绿色水处理剂聚天冬氨酸缓蚀协同效应的研究

聚天冬氨酸（PASP）是一种新型的绿色生物可降解缓蚀阻垢剂。该文用失重法研究了聚天冬氨酸对碳钢的缓蚀性能以及与HEDP、锌盐的缓蚀协同效应。研究表明。聚天冬氨酸、HEDP、锌盐在自来水中对碳钢具有良好的缓蚀协同效应。     

改性聚天冬氨酸的缓蚀性能及机理研究

通过傅立叶红外光谱、旋转挂片法、极化曲线法、交流阻抗法研究了醇胺开环改性聚天冬氨酸的缓蚀性能及缓蚀机理。研究表明,乙醇胺、二乙醇胺、三乙醇胺开环改性PASP中以加入乙醇胺所得改性产物的缓蚀性能最好,缓蚀率达到70.18%。醇胺改性的PASP是一种以抑制阳极为主的缓蚀剂。     

四元海水缓蚀剂的缓蚀性能研究

四元海水缓蚀剂由聚天冬氨酸(PASP)、葡萄糖酸钠、七水硫酸锌与2-羟基膦酰基乙酸(HPAA)复配制得.利用失重法和电化学法研究了缓蚀剂在海水中对A3碳钢的缓蚀性能.结果表明,当缓蚀剂的用量为100 mg/L时,其缓蚀率大于94％,该缓蚀剂是一种抑制阳极腐蚀为主的缓蚀剂,在海水中具有优良的缓蚀性能.     

硫酸介质中甘氨酸复合缓蚀剂的研究

以硫酸介质为研究体系,采用极化曲线法和电化学交流阻抗法研究不同浓度的甘氨酸以及甘氨酸与不同浓度的碘化钾溶液复配后对碳钢的缓蚀性能。实验证明,甘氨酸在10%H_2SO_4溶液中对碳钢具有缓蚀性能,但是缓蚀效率仅为26.98%。而甘氨酸与碘化钾复配后,缓蚀能力明显提高,当甘氨酸的浓度为300 mg/L,碘化钾的浓度为350 mg/L时缓蚀效果最好,缓蚀效率达84.97%。甘氨酸与碘化钾复配后的缓蚀剂属于混合型缓蚀剂,在碳钢表面的吸附是自发进行的,满足El-Awady动力学模型,为多分子层吸附。     

环境友好型多功能海水缓蚀剂的研制及性能研究

为同时解决碳钢与铜材在海水中的腐蚀问题,将聚天冬氨酸、苯并三唑等5种原料按一定的质量比复配成多功能海水缓蚀剂。利用失重法和电化学法研究了海水缓蚀剂在海水中对A3碳钢及H62黄铜的缓蚀性能。结果表明,当海水缓蚀剂用量为150 mg/L时,对碳钢与黄铜在海水中的腐蚀均有良好的抑制作用,碳钢缓蚀率达到95.17%,黄铜缓蚀率达到93.67%。该海水缓蚀剂具有优良的生物降解性能,28 d后生物降解率达到82.6%。     

电厂循环水绿色水处理剂阻垢缓蚀性能的研究

采用静态阻垢法、静态挂片法、极化曲线法对绿色水处理剂聚天冬氨酸和聚环氧琥珀酸的缓蚀阻垢性能进行了研究,初步探讨了其缓蚀阻垢机理。通过静态阻垢实验结果可知,聚环氧琥珀酸的阻垢性能好于聚天冬氨酸(PASP),当聚环氧琥珀酸(PESA)和PASP质量浓度达到8mg/L之后阻垢率基本维持在一个水平;通过静态挂片实验结果可以看出PASP的最佳质量浓度为50mg/L,PESA的最佳质量浓度为40mg/L;通过极化曲线法可知PASP和PESA均属于抑制阳极型水处理剂。     

环境友好型海水缓蚀剂的研制及性能研究

环境友好型海水缓蚀剂由聚天冬氨酸(PASP)、硫酸锌、葡萄糖酸钠与2-羟基膦酰基乙酸(HPAA)复配制得,通过正交试验确定最佳复配质量比为4:5:8:0:5。利用失重法、电化学法和扫描电镜法研究了此四元海水缓蚀剂在海水中对A3碳钢的缓蚀性能。结果表明,当海水缓蚀剂的用量为90 mg/L时,缓蚀率达到97.26%,有效抑制了碳钢在海水中的腐蚀。该海水缓蚀剂具有优良的生物降解性能,28 d的生物降解率达到85.65%。     

聚天冬氨酸的改性对阻垢分散性能的影响

将聚琥珀酰亚胺(PSI)与天冬氨酸(ASP)、2-氨基乙磺酸(SEA)分别进行反应,对聚天冬氨酸进行改性,并对改性聚天冬氨酸的阻CaCO3垢、分散Fe2O3和缓蚀性能进行了评定。实验结果表明:在PASP分子结构中引入羧基可以提高其阻垢率,而磺酸基的引入则会降低其阻垢率,当引入羧基的改性聚天冬氨酸质量浓度为6mg/L时,阻垢率达到了100%;磺酸基的引入可以大大提高聚天冬氨酸的分散性能,加药质量浓度为10mg/L,分散Fe2O3时上清液最小透光率为40.3%;羧基的引入有助于缓蚀性能的提高,加药质量浓度为100mg/L时,比PASP的缓蚀率提高35%以上。     

环境友好型聚天冬氨酸水处理剂配方研究

针对聚天冬氨酸(PASP)及其四元复合配方的阻垢缓蚀性能进行研究。聚天冬氨酸具有缓蚀和阻垢双重功能,但用做缓蚀剂时用量较大(100 mg/L)。为了降低成本,对聚天冬氨酸、苯并三氮唑(BTA)、钨酸钠和葡糖酸钠进行四元复配研究,通过正交试验得到最佳配比:PASP∶BTA∶钠钨酸钠∶葡萄糖酸钠是10∶0.5∶20∶10(总浓度为40.5 mg/L),该配方对铜的阻垢率和缓蚀率分别为99.22%和0.000 6 mm/a,具有较好的阻垢缓蚀效果。     

复配聚天冬氨酸对不同条件模拟水中铜的缓蚀作用

用交流阻抗法和极化曲线法,以模拟水溶液为介质,通过电化学谱图研究了两种环境友好型水处理药剂聚天冬氨酸和钨酸钠的复配对纯铜的缓蚀作用,同时通过改变模拟水介质条件研究复配聚天冬氨酸对铜的缓蚀效果。研究表明,聚天冬氨酸和钨酸钠复配后对模拟水中的铜有明显的缓蚀效果,在缓蚀剂总质量分数为16×10-6,聚天冬氨酸与钨酸钠的质量比为1∶1时,对铜的缓蚀效果最佳,其缓蚀效率为90.50%。当模拟水体系的温度升高、pH增大、氯离子含量增加及硫离子浓度增加时,都会使复配缓蚀剂对铜的缓蚀效果变差。     

烯丙基硫脲对金属材料在盐酸中的缓蚀性能研究

文章通过静态失重法和电化学法对缓蚀剂烯丙基硫脲在盐酸体系中对金属材料的缓蚀性能进行了研究。分别考察了不同缓蚀剂浓度、挂片温度及不同金属材料等情况下烯丙基硫脲的缓蚀性能。结果表明,烯丙基硫脲对Q235碳钢的缓蚀性能较好,失重法实验结果表明,在20℃下,0.5 mol/L盐酸溶液中加入100 ppm烯丙基硫脲对不锈钢的缓蚀率可达93%;0.5 mol/L盐酸溶液中加入50 ppm烯丙基硫脲对Q235碳钢的缓蚀率可达94%。电化学法实验结果则表明,当烯丙基硫脲浓度达到1000 ppm时,对不锈钢的缓蚀率达到97%,对Q235碳钢的缓蚀率可达98%。     

Corrosion inhibition performance of threonine-modified polyaspartic acid for carbon steel in simulated cooling water

Green polymers as corrosion inhibitors are gradually used to protect metal in solution environment. A polyaspartic acid threonine derivative (PASP-Thr) was synthesized and its structure was characterized by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance. The corrosion inhibition effect of polyaspartic acid (PASP) and PASP-Thr on carbon steel in simulated cooling water was investigated by weight loss tests and electrochemical measurements. Experimental results show PASP-Thr as a mixed-type inhibitor exhibits higher corrosion inhibition efficiency than PASP, and the inhibition efficiency of PASP-Thr reached 93.06% at the dosage was 200 mg L⁻¹. The carbon steel surface in different situations was analyzed using atomic force microscope, scanning electronic microscope/energy dispersive X-ray, and FTIR, demonstrates the formation of a protective film on carbon steel surface. The inhibition effect of PASP-Thr was primarily attributed to the protective film formed on steel surface by physical and chemical adsorption. Moreover, quantum chemical calculation elaborated the relationship between the inhibition efficiency and the PASP-Thr molecular structure. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47242.     

大蒜硫酸提取液缓蚀作用研究

文章采用电化学方法,研究了用硫酸浸泡大蒜法提取的缓蚀剂对碳钢在酸洗溶液中的缓蚀作用。考察了大蒜质量分数和酸浓度对缓蚀效果的影响,实验结果表明,该大蒜提取物在酸性介质中有良好的缓蚀作用,缓蚀效率达96%以上。     

多功能酸洗缓蚀剂缓蚀效果的研究

对威海翔宇环保科技股份有限公司研发的多功能酸洗缓蚀剂进行了盐酸酸洗、H_2SO_4酸洗、硝酸酸洗缓蚀实验,实验结果表明,多功能酸洗缓蚀剂在盐酸酸洗、H2SO4酸洗、硝酸酸洗过程中对碳钢、16mn钢都有很好的缓蚀效果,加药浓度不同,缓蚀效果不同。多功能酸洗缓蚀剂的加药浓度一般在3‰~5‰,10%的盐酸酸洗的缓蚀率可达到98.8%、10%的H_2SO_4酸洗的缓蚀率可达到99.8%、10%的硝酸酸洗的缓蚀率可达到77%以上。     

离子液体在甲醇/硫酸介质中对Q235钢表面的缓蚀性能

探究硫酸存在时Q235钢在甲醇中的腐蚀行为,以及离子液体1-丁基-3-甲基咪唑氯盐([Bmim]Cl)对金属表面的缓蚀作用。通过静态失重法、电化学测试、扫描电子显微镜来测定[Bmim]Cl对Q235钢的缓蚀性能。并利用量子化学计算和分子动力学模拟分析[Bmim]Cl分子的缓蚀机理。在甲醇中随着硫酸含量的增加碳钢的腐蚀速率增加。含有59.51 ml 0.05 mol·L^-1H₂SO₄的甲醇溶液作为腐蚀介质时,随着[Bmim]Cl浓度升高,缓蚀效率逐渐增大,当浓度为0.6 mol·L^-1时,缓蚀效率达到最佳值,为90.63%,且[Bmim]Cl是主要控制阳极反应的混合抑制剂,SEM分析表明在含有缓蚀剂溶液中浸泡后的Q235钢表面相对于未加缓蚀剂更加平整。前线轨道分析和Fukui指数都表明,离子液体在碳钢表面的吸附位点分布在咪唑环上,与Fe发生化学吸附。分子动力学模拟结果表明缓蚀剂分子以阳离子[Bmim]⁺平行吸附于金属表面,阴离子Cl^-扩散在溶液中的方式达到缓...     

聚天冬氨酸对A3钢的缓蚀作用机理研究

文章采用失重法研究了表面活性剂聚天冬氨酸对A3钢酸溶液中的缓蚀作用,详细考察了缓蚀剂质量浓度和温度对缓蚀性能的影响。结果表明:聚天冬氨酸对A3钢在0.5 mol/LH2SO4溶液中具有良好的缓蚀作用,缓蚀率随缓蚀剂质量浓度的增加而增大,但随温度和盐酸浓度的增加而减小。通过Langmuir和Van’t Hoff公式分别求出了相应的热力学参数,并根据这些参数讨论了聚天冬氨酸的缓蚀行为。     

用线性极化法研究碳钢在几种酸性介质中的腐蚀行为

采用线性极化法评价碳钢分浓硫酸、氢氟酸及其混酸中的腐蚀情况,讨论了不同酸性介质中温度、浓度对线性极化电阻Rp的影响规律.研究结果表明:混酸会加重碳钢的腐蚀;碳钢在70%H2SO4 20%HF中Rp最小;单组分的H2SO4、HF中,碳钢的Rp都随着温度的增加而减小;H2SO4的浓度对碳钢的腐蚀有较大的影响.     

Inhibition of mild steel corrosion in the presence of fatty acid triazoles

The influence of some fatty acid triazoles namely, 4-Phenyl-5-undecyl-4H- [1,2,4] triazole-3-thiol (PUTT), 5-Heptadec-8-enyl-4-phenyl-4H- [1,2,4] triazole-3-thiol (HPTT), and 5-Dec-9-enyl-4-phenyl-4H- [1,2,4] triazole-3-thiol (DPTT) on the corrosion of mild steel in 1 M hydrochloric acid (HCl) and 0.5 M sulfuric acid (H₂SO₄) was studied by weight loss and potentiodynamic polarization methods. The values of activation energy and free energy of adsorption of all the triazoles were calculated to investigate the mechanism of corrosion inhibition. The potentiodynamic polarization studies were carried out at room temperature, according to which all the compounds were mixed type inhibitors and inhibit the corrosion of mild steel by blocking the active sites of the metal. The adsorption of all the triazoles on mild steel surface in both the acid solutions was found to obey the Langmuir adsorption isotherm. All the compounds showed good inhibition efficiency in both acids. The inhibition efficiency of the compounds was found to vary with their nature and concentration, solution temperature and immersion time. Electrochemical impedance spectroscopy was also used to investigate the mechanism of the corrosion inhibition.     

Electrochemical study on the effect of bipyridine dicarboxylic acid and its cobalt complex on the corrosion behaviour of carbon steel in acidic medium

The 2,2′-bipyridine-3,3′-dicarboxylic acid (bida) and its cobalt complex (Co-bida) were tested as corrosion inhibitors for N80 carbon steel in sulphuric acid solution by electrochemical polarization and electrochemical impedance spectroscopy method. The results indicate that the complex and ligand inhibit the corrosion of mild steel in H₂SO₄ solutions and the extent of inhibition increases with inhibitor concentration and decreases with temperature. The inhibition efficiency of the inhibitors follows the trend Co-bida > bida. A mixed-inhibition mechanism is proposed for the inhibitive effects of the compounds. The adsorption characteristics of the inhibitors were approximated by Temkin isotherm. Morphological study of the carbon steel electrode surface was undertaken by scanning electron microscope and the interfacial species formed on the surface in the presence of inhibitors analyzed by infrared spectroscopy.