共查询到19条相似文献,搜索用时 109 毫秒
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用失重法研究了N-甲基-2-巯基咪唑(MMI)在5%盐酸中对铜的酸洗缓蚀性能.探讨了温度和MMI浓度对缓蚀效果的影响,从中得出了MMI在铜表面的吸附等温式,计算了吸附热及MMI的加入对铜在盐酸中腐蚀反应活化能的影响,进而探讨了MMI对铜缓蚀作用的机理.结果表明, 30 ℃下,在5%盐酸中,当MMI的浓度在3 mmol•L-1和8 mmol•L-1之间时,缓蚀率随MMI浓度的增加而迅速增加,当浓度达到8 mmol•L-1时,缓蚀率趋于定值,而当浓度小于3 mmol•L-1时, MMI的加入会加速铜的腐蚀;吸附在铜表面的MMI分子间的作用力整体表现为引力; MMI在铜表面的吸附是吸热反应; MMI的加入降低了铜的腐蚀反应活化能. 相似文献
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3-氨基-1,2,4-三氮唑对铜的缓蚀性能和吸附行为 总被引:4,自引:0,他引:4
采用电化学和表面增强拉曼光谱(SERS)方法研究了新型环境友好型金属水处理剂3-氨基-1,2,4-三氮唑(ATA)对铜在3% NaCl溶液中的缓蚀性能和吸附行为. 结果表明, ATA对铜有较好的缓蚀作用, 其中ATA浓度为0.24 mmol·L-1时对铜的缓蚀效率最高, 为97.65%, 其吸附行为符合Langmuir吸附等温式, 吸附机理是典型的化学吸附援SERS表明, ATA分子通过很强的吸附于铜表面达到抑制其腐蚀的作用, 是ATA-与Cu+形成配合物来阻止氯离子化合物(CuCl-2)的生成. 相似文献
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Gemini型咪唑啉双季铵盐金属缓蚀剂的合成及其性能 总被引:7,自引:0,他引:7
合成了系列新型咪唑啉双季铵盐阳离子缓蚀剂(S-HSJ),研究并讨论了其在5%HCl介质中对铜、铁、铝等金属的缓蚀性能及缓蚀剂结构中亲油基部分碳链长度、缓蚀时间、缓蚀剂浓度等对缓蚀效果的影响. 研究表明,S-HSJ系列咪唑啉双季铵盐对红铜、黄铜、铝及马口铁四种金属均表现出较传统单季铵盐与苯并三氮唑缓蚀剂好的缓蚀性能,S-HSJ-16双季铵盐添加量0.1%时缓蚀效率可达94%~99%,S-HSJ与阴离子表面活性剂复配对铜腐蚀表现出明显协同效应. 相似文献
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采用失重法、密度泛函理论和分子动力学模拟研究了预腐蚀对L-蛋氨酸在60℃、1M的HCl溶液中对Q235碳钢的影响和缓蚀剂的缓蚀机理。结果表明:预腐蚀作用降低了L-蛋氨酸对Q235碳钢缓蚀作用,缓蚀率下降15%。密度泛函理论和分子动力学模拟结果表明,羧基上的氧原子带有明显的负电荷能够吸附到金属表面形成缓蚀剂膜,发挥缓蚀作用,为成膜缓蚀机理。L-蛋氨酸在没有预腐蚀的Q235碳钢表面吸附分子数为24时,缓蚀剂膜最致密。而L-蛋氨酸在预腐蚀后的Q235碳钢表面吸附时的吸附能显著降低,缓蚀剂在碳钢表面的分布密度也明显下降,这很好解释了预腐蚀作用降低了缓蚀剂缓蚀率的实验结果。本文的研究结果对缓蚀剂的研究和实际应用具有一定的指导意义。 相似文献
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咪唑离子液体对铜在硫酸溶液中的缓蚀作用 总被引:1,自引:0,他引:1
采用动电位极化和电化学阻抗谱技术研究了三种新型烷基咪唑离子液体, 1-丁基-3-甲基咪唑硫酸氢盐([BMIM]HSO4), 1-已基-3-甲基咪唑硫酸氢盐([HMIM]HSO4), 1-辛基-3-甲基咪唑硫酸氢盐([OMIM]HSO4), 对铜在0.5 mol·L-1 H2SO4溶液中的缓蚀作用. 实验结果表明: 咪唑离子液体能有效抑制铜在硫酸溶液中的腐蚀, 相同浓度下的缓蚀效率大小顺序为[OMIM]HSO4>[HMIM]HSO4>[BMIM]HSO4. 动电位极化表明三种咪唑化合物的加入对铜的阴阳极腐蚀过程均有抑制作用, 属于混合型缓蚀剂. 电化学阻抗谱用带两个常相位原件的等效电路对含两个时间常数的体系进行拟合, 发现咪唑化合物的添加会引起电荷传递电阻和双电层电容等阻抗参数的变化, 表明此类化合物通过吸附于铜电极与溶液界面起到缓蚀作用, 且这种吸附符合Langmuir吸附等温关系. 吸附过程热力学计算说明咪唑化合物在铜表面发生了自发的物理吸附. 相似文献
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K. F. Khaled Mohamed N. H. Hamed K. M. Abdel-Azim N. S. Abdelshafi 《Journal of Solid State Electrochemistry》2011,15(4):663-673
A new pyrimidine heterocyclic derivative, namely 2-ethylthio-4-(p-methoxyphenyl)-6-oxo-1,6-dihydropyrimidine-5-carbonitrile (EPD) was prepared and its inhibition performance towards copper
corrosion in 3.5% NaCl solutions was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS)
and electrochemical frequency modulation (EFM) measurements. Experimental investigations showed that EPD reduces markedly
the copper corrosion in 3.5% NaCl solutions. EFM can be used as a rapid and non destructive technique for corrosion rate measurements
without prior knowledge of Tafel constants. Monte Carlo simulation technique incorporating molecular mechanics and molecular
dynamics can be used to simulate the adsorption of pyrimidine derivative (EPD) on the Cu (111) surface in 3.5% NaCl. 相似文献
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N.A. Al-Mobarak K.F. Khaled Mohamed N.H. Hamed K.M. Abdel-Azim N.S. Abdelshafi 《Arabian Journal of Chemistry》2010,3(4):233-242
Electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization have been used to investigate the inhibition effect of a new pyrimidine heterocyclic derivative, namely 2-mercapto-4-(p-methoxyphenyl)-6-oxo-1,6-dihydropyrimidine-5-carbonitrile (MPD) on copper corrosion in 3.5% NaCl solutions at 25 ± 1 °C. The electrochemical investigations showed that MPD gives sufficient inhibition against copper corrosion in 3.5% NaCl solutions. Potentiodynamic polarization measurements have shown that the MPD inhibit both the cathodic and anodic processes and thus it classified as mixed-type inhibitor. EIS measurements indicate that the values of constant phase elements (CPEs) tend to decrease and both charge-transfer resistance and inhibition efficiency tend to increase by increasing the inhibitor concentration. Electrochemical kinetic parameters obtained using EFM methods were comparable with that calculated from traditional measurements (EIS and potentiodynamic polarization). Molecular simulation technique was used to investigate the adsorption configuration of MPD on copper surface. Number of electrons transferred from MPD to the copper surface was calculated by semi-empirical quantum chemical calculations. 相似文献
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Corrosion of copper in aerated synthetic sea water (3.5% NaCl) solutions and its inhibition by 3-amino-1,2,4-triazole (ATA) have been studied using electrochemical, gravimetric, and pH measurements, along with Raman spectroscopy. Electrochemical measurements indicated that the presence of ATA and the increase of its concentration suppress the corrosion process on the copper surface. This effect decreases cathodic, anodic, and corrosion (jcorr) currents and corrosion rates (Kcorr), while increasing polarization resistance (Rp), surface coverage (theta), and inhibition efficiency (IE%). Weight loss measurements indicated that the dissolution of copper and the accompanying change of pH decreased to a minimum even after 24 days immersion due to the presence of ATA and the increase of its concentration. Raman investigations revealed that the inhibition of copper corrosion is achieved by strong adsorption of ATA molecules onto the copper surface, preventing it from being corroded easily. 相似文献
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B. Hammouti A. Dafali R. Touzani M. Bouachrine 《Journal of Saudi Chemical Society》2012,16(4):413-418
The corrosion behaviour of copper in aerated 3% NaCl solution was investigated by rotating electrode at various rates. The reduction of O2 obeys the Levich equation. The inhibition of the copper corrosion in aerated 3% NaCl solution was studied by using potentiodynamic polarisation and linear polarisation resistance (LRP) in the presence of different concentrations of a bipyrazolic compound named N,N-bis (3-carbomethoxy-5-methylpyrazol-1-ylmethyl) cyclohexylamine (BiPyA). The presence of this compound in the solution decreases the corrosion current density and increases the linear resistance polarisation. The inhibition efficiencies obtained from cathodic Tafel plots and LRP methods are in good agreement. BiPyA compound presents an efficient inhibitor of copper corrosion, acts as a mixed-type inhibitor and adsorbs on the copper surface according to the Langmuir isotherm model. 相似文献
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Cu以其优异的导电性、导热性和易加工性广泛用于工农业生产中.自然Cu的腐蚀和防腐成为人们很关注的问题.人们已经注意到,Cl-对Cu的腐蚀有影响,并进行过一些研究.但目前使用光电化学方法研究这一问题的文章尚不多见,特别是利用测量开路光电压及其瞬态波形这一现场的、无损的、灵敏的监测方法研究户对Cu电极腐蚀全过程的文章尚未见到.本文正是利用如上方法及XPS,AES方法,研究了Cl-对Cu电极腐蚀的全过程,取得了一些有意义的结果.1实验方法Cu电极用99.99%(质量分数)的Cu制成,面积约为39mm2;电极底部由Cu导线焊接引出,… 相似文献
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Khalil Farhadi Sepideh Banisaeid Arezu Jamali Hamid Zebhi Zahed Ghelichkhah Hedayat Khalili Robab Abbasi 《中国化学会会志》2015,62(12):1149-1154
Electrochemical polymerization of tyramine was achieved on copper electrode surface from tyramine in 0.3 M oxalic acid (pH=1.2) solution by using cyclic voltammetry technique. The formation of polytyramine nanoparicles (PTN) were characterized by cyclic voltammetry (CV), fourier transform infrared‐attenuated total reflectance (FTIR‐ATR) spectroscopy and scanning electron microscopy (SEM). The corrosion behavior of PTN coated copper was investigated by means of the change of open circuit potential with exposure time (Eocp t), electrochemical impedance spectroscopy (EIS) and anodic polarization curves in 3.5 % NaCl solutions at room temperature. The obtained results showed the shift of corrosion potential toward positive values for electropolymerized copper and a significant decrease in corrosion current and corrosion rate in comparison with bare copper, so that the PTNs coating could be used as an important protection against corrosion of copper. 相似文献
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Effects of 3-amino-1,2,4-triazole on the inhibition of copper corrosion in acidic chloride solutions 总被引:1,自引:0,他引:1
Effects of 3-amino-1,2,4-triazole (ATA) on the inhibition of copper corrosion in 0.5 M HCl solutions have been studied using gravimetric, electrochemical, and Raman spectroscopy investigations. Weight-loss measurements after varied immersion periods revealed that the dissolution rate of copper decreased to a minimum, while the inhibition efficiency (zeta%) and consequently the degree of surface coverage (theta) increased with the presence of ATA and the increase of its concentration. Potentiodynamic polarization, chronoamperometric, and electrochemical impedance spectroscopy (EIS) measurements after 0, 24, and 48 h immersion of the copper electrode in the test solutions showed that the presence of ATA molecules significantly decreased cathodic, anodic, and corrosion (jcorr) currents and corrosion rates (Rcorr) and greatly increased polarization resistance (Rp), zeta%, and theta; this effect was increased on increasing the ATA content in the solution. Raman spectroscopy confirmed that ATA molecules strongly adsorbed onto the copper surface, blocking its active sites and preventing it from being corroded easily. 相似文献