咪唑啉/乙二胺四甲叉膦酸钠复配缓蚀阻垢剂的性能

采用静态阻垢试验筛选出具有优异阻垢性能的阻垢剂乙二胺四甲叉膦酸钠(EDTMPS),同时采用室内静态挂片法筛选出具有良好缓蚀性能的缓蚀剂咪唑啉,将两者进行复配,确定了最优配方,并考察了最优配方缓蚀阻垢剂的性能及其缓蚀阻垢机理。结果表明:最优配方为EDTMPS与咪唑啉质量比3∶1,此配方对CaCO3垢的阻垢率为91.3%,对CaSO4垢的阻垢率为98.8%,对BaSO4垢的阻垢率为46.5%,缓蚀率为76.6%;复配缓蚀阻垢剂对CaCO3垢的阻垢性随着加入量的增多、溶液中Ca2+含量的减少、试验温度的降低而上升。     

新型复合铜缓蚀阻垢剂DG3的研究

用电化学方法和失重法研究了一种以缓蚀剂DG1、BTA和阻垢剂PBTCA复配而成的复合缓蚀阻垢剂DG3对锡黄铜的缓蚀作用,并用鼓泡法研究了其阻垢性能。通过实验确定了最佳配方:DG1浓度为2mg/L,BTA浓度为3mg/L,PBTCA浓度为5mg/L。研究表明:这种缓蚀阻垢剂有优良的缓蚀和阻垢性能,锡黄铜在加有DG3的70°C淡水中腐蚀速度为0.0021mm/a,达到且优于国标允许的锡黄铜腐蚀速度(0.005mm/a),而且DG3对缝隙腐蚀也有良好的抑制作用。DG3的阻垢效果与PBTCA相比没有明显降低,30℃时DG3能使淡水中234.04mg/L的钙离子稳定存在,同30℃时5mg/L PBTCA的阻垢能力相当。     

20钢在含甲醇污水中的缓蚀剂选择及其缓蚀性能

为了减缓甲醇回收系统的腐蚀,通过失重法对20钢在含甲醇模拟污水中的缓蚀剂进行了筛选及优化,并通过极化曲线法研究了缓蚀剂的缓蚀性能;通过能谱(EDS)分析和阻垢性能试验研究了缓蚀剂的阻垢性能。结果表明:聚磷酸钠、有机膦A和ZnCl_2以质量比2∶1∶2复配,且该复合缓蚀剂用量为90mg/L时,缓蚀性能最好,缓蚀率达到95.47%;该复合缓蚀剂是抑制电极阳极反应为主的混合型缓蚀剂;含磷缓蚀剂在20钢表面形成膜从而有效地阻挡了腐蚀介质对基体的腐蚀,且该复合缓蚀剂具有较好的阻垢作用,阻垢率达83.33%.     

90℃下CO2-H2O介质中气/液双效缓蚀剂的研制

本文设计合成了一种成膜型的氮杂环的季胺盐缓蚀剂9912-l，用挂片失重法测试了其在90℃下，CO2饱和的3％NaCl水溶液中对碳钢的缓蚀性能，探讨了缓蚀剂用量对缓蚀率的影响，以及在气-液两相中该缓蚀剂与复配物的协同效应，得出效果良好的气／液双效缓蚀剂，在气、液相中的缓蚀率分别达到93．89％利95．68％。     

油田缓蚀剂阻垢剂筛选及复配室内研究

针对油田生产过程中严重的腐蚀结垢问题,通过挂片法和电化学法对几种缓蚀剂的缓蚀效果进行评价;通过滴定法对阻垢剂的阻垢效果进行评价;并将性能优良的缓蚀剂与阻垢剂进行复配实验.结果表明:956和FHH-02两种缓蚀剂缓蚀率达90%;1320C和BHF-06两种阻垢剂阻垢率达90%;1320C阻垢剂与956和FHH-02缓蚀剂有很好的配伍性;并且1320C阻垢剂与956和FHH-02缓蚀剂复配使用的缓蚀效果和1320C阻垢剂与FHH-02缓蚀剂复配使用的阻垢效果都很理想.     

磺胺嘧啶和硫氰酸钠在硫酸介质中对Q235钢的缓蚀协同作用

以磺胺嘧啶(SD)和硫氰酸钠(NaSCN)在0.5 mol/L硫酸介质中对Q235钢的缓蚀作用为研究对象,采用失重法、极化曲线法、扫描电子显微镜表征等方法研究了两者复配的协同缓蚀行为及吸附模型,并通过均匀设计实验获得了复配缓蚀剂的最佳配方。结果表明:磺胺嘧啶及其复配物均为混合型缓蚀剂,都符合Langmuir等温吸附模型;复配后两种缓蚀剂之间的协同效应明显,吸附热力学和动力学参数明显改善,缓蚀率显著提高。扫描电子显微镜测试结果显示,磺胺嘧啶复配后钢表面腐蚀程度明显降低,由局部腐蚀为主转换为均匀腐蚀为主。均匀设计试验获得的复配缓蚀剂最佳配方为:磺胺嘧啶1200 mg/L、NaSCN 960 mg/L,缓蚀率高达92.65%。     

循环冷却水阻垢缓蚀剂的研制

以攀枝花某电厂循环冷却水阻垢缓蚀剂的复配为例,从缓蚀阻垢剂成分的确定、配方的筛选,以及选定配方的动态稳定、污垢热阻试验.得出了以阻垢为主的有机膦低磷系列的高效、环保、低处理费用的缓蚀阻垢剂 DS - 5（90 mg/L）.配方在运行2个月内的阻垢率在85%、缓蚀率在80%以上,污垢热阻稳定在0.32×10-4 m2•h•℃/kJ,达到国家标准.与原有配方相比,处理后冷却水含磷(PO52-计)由8 mg/L降为4 mg/L,年处理费用降低23%.     

90℃下C0_2-H_20介质中气/液双效缓蚀剂的研制

本文设计合成了一种成膜型的氮杂环的季胺盐缓蚀剂9912-1,用挂片失重法测试了其在90℃下,C02饱和的3%NaCl水溶液中对碳钢的缓蚀性能,探讨了缓蚀剂用量对缓蚀率的影响,以及在气-液两相中该缓蚀剂与复配物的协同效应,得出效果良好的气/液双效缓蚀剂,在气、液相中的缓蚀率分别达到93.89%利95.68%。     

固定化溶菌酶的缓蚀机理及性能

采用物理吸附方法将溶菌酶固定在MCM-41介孔分子筛上,并与化学缓蚀剂[氨基三亚甲基膦酸(ATMP)与聚天冬氨酸(PASP)]复配用作循环冷却水缓蚀剂。利用电化学法分析复配缓蚀剂的缓蚀机理,并用失重法所测得的复配缓蚀剂缓蚀性能为指标优化复配条件。结果表明:复配缓蚀剂为混合型缓蚀剂,可以同时抑制腐蚀过程的阴极反应与阳极反应,最佳复配方案为固定化溶菌酶投加量0.7g/L、ATMP质量浓度10mg/L、PASP质量浓度20mg/L,缓蚀率可达88.55%,循环冷却水对碳钢腐蚀速率降至0.017 3mm/a,作用时间为11~13d。     

缓蚀剂9912—1在CO2—H2O介质中缓蚀性能的研究

设计合成了一种成膜型的氮杂环的季胺盐缓蚀剂9912－1。测试了其在90度下二氧化碳饱和的3％NaCl水溶液中对碳钢的缓蚀性能,探讨了缓蚀剂用量与缓蚀率的关系,及其与复配物的协同效应,从中得出了较佳的缓蚀配方。实验结果表明,此种缓蚀剂对碳钢有良好的缓蚀效果,可作为中高温条件下CO2环境中的缓蚀剂。     

油田采出水处理复合阻垢缓蚀剂的研究

目的制备一种高效、复合型的油田采出水处理阻垢缓蚀剂。方法以二己烯三胺五亚甲基膦酸、磺酸基共聚物和钨酸钠为原料复配成复合阻垢缓蚀剂,通过静态阻垢试验和动态腐蚀试验,研究复合阻垢缓蚀剂的防垢和缓蚀效果与其质量浓度的关系,考察絮凝剂、杀菌剂及缓蚀剂等水处理剂对防垢效果的影响。结果在油田采出水处理中,阻垢缓蚀剂最佳质量浓度为30 mg/L,此时的阻垢率>95%,腐蚀速率为0.0696 mm/a。油田采出水中过量的絮凝剂及季铵盐1227杀菌剂会造成阻垢率降低,咪唑啉缓蚀剂对阻垢率有增效作用,异噻唑啉酮杀菌剂对阻垢率影响较小。结论该复合阻垢缓蚀剂生产制备简单,阻垢和缓蚀性能优良。     

Copper corrosion inhibition by polyaspartic acid and imidazole

This work reveals the corrosion inhibition effect of polyaspartic acid (PASP) and imidazole (IM) on copper in 3 wt% aminosulfonic acid acting as mixed‐type inhibitor of predominant cathodic effect. Potentiodynamic polarization and electrochemical impedance spectroscopy work prove that at 30 °C, 1.0 g/L PASP alone gave the best inhibitory effect of 89.8%; the inhibition efficiency could reach up to 95.4% when combining PASP and IM at the same ratio in total of 1.0 g/L. The anti‐corrosion mechanism of PASP and IM on copper is proposed from the characteristic molecular structures of these two chemicals.     

Polyaspartic acid as a green corrosion inhibitor for carbon steel

The inhibitor effect of the environmentally friendly corrosion inhibitor polyaspartic acid (PASP) on the corrosion of carbon steel in 0.5 M H₂SO₄ was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). Polarization curve results clearly reveal the fact that PASP is a good anode‐type inhibitor. EIS results confirm its corrosion inhibition ability. The inhibition efficiency increases with increasing PASP concentration, and the maximum inhibition efficiency was 80.33% at 10 °C. SEM reveals that a protective film forms on the surface of the inhibited sample. The adsorption of this inhibitor is found to follow the Freundlich adsorption isotherm. A mechanism is proposed to explain the inhibitory action of the corrosion inhibitor.     

聚天冬氨酸及其衍生物的缓蚀性能和生物降解性能

在聚琥珀酰亚胺的基础上分别合成了含单羟基、双羟基、羧基、磺酸基四种基团的聚天冬氨酸(PASP)衍生物,采用静态失重法和电化学腐蚀法对其缓蚀性能进行了研究。试验结果表明,这几种聚天冬氨酸衍生物都是以抑制阳极为主的缓蚀剂,其中接枝双羟基的衍生物(DHPAP)的缓蚀效果最好,当加药量为100mg.L-1时缓蚀率达到92.8%,比聚天冬氨酸提高了50%以上。PASP、PASP-ASP(含羧基)在20天内的生物降解率在60%以上,具有优良的生物降解性,而PASP-SEA(含磺酸基)、HPAP(含单羟基)、DHPAP(含双羟基)属于可生物降解物质。     

Influence of pH on corrosion behavior of carbon steel in simulated cooling water containing scale and corrosion inhibitors

In this paper, the influence of pH on the corrosion behavior of AISI 1020 carbon steel in simulated cooling water was investigated by using electrochemical and surface analysis methods. The results of polarization showed that the corrosion resistance of carbon steel increased with an increase in pH of the simulated water, and the corrosion control process changed from cathodic polarization to anode polarization control. The scale and corrosion inhibitor 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) had a certain anodic corrosion inhibition effect on carbon steel, whereas Zn²⁺ acted as a cathodic inhibitor for carbon steel in simulated water with pH 7–9. In simulated water containing both PBTCA and Zn²⁺, a good synergistic corrosion inhibition was found between PBTCA and Zn²⁺, and their corrosion inhibition effect on carbon steel was the best at pH 8. This was attributed to the formation of Zn(OH)₂ precipitate film in the cathode region and the formation of Zn–PBTCA complex film in the anode region at this pH.     

酸性体系中聚天冬氨酸对碳钢的缓蚀作用初探

用电化学方法研究了在酸性环境中聚天冬氨酸(PASP)对45#碳钢的缓蚀作用及影响因素。结果表明:PASP具有一定的缓蚀保护作用;缓蚀效率随添加PASP浓度增加而增大;当PASP含量达到10 g/L时,缓蚀效率的增加趋势相对稳定,添加PASP 50 g/L时缓蚀效率达到80%以上;碳钢在介质中的浸泡时间、环境温度和碳钢基材表面状态均可影响PASP的缓蚀效果。     

聚(柠檬酸-天冬氨酸)的合成及其阻垢缓蚀性能

采用热缩聚法制备了聚(柠檬酸-天冬氨酸),并用红外光谱和凝胶色谱对其进行了表征。采用静态阻垢法研究了不同条件下制备的聚(柠檬酸-天冬氨酸)对硫酸钙的阻垢性能。采用电化学方法研究了在3.5%(质量分数)氯化钠溶液中聚(柠檬酸-天冬氨酸)对铜的缓蚀性能。结果表明:当天冬氨酸与柠檬酸物质的量之比为1∶1时,制备的聚(柠檬酸-天冬氨酸)(产物C)对硫酸钙的阻垢性能最好,阻垢率达97%,其在3.5%氯化钠溶液中对铜的缓蚀效果也很好。当产物C质量浓度为200mg/L时,对铜的缓蚀率可达81.6%。即制备的聚(柠檬酸-天冬氨酸)具有良好的阻垢缓蚀性能。     

衣康酸改性聚环氧琥珀酸的合成及其阻垢缓蚀性能的研究

目的为了拓宽聚环氧琥珀酸(PESA)的应用范围,合成了衣康酸改性聚环氧琥珀酸衍生物(IA-PESA),拟提高PESA的阻垢缓蚀性能。方法用顺酐合成环氧琥珀酸(ESA)和聚环氧琥珀酸(PESA),再利用ESA与衣康酸(IA)聚合制得IA-PESA,研究了IA-PESA的阻垢和缓蚀等综合性能。用FT-IR对PESA和IA-PESA进行表征。用黏度法测定了PESA和IA-PESA的分子量。结果在静态阻垢实验中,对CaCO_3阻垢率达到90%以上,对CaSO_4阻垢率高达95%,甚至100%。IA-PESA分散Fe(Ⅲ)和稳定Zn~(2+)性能明显好于PESA。在静态失重实验中,当IA-PESA与PESA的用量均为150 mg/L时,加IA-PESA的腐蚀速率明显小于加PESA的腐蚀速率。对钙垢和腐蚀试片的SEM研究表明,IA-PESA使致密度较高、晶格结构规整的CaCO_3和CaSO_4钙垢改变为致密度较低、疏松、形状不规整的晶型结构。IA-PESA使试片未发生均匀腐蚀和点蚀,表面光滑。结论在相同测试条件下,IA-PESA的阻垢、缓蚀、分散Fe(Ⅲ)和稳定锌性能都好于PESA,改变了设备表面钙垢的晶型结构,减少了垢下腐蚀,缓蚀作用明显。     

Influence of iron microstructure on the performance of polyacrylic acid as corrosion inhibitor in sulfuric acid solution

The corrosion inhibition behavior of bulk nanocrystalline ingot iron (BNII) fabricated from coarse polycrystalline ingot iron (CPII) by severe rolling technique by polyacrylic acid (PAA) was studied in 0.1 M H₂SO₄ using electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The results indicated that PAA inhibited the acid induced corrosion of both iron specimens, with greater effect noted for BNII. The corrosion inhibiting effect was influenced by the microstructure of the iron samples. Synergistic inhibition effect was observed on addition of iodide ions to PAA in case of CPII while for BNII inhibition efficiency marginally increased.