水溶性聚苯胺纳米粒子对碳钢的缓蚀作用

采用分散聚合法合成了水溶性聚苯胺(PANi)纳米粒子,并利用红外光谱、电子扫描电镜和激光粒度仪观察该聚合物的结构和粒径分布。采用极化曲线和电化学阻抗谱研究该水溶性聚苯胺纳米粒子对碳钢在1mol/L HCl溶液中的缓蚀作用。结果表明:聚苯胺纳米粒子可在碳钢表面吸附成膜,从而有效降低其腐蚀速率,当缓蚀剂的质量浓度为0.5g/L时,缓蚀率达到95.6%。     

缓蚀水溶性聚苯胺的性能及聚合工艺的研究

采用苯胺及其衍生物进行共聚制备缓蚀水溶性聚苯胺,用腐蚀浸泡失重法研究了苯胺衍生物比例、单体浓度、氧化剂浓度、酸度、反应温度及时间对其缓蚀性能的影响。研究结果表明,苯胺衍生物比例、单体浓度、氧化剂浓度、酸度、反应温度对缓蚀水溶性聚苯胺的缓蚀性能都具有较大的影响,而反应时间对聚合产物的缓蚀性能没有显著影响。     

ATA及其与PASP复配在3.5%NaCl溶液中对碳钢的缓蚀作用

为寻找新的缓蚀荆来解决碳钢的腐蚀问题,采用极化曲线和交流阻抗方法,研究了3-氨基-1,2,4-三氮唑(ATA)及其与聚天冬氨酸(PASP)复配在3.5%NaCl溶液中对碳钢的缓蚀作用,并对比观察了碳钢在未加和加入复配缓蚀荆的3.5%NaCl溶液中浸泡后的腐蚀形貌.结果表明:ATA在3.5%NaCl溶液中对碳钢具有缓蚀作用,属阳极型缓蚀剂,其添加量以25 mg/L为最好,此时的缓蚀效果最佳,缓蚀率可达93.51%;ATA和PASP复配在3.5%NaCl溶液中对碳钢具有缓蚀协同作用,且15 mg/L ATA和10 mg/L PASP复配时的缓蚀协同作用最好,缓蚀率高达99.89%.     

壳聚糖及衍生物掺杂聚苯胺在0.5mol·L~(-1)HCl溶液中对碳钢的缓蚀性能

采用化学氧化法合成了壳聚糖掺杂聚苯胺(CTS-PANI)、羟丙基壳聚糖掺杂聚苯胺(HPCS-PANI)及羧甲基壳聚糖掺杂聚苯胺(CMC-PANI);利用红外光谱法(FTIR)对合成产物进行表征,用腐蚀试验和电化学测试研究了掺杂态聚苯胺对Q235钢在0.5mol·L~(-1) HCl溶液中的缓蚀性能。结果表明:本征态聚苯胺及掺杂态聚苯胺的缓蚀率随缓蚀剂含量的增加先增大后减小,当缓蚀剂的质量浓度达到50mg·L~(-1)时缓蚀率最大;四种缓蚀剂对Q235碳钢在0.5mol·L~(-1) HCl溶液中的缓蚀率从大到小顺序为CMC-PANIHPCS-PANICTS-PANIPANI,羧甲基壳聚糖掺杂聚苯胺的缓蚀性能最好,缓蚀率可达91.9%。     

海带提取液作为酸洗缓蚀剂的研究

用失重方法对海带提取液进行缓蚀测试,结果表明该缓蚀剂对碳钢在HCl中的缓蚀效果很好,单独使用缓蚀效果可以达到90 %以上,而且缓蚀效果受温度的影响很小     

新型固体复合缓蚀剂对20碳钢在酸洗液中的缓蚀性能研究

以固体间苯二胺、硫氰酸钾及乌洛托品为原料研制了一种新型固体复合型缓蚀剂,并利用静态失重法、Tafel极化曲线、电化学阻抗研究了其在10%HCl溶液、10%H2SO4溶液、10%HNO3溶液中对20碳钢的缓蚀行为。结果表明,在上述3种酸溶液中,添加0.5%的新型固体复合型缓蚀剂即可使20碳钢的缓蚀率全部达到80%以上,其中在10%HNO3溶液中,20碳钢的缓蚀率可以达到99.1%。Tafel极化曲线及电化学阻抗也表明该缓蚀剂的加入显著地抑制了20碳钢在酸溶液中的腐蚀速率,说明该缓蚀剂能够在20碳钢的表面形成缓蚀性能优良的保护膜。     

三聚氰胺对碳钢在 HCl 介质中的缓蚀作用

目的了解在HCl介质中,三聚氰胺对碳钢的缓蚀作用和缓蚀机理。方法在1 mol/L HCl溶液中添加不同浓度的三聚氰胺,测试碳钢在溶液中的动电位极化曲线和电化学阻抗谱,获得电化学参数和缓蚀效率。再结合量子化学计算结果,分析其缓蚀机理。结果针对碳钢在1 mol/L HCl溶液中的腐蚀,三聚氰胺是一种混合抑制型缓蚀剂,随其浓度的增加,缓蚀效率增大。三聚氰胺通过分子中Mulliken电荷相对较负的氮原子吸附在碳钢表面起到缓蚀作用,吸附过程为自发过程,以物理吸附为主,且符合Langmuir吸附等温方程。结论在HCl介质中,三聚氰胺对碳钢具有一定的缓蚀作用。     

曼尼希碱酸化缓蚀剂的合成及缓蚀性能

目前,曼尼希碱的合成多在有机溶剂中进行,其中大多有机溶剂对人体有害。以苯乙酮、甲醛、二乙胺为原料,苄基三乙基氯化铵为相转移催化剂,以水为溶剂合成曼尼希碱酸化缓蚀剂。用失重法和电化学方法考察其浓度及腐蚀液温度对20碳钢缓蚀效果的影响。结果表明:该缓蚀剂为混合型缓蚀剂,在碳钢表面的吸附为物理吸附;随温度的升高缓蚀率逐渐减小,随浓度的增加缓蚀率先增大后减小;缓蚀剂的添加量为0.7%,温度35~55℃时缓蚀率都在90%以上,能有效抑制盐酸对碳钢的腐蚀。     

低碳钢在富含H2S乙醇胺溶液中的腐蚀及缓蚀剂抑制

利用失重、腐蚀电化学方法和表面分析技术研究了碳钢在富含H2S的乙醇胺(MEA)溶液中的腐蚀行为，以及添加缓蚀剂后对其电化学行为的影响．讨论了IMC—C5缓蚀剂对该体系的缓蚀作用机理．结果表明，脱硫系统中吸收了硫化氢的乙醇胺溶液对碳钢的腐蚀十分严重，IMC—C5缓蚀剂能有效控制碳钢在该体系中的腐蚀．其缓蚀作用主要来自于吸附缓蚀剂分子对腐蚀阳极过程的抑制，为阳极吸附型缓蚀剂．     

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。     

Corrosion inhibition of mild steel by plant extract in dilute HCl medium

The inhibition effect of Zenthoxylum alatum plant extract on the corrosion of mild steel in 5% and 15% aqueous hydrochloric acid solution has been investigated by weight loss and electrochemical impedance spectroscopy (EIS). The corrosion inhibition efficiency increases on increasing plant extract concentration till 2400 ppm. The effect of temperature on the corrosion behaviour of mild steel in 5% and 15% HCl with addition of plant extract was studied in the temperature range 50-80 °C. Surface analysis (SEM, XPS and FT-IR) was also carried out to establish the corrosion inhibitive property of this plant extract in HCl solution. Plant extract is able to reduce the corrosion of steel more effectively in 5% HCl than in 15% HCl. The adsorption of this plant extract on the mild steel surface obeys the Langmuir adsorption isotherm.     

ZnCl2-induced changes in the electronic properties of polyaniline—HCl salt and its base

The effects of ZnCl₂ on the electronic properties of polyaniline—HCl salt and its base were studied for different concentrations of ZnCl₂ (0.1, 1.0, 3.0 and 6.0 M) for 1 and 5 days. The polyaniline samples were characterized by conductivity and spectroscopic measurements such as UV-Vis, FT-IR and EPR. ZnCl₂ treatment results in the degradation of the polyaniline salt and, for the polyaniline base, doping occurs depending on the concentration of ZnCl₂. The conversion of polyaniline base to polyaniline salt is less efficient in the case of ZnCl₂ doping when compared to doping with HCl. There is no significant change in the properties of polyaniline salt and base with increase in duration of ZnCl₂ treatment. The poor charge storage capacity and shelf-life of the polyaniline—zinc cell system can be understood from the present study.     

水性聚苯胺/海泡石/丙烯酸乳液复合防腐蚀涂层研究

目的研究水性聚苯胺/海泡石/丙烯酸乳液复合防腐涂层在NaCl溶液中对马口铁的防腐效果。方法采用原位化学氧化聚合方法,制备了聚苯胺/海泡石复合材料,并以丙烯酸乳液为成膜物质,制备了水性聚苯胺/海泡石/丙烯酸乳液复合防腐蚀涂层材料。通过扫描电镜和EDX对聚苯胺/海泡石复合材料的结构和形貌进行了表征。利用电化学交流阻抗谱、塔菲尔曲线和硫酸铜点滴试验,研究了海泡石/苯胺投料比、聚苯胺/海泡石复合材料用量、磷酸浓度等对复合涂层防腐性能的影响。结果扫描电镜观察显示,苯胺/海泡石复合材料具有纤维状结构。电化学测试及硫酸铜点滴试验表明,当海泡石/苯胺投料比为6:10、聚苯胺/海泡石复合材料用量为0.2%、磷酸浓度为0.1 mol/L时,其腐蚀电流密度为1.013X10~(-6)A/cm~2,腐蚀电位为-0.385V,极化电阻为14 350.8?,耐硫酸铜腐蚀时间为275 s,防腐效果最佳。结论当海泡石/苯胺投料比为6:10、聚苯胺/海泡石复合材料用量为0.2%、磷酸浓度为0.1 mol/L时,水性聚苯胺/海泡石/丙烯酸乳液复合防腐涂层对马口铁具有最佳的防腐效果。     

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。     

Preparation,FTIR spectroscopic characterization and isothermal stability of differently doped fibrous conducting polymers based on polyaniline and nylon-6,6

The fibrous conducting polymers based on polyaniline and nylon-6,6 are obtained by stirring with magnetic bar. The increase in the ratio of conducting polymer volume in case of such fibers make them attractive materials for potential applications. As it is difficult directly to form fibers of conducting polymers, stirring process is attempted to form fibers of conducting polyaniline and nylon-6,6. In the present paper, the fibrous polyaniline:nylon-6,6 (PANI:Ny-6,6) with different weight percentages (5–20%, w/w) are prepared by stirring process. The fibers obtained are characterized using Fourier-transform infrared spectra (FTIR) and scanning electron microscopy (SEM), the variation of electrical conductivity with different type doping agents 0.1 M (HCl, H₂SO₄ and HClO₄) and the stability in terms of DC electrical conductivity retention was studied in an oxidative environment by isothermal characteristics.     

Template synthesis of polyaniline in the presence of phosphomannan

The synthesis of a water-soluble and conducting polyaniline (PANI)–phosphomannan (PMa) complex is presented. Chemical polymerization of aniline was carried out in the presence of PMa, a novel polymeric phosphoric acid and a kind of biomaterial. It was found that the extent of polymerization was affected greatly by initial molar ratio of aniline to PMa in reaction media. A water-soluble and conducting PANI–PMa complex has been obtained under suitable conditions and it exhibited a maximum conductivity by appropriate control of molar ratio of aniline to PMa. The synthesized PANI was characterized by UV–VIS, Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA) and inherent viscosity. TGA showed that PANI–PMa complex has highly thermal stability, which was also confirmed by conductivity measurement after exposing the casting films at high temperature.     

硫脲对非调质钢在HCl酸洗溶液中的缓蚀作用

目的 研究硫脲(TU)对非调质钢在HCl溶液中的缓蚀作用.方法 通过动电位极化曲线、电化学阻抗谱研究硫脲对非调质钢在HCl溶液中的缓蚀效应,采用KH-7700型三维视频显微镜观察非调质钢的腐蚀形貌.结果 非调质钢在不合缓蚀剂的HCl溶液中的自腐蚀电位(Ecorr)为-0.566V,自腐蚀电流密度(Jcorr)为12.57 mA/cm2.随着HCl溶液中硫脲浓度的增加,非调质钢的自腐蚀电流密度(Jcorr)逐渐减小,反应电阻(Rct)逐渐增大,界面双电层电容Cdl降低,缓蚀效率逐渐增加,阴极极化曲线几乎重合,而阳极极化曲线逐渐正移.当HCl溶液中加入5g/L硫脲时,缓蚀效率达91.17％,效果好于市售酸洗缓蚀剂AS-30,能够有效消除非调质钢在HCl酸洗液中的腐蚀麻点.结论 硫脲对非调质钢在HCl溶液中具有明显的缓蚀效应,能够有效消除非调质钢酸洗过程中的腐蚀麻点.     

Preparation,FTIR spectroscopic characterization and isothermal stability of differently doped conductive fibers based on polyaniline and polyacrylonitrile

Conductive fibers based on polyaniline (PANI) and polyacrylonitrile (PAN) were obtained by stirring with magnetic bar. This research was conducted to investigate conducting fibers of polyaniline:polyacrylonitrile (PANI:PAN) composite with different weight ratios of aniline in PAN matrix. The fibers were prepared by stirring process. The best conductivity behavior of the fibers was obtained with 5 mL of aniline. The fibers obtained were characterized using Fourier-transform infrared spectra (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The variation of electrical conductivity with different type doping agents (HCl, H₂SO₄ and HClO₄) and the stability in terms of DC electrical conductivity retention was studied in an oxidative environment by isothermal characteristics.     

月桂酰两性基二乙酸二钠的缓蚀性能增效研究

目的研究KI和硫脲对月桂酰两性基二乙酸二钠的缓蚀增效作用。方法首先以静态挂片失重法测定三乙醇胺、乙二胺四甲叉膦酸钠(EDTMPS)、月桂酰两性基二乙酸二钠(M)三种缓蚀剂的缓蚀性能,筛选出缓蚀效果最好的月桂酰两性基二乙酸二钠作为复合缓蚀剂的主要成分,然后对月桂酰两性基二乙酸二钠进行复配增效实验,并采用3D激光共聚焦显微镜对腐蚀过后的挂片表面形貌进行观察,采用EDS及SEM对挂片表面上形成的腐蚀产物膜进行表征。结果当KI和月桂酰两性基二乙酸二钠的质量比为1:5时(M5K),缓蚀率提高了7%,腐蚀速率降低了0.0105 mm/a,缓蚀效果最佳;当硫脲与月桂酰两性基二乙酸二钠以1:10的比例进行复配时(M10S),缓蚀率提高5.8%,腐蚀速率降低0.0114mm/a,此时的缓蚀效果略低于M5K。结论在特定的比例下,KI和硫脲对月桂酰两性基二乙酸二钠的缓蚀性能均有一定的增效作用。KI是增加其吸附性能,而硫脲则是产生鳌合作用,这为两性咪唑啉的缓蚀性能增效研究提供了一定的参考。     

FBE与聚苯胺粉末共混涂层的防腐蚀性能

以苯胺为单体,过硫酸铵为氧化剂,采用超声波辅助的化学氧化法合成了聚苯胺,自制的聚苯胺与熔结环氧粉末(FBE)混合均匀后,用静电喷涂法在Q235钢上制备涂层。采用电化学阻抗谱(EIS)技术研究涂层在模拟海水中不同浸泡时期的防腐蚀性能。结果表明,聚苯胺粉末的加入提高了FBE涂层的防腐蚀性能,且加入量较少时,涂层的耐腐蚀性能随着聚苯胺含量的增加而增强,当质量分数达到5%时效果最好;在达到10%后,涂层中没有足够的粘结剂来填充聚苯胺之间的空间,使涂层多孔,防腐蚀性能变差。