMBTM时的容抗弧半径更大。另外,随着缓蚀剂浓度的增加,拟合参数Rct增大、Cdl减小,证明缓蚀剂在金属表面取代了水,并吸附成膜。研究等温吸附模型,发现数据带入Langmuir等温吸附方程后,表现出了很好的线性关系。结论在1 mol/L HCl溶液中,IMBT和IMBTM对10#碳钢均有缓蚀作用,且IMBTM的缓蚀作用较高。两种缓蚀剂均属于阳极型缓蚀剂,对阳极的缓蚀作用较高。且两种化合物在10#碳钢表面上的吸附过程为自发放热过程,其吸附规律遵循Langmuir等温吸附式,属于单分子层吸附。     

酸性介质中壳聚糖磷酸酯对碳钢的缓蚀效能

采用失重法研究了壳聚糖磷酸酯在1mol/L HCl和1mol/L H2SO4中的缓蚀性能,采用极化曲线和电化学阻抗法分析了缓蚀机理,并通过扫描电镜对腐蚀形貌进行了分析。结果表明:壳聚糖磷酸酯在盐酸和硫酸体系中对碳钢腐蚀具有很好的抑制作用,在1mol/L HCl中缓蚀率随浓度增加而升高,在1mol/L H2SO4中缓蚀率先升高后降低;极化曲线表明壳聚糖磷酸酯在酸体系中是以抑制阳极过程为主的缓蚀剂;在碳钢表面发生单分子层吸附。     

牛黄解毒片在1mol/L HCl中的缓蚀性能研究

采用失重法和电化学方法研究了牛黄解毒片试剂在1 mol/L HCl溶液中对Q235碳钢的缓蚀作用.结果表明,环境友好的牛黄解毒片试剂在盐酸中具有一定的缓蚀作用.随着缓蚀剂加入量的不断增大,其缓蚀效果呈现先增大后减小的的极大值行为,在加入量为1.25 g/L时,其缓蚀效率达到最大值.     

异喹啉季铵盐缓蚀剂FIQ－C在盐酸中的缓蚀行为研究

研究了天然高分子改性异喹啉季铵盐絮凝－缓蚀剂FIQ－C在10％盐酸溶液中对Q235钢的缓蚀性能,讨论了药剂用量,温度,时间对缓蚀性能的影响,以及FIQ－C与EDTMP的协同缓蚀效应,并通过极化曲线,扫描电镜及俄歇能谱,探讨了FIQ－C在盐酸介质中的缓蚀机理,结果表明,FIQ－C在10％盐酸介质中对Q235钢具有良好的缓蚀作用,是一种阴,阳极混合型缓蚀剂。     

电泳-电沉积镍基纳米复合镀层Ni-Al2O3的耐蚀性能

采用电泳-直流电沉积和电泳-脉冲电沉积工艺制备了具有较高Al2O3含量的Ni-Al2O3纳米复合镀层,分析了纳米粒子对复合镀层表面形貌及微观组织的影响,并以静态浸泡试验法研究了镀层在质量分数为l0％的HCl溶液和l0％的H2SO4溶液中的耐蚀性能.结果表明,相比于纯金属镀层,电泳-电沉积纳米复合镀层的晶粒细小、组织致密...     

Ni-ZrO2纳米复合电镀层的制备及其耐蚀性研究

采用电镀工艺制备了纯镍电镀层和NiZrO2纳米复合电镀层，对纯镍电镀层和NiZrO2纳米复合电镀层分别在10％HCl和10％H2SO4溶液中的耐蚀性进行了对比研究，用SEM对各种电镀层腐蚀后的表面形貌进行了观察.结果表明，在脉冲条件下所制备纳米复合电镀层的耐蚀性明显优于其它电镀层，其原因是电镀层中复合有适量的纳米ZrO2颗粒以及脉冲电沉积工艺本身所致.      

Inhibitorwirksamkeit beim Langzeitschutz von Stahlbehältern für die chemische Oberflächenvorbereitung gegen örtliche Korrosion durch salzsäurehaltige Prozesslösungen

Inhibitor efficiency in long‐time protection of steel tanks for the chemical surface preparation against local corrosion by process solutions containing hydrochloric acid The efficiency of prevailing acid inhibitors is examined by age hardening heavy tank‐steel plates in technically usual hot‐galvanizing solutions for 1000 hours. With acid inhibitors local corrosion emerged as shallow pit formation first and foremost in hydrochlorid acid pickles (20 g/l HCl) at ambient temperature as well as in cleaners containing hydrochloric acid (10–30 g/l HCl) at 40°C when other conditions also applied. Above all, local corrosion was produced if the inhibitor concentration became too low (0.2 g/l) in connection with a minimum hydrochloric acid concentration (10–30 g/l). However, oxidizing agents like iron(III)‐ions (5–10 g/l), atmospheric oxygen and free chlorine (100–1000 mg/l) lead to local corrosion, too. Local corrosion did not emerge in rinse baths (2–10 g/l HCl) and fluxing material solutions of zinc chloride and ammonium chloride (pH value: 2.0–5.5). Here uniform corrosion developed. Acid inhibitors turned out to be very effective against uniform corrosion in the examined long‐time period (inhibiting values up to 99%).     

电沉积非晶态Ni-P合金的腐蚀行为

<正> 电沉积Ni-P合金时,只要沉积层中的磷含量大于8at％就能得到非晶态。 尽管化学镀Ni-P已作为防护工程的一种标准镀层,而电镀Ni-P台金的研究还相当有限。本工作就电镀非晶态Ni-P合金在若干酸中的腐蚀行为进行了研究。     

MBT、BTA和MBO对铜缓蚀性能的电化学研究

用电化学方法比较研究了２－巯基苯并恶唑（ＭＢＯ），苯并三唑（ＢＴＡ）和２－巯基苯并噻唑（ＭＢＴ）在３％ＮａＣｌ，０．１ｍｏｌ／Ｌ ＨＣｌ和０．５ｍｏｌ／Ｌ ＨＣｌ溶液中对铜的缓蚀性能，在３％ＮａＣｌ溶液中，ＭＢＯ表现出稍优于ＢＴＡ，远高于ＭＢＴ的缓蚀能力；与ＢＴＡ和ＭＢＴ相比，在０．１ｍｏｌ／Ｌ ＨＣｌ和０．５ｍｏｌ／Ｌ ＨＣｌ中，ＭＢＯ对铜的腐蚀有突出的缓蚀效果。     

Stress—corrosion cracking of austenitic stainless steel in hydrochloric acid media at room temperature

Stress—corrosion cracking of solution quenched, type 304, stainless steel can occur at room temperature in HCl solutions ranging between 5·10^?1M and 1M HCl. The cracking observed in HCl solutions is similar to that previously observed in H₂SO₄ + NaCl and HClO₄ + NaCl solutions. Cracking occurs at ? 0·200 V (NHE), in the active potential region, it is under cathodic control, and it develops in conditions under which the corrosion rate of the external surface area is more or less constant and independent of the HCl concentration, in the range 10^?1 M?1 M HCl. At higher HCl concentrations, corrosion rates increase and uneven, general corrosion occurs instead of cracking. The development of pitting and stress—corrosion cracking under active conditions precludes the conclusion that active—passive cells always play a role in localized corrosion and, in particular, in stress—corrosion cracking. Under these conditions, it has been shown that sensitized and non-sensitized specimens behave similarly (giving rise in both cases to transgranular cracking); active—passive cells, due to chromium depletion at the grain boundaries, are not involved. Active—passive corrosion mechanisms can however arise at more noble potentials (0·100?0·200 V NHE), as in the case of HClH₂O₂ solutions of specific concentration, producing intergranular corrosion of the stainless steel in the sensitized condition.     

Corrosion behaviour of carbon steel in different concentrations of HCl solutions containing H2S at 90 °C

The corrosion behavior of SAE-1020 carbon steel in H₂S-containing solutions with different concentration of HCl at 90 °C was investigated by weight loss, electrochemical measurements, SEM and XRD analysis. The results showed that the corrosion rate of carbon steel increased with increasing HCl concentration. Uniform corrosion was found on the carbon steel surface in H₂S + HCl solutions, while corrosion cavities were observed in the solution only containing H₂S. The ratio of Faradaic process of total corrosion process increased with the increase of HCl concentration. The corrosion products were solely composed of mackinawite in the H₂S-containing solutions with or without HCl.     

Control of zinc corrosion in acidic media: Green fenugreek inhibitor

Fenugreek seeds extract was examined as a green corrosion inhibitor for Zn in 2.0 mol/L H₂SO₄ and 2.0 mol/L HCl solutions by mass loss and electrochemical measurements. Scanning electron microscope (SEM) images show that the surface damage is decreased in the presence of the inhibitor. X-rays photoelectron spectroscopy (XPS) analysis was performed to identify the corrosion product, ZnO, and to prove the inhibitor adsorption mechanism. The maximum inhibition efficiency values are 90.7% after 1 h and 66.6% after 0.5 h by 200 mL/L of fenugreek extract in H₂SO₄ and HCl solutions, respectively. Addition of I⁻ ion greatly improves the inhibition efficiency of fenugreek seeds extract for Zn corrosion in HCl due to the synergistic effect. Potentiodynamic polarization and EIS measurements prove the inhibition ability of fenugreek for Zn corrosion in HCl as indicated by the decreased corrosion current density and increased charge transfer resistance values in the presence of fenugreek.     

Corrosion inhibition of mild steel by schiff base compounds in various aqueous solutions: part 1

The corrosion inhibition by Schiff base compounds derived from diamines and o-hydroxy, o-methoxy aromatic aldehydes was investigated by weight loss, electrochemical measurements and surface analysis of SS 400 in various aqueous solutions such as tap water (LC), concentrated tap water (HC) and HCl solutions. The maximum inhibition efficiency (η) of N,N′-bis (salicylaldehyde)-1,12-diaminododecane (Saldn) for SS 400 in HCl solution approached 93%. The adsorption of Saldn on mild steel in HCl solution was obeyed Langmuirs isotherm.