十六烷基二甲基乙基溴化铵在硫酸介质中对Q235钢的缓蚀性能研究

采用静态失重法,动电位极化曲线法和电化学阻抗法研究了十六烷基二甲基乙基溴化铵 (CDAB) 在硫酸介质中对Q235钢的缓蚀行为,并探讨了其对Q235钢的缓蚀作用机理.结果表明,在25 ℃下,缓蚀率随CDAB浓度增大而增大,在浓度仅为10 mgL^-1时,失重缓蚀率达85%左右.极化曲线实验结果显示,CDAB是一种以控制阳极反应为主的混合型缓蚀剂,且静态失重法,动电位极化曲线法和电化学阻抗法实验结果相一致.CDAB在Q235钢表面的吸附服从Kastening-Holleck吸附等温模型;CDAB的添加显著增大了腐蚀反应的活化能,有效抑制了腐蚀反应的进行.     

TC4钛合金在溴化锂水溶液中的空蚀行为

利用超声波气蚀试验机研究了TC4钛合金在温度为25℃蒸馏水和38%溴化锂水溶液中的空蚀行为。利用扫描电镜跟踪观察了空蚀形貌,测量了空蚀条件下的累积失重以及表面粗糙度的变化,对比了其在溴化锂溶液中静态和空蚀条件下的动电位极化曲线。结果表明,在空蚀相同时间条件下,TC4在溴化锂溶液中的累积失重量相比蒸馏水中有所升高。与静态相比,空化使TC4的自腐蚀电位正移近230mV,电化学腐蚀速率增加一个数量级。两种介质中的空蚀形貌相似,都是由初期出现裂纹和蚀坑发展到后期的蜂巢状结构。在溴化锂水溶液空蚀过程中,力学因素是造成腐蚀磨损失重的主要因素,但在交互作用中腐蚀对空蚀的促进作用更为明显。     

Corrosion Inhibition of Stainless Steel in HCl Solution Using Newly Aniline and o-Anthranilic Acid Copolymer

Protection of Metals and Physical Chemistry of Surfaces - This paper introduces copolymers of aniline and o-anthranilic acid with different ratio of aniline/o-anthranilic acid (r = 1, 2 and 3) as...     

Corrosion Inhibition of Steel in Lithium Bromide Brines

The inhibiting effect of phosphomolybdenic acid (PMA) on the corrosion of steel (St3) in 65% lithium bromide solution has been studied in a temperature range from 80 to 230°C and at pH 5.0–8.5. Corrosion and electrochemical studies showed that the efficiency of PMA as a corrosion inhibitor increases with an increase in temperature and pH of the LiBr brine. The ambiguous behavior of PMA in solutions at low temperatures and pH was analyzed. A blend of PMA with a low-temperature inhibitor (IFK) was suggested. It was shown that these inhibitors manifest synergism and the composition has high inhibiting properties at elevated temperatures. The effect of PMA on the effective activation energy of the corrosion process was analyzed.     

Cr-Co-Cu合金在模拟酸雨溶液中浸态腐蚀特征

研究了一种含Cr-Co元素的高强高导耐磨蚀Cu合金新材料,并对其进行了固溶时效热处理,考察了在pH 4.5模拟酸雨溶液中均匀浸态腐蚀特征,通过SEM对显微组织观察、表面腐蚀形貌扫描、EDS及XRD对腐蚀产物的分析.结果表明,铸造态Cr-Co-Cu合金具有很强的耐酸雨腐蚀性能,且经固溶时效热处理后的合金耐酸雨腐蚀性能有很大提高,其组织均匀,弥散分布的点状和骨骼状析出相钉扎腐蚀产物与基体结合紧密,阻止了材料的深入腐蚀,降低了腐蚀产物Cu2O增量.     

钛及钛钯合金在草酸溶液中的腐蚀行为

采用电化学测试和腐蚀浸泡法,并结合扫描电镜(SEM)和X射线衍射(XRD)等分析手段,研究了纯钛及钛钯合金(Ti-0.2Pa)在草酸溶液中的腐蚀行为.结果表明,钛及钛钯合金在草酸溶液中的腐蚀产物为TiH1.5.在试验条件下,钛钯合金的耐蚀性能虽略优于钛,但若延长试验时间,提高草酸溶液的温度或浓度,均会使钛钯合金腐蚀加重...     

盐酸溶液中烷基咪唑啉对铜的缓蚀行为

采用了电化学阻抗、极化曲线和循环伏安等方法研究了2-十一烷基-N-羧甲基-N-羟乙基咪唑啉(UHCI)在5%HCl溶液中对铜的缓蚀行为。结果表明,UHCI对铜有明显的缓蚀作用,随着缓蚀剂浓度的增加,其缓蚀率增大,但当缓蚀剂质量浓度达到0.15%后,再增加缓蚀剂浓度,缓蚀效率不再提高;该缓蚀剂是一种混合型缓蚀剂,同时抑制了阴极还原和阳极氧化过程。量子化学计算结果表明,缓蚀剂分子主要通过O(14)提供电子与金属原子成键,在金属表面发生化学吸附。     

Shot Noise Analysis to Investigate the Corrosion Inhibition of AZ91D Magnesium Alloy in Sulfuric Acid Solution

The corrosion inhibition of AZ91D magnesium alloy in 0.01 M H₂SO₄ by a Schiff base compound was investigated using Potentiodynamic polarization, Electrochemical Impedance Spectroscopy and Electrochemical Noise methods. It is found that the Schiff base acts as mixed-type inhibitor and the inhibition efficiency increases with concentration. Electrochemical impedance spectroscopy results showed that the Schiff base acts by adsorption at the metal/solution interface. Shot noise analysis showed that the inhibitor addition decreases the number of charge transfer events instead of the value of charge transfer at each electrochemical corrosion event. The corrosion inhibition effect was approved by suitable surface analysis.     

LaFe11.6Si1.4合金在水溶液中的缓蚀

利用电化学技术以及表面形貌分析对LaFe11.6Si1.4合金在水溶液中的缓蚀进行研究。结果显示,不同浓度的Na2WO4以及低浓度的NaH2PO4溶液对合金均有显著的缓蚀作用。这主要是由于加入缓蚀剂后,材料的阳极溶解反应被有效抑制,并且在低浓度下由于缓慢的扩散过程阻碍了反应的进行,从而最终抑制腐蚀的发生。     

铬酸钠对铀钛合金在氯化钠溶液中的缓蚀作用

采用失重法和电化学方法研究了铬酸钠对铀钛合金在200 mg/L氯化钠溶液中的缓蚀作用,并用X射线光电子能谱(XPS)和激光共聚焦显微镜分析铀钛合金表面氧化物成分和形貌。结果表明,铬酸钠属于阳极型钝化剂,缓蚀效率随浓度的增加而增大。但溶液温度对铬酸钠的缓蚀效率影响较大,溶液温度高于45℃时,加入100 mg/L的铬酸钠对铀钛合金具有加速腐蚀作用。XPS分析表明,铀钛合金表面形成的钝化膜中铀的氧化物存在两种形式,最外层为UO2+x,内层为UO2;加入铬酸钠后,钝化膜最外层含有UO2+x和多种铬化合物,厚度小于3 nm。     

氢氟酸溶液中苯扎溴铵对锌的缓蚀作用及吸附热力学研究

采用失重法研究了在不同温度下,不同浓度的苯扎溴铵在3%的氢氟酸溶液中对锌的缓蚀作用,实验结果表明：在3%的氢氟酸溶液中,苯扎溴铵对锌的腐蚀具有良好的抑制作用。苯扎溴铵浓度低时,随浓度增大,缓蚀作用加强;当其浓度达到一定值后,缓蚀作用基本保持不变。根据结构理论分析,苯扎溴铵在锌表面的吸附是产生缓蚀作用的重要原因,吸附规律服从Langmuir等温式。采用Sekine方法处理实验数据,获得了一系列相关热力学参数。     

核桃叶提取物在盐酸介质中对钢的缓蚀性能

核桃（Juglans）叶提取物（JLE）可以作为“绿色”环保的植物缓蚀剂。本工作采用失重法和动电位极化曲线研究了JLE在1mol／LHCI溶液中对冷轧钢的缓蚀作用。结果表明,JLE对冷轧钢具有较好的缓蚀作用,且存钢表面的吸附符合校正的Langmuir吸附等温式,极化曲线表明,JLE为混合抑制型缓蚀剂。     

硫酸中核桃叶提取物对钢的缓蚀性能

核桃叶提取物是一种"绿色"缓蚀剂.本文采用失重法、动电位极化曲线研究了核桃叶提取物在0.5mol/LH2SO4溶液中对冷轧钢的缓蚀作用.结果表明:核桃叶提取物对冷轧钢具有较好的缓蚀作用,在冷轧钢表面的吸附符合校正的Langmuir吸附等温式,极化曲线表明,核桃叶提取物为混合型缓蚀剂.     

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。     

硝酸铈对镁合金在硝酸铵溶液中的缓蚀作用

采用失重法、Tafel极化曲线和电化学阻抗谱法研究了在1 mol/L硝酸铵溶液中,稀土盐硝酸铈对镁合金的缓蚀作用。试验结果表明:在硝酸铵溶液中,硝酸铈能较好地减缓镁合金的腐蚀;硝酸铈对镁合金的缓蚀作用随其添加浓度的增加先增大,以后略有减小,硝酸铈浓度为1×10-3mol/L时,缓蚀率达到最大。     

乌洛托品作为酸洗缓蚀剂的探讨

采用挂片失重法研究了乌洛托品在不同浓度和温度下在盐酸清洗剂中对碳钢的缓蚀行为.结果表明:随着缓蚀剂乌洛托品浓度的增大,其浓度为1.5%时,缓蚀效率出现最大值,大于该浓度后,缓蚀效率下降;随着温度升高,乌洛托品的缓蚀作用效果降低.试验结果与工程实践结果相符.     

Corrosion Inhibition Efficiency and Adsorption Behavior of the Branched Cationic Tetrameric Surfactant for Carbon Steel in HCl Medium

Protection of Metals and Physical Chemistry of Surfaces - The branched cationic tetrameric surfactant (4C14tetraQ) that the length of four hydrocarbon chains is 14 was synthesized, and the...     

The Effect of TiB2 on Electrochemical Performance of Udimet 700 Alloy in 1 M Hydrochloric Acid Solution and Its Corrosion Inhibition Using Some Organic Derivatives

Protection of Metals and Physical Chemistry of Surfaces - The effect of adding 5 and 10% of TiB2 on the corrosion of Udimet 700 (U700) in 1 M HCl including altered concentrations of organic...     

Inhibition Effect of Rhodanine for Corrosion of Mild Steel in Hydrochloric Acid Solution

The inhibition effect of Rhodanine on the corrosion performance of mild steel (MS) was studied in 0.5 M HCl solution. For this purpose, potentiodynamic polarization, electrochemical impedance spectroscopy, and long-term corrosion tests including hydrogen evolution and change in open-cirquit potential during immersion time were used. To determine activation energy of corrosion process, potentiodynamic polarization curves were also obtained in a temperature range from 298 to 328 K. The results show that Rhodanine effectively inhibits the MS corrosion in hydrochloric acid solution. __________ From Zashchita Metallov, Vol. 41, No. 6, 2005, pp. 628–632. Original English Text Copyright ? 2005 by Solmaz, Kardas, Yazici, Erbil. The text was submitted by authors in English.     

Inhibition by some Thiocompounds of the Corrosion of Copper in Monochloracetic Acid Solution

Abstract

The inhibitory action of ethanolthiol, 2-mercaptoethanol and dodecyl mercaptan towards the corrosion of copper (99·8 %) in 0·1 M monochloracetic acid has been investigated. The inhibitive efficiency of these compounds may be arranged in the following order: dodecyl mercaptan > 2-mercaptoethanol > ethanolthiol. Polarisation measurements indicated that the compounds were principally cathodic corrosion inhibitors. I.R. spectra of the protective film formed on copper in solution inhibited with 2-mercaptoethanol, and of the pure chelate synthesised from 2-mercaptoethanol and copper ions in solution, were found to be identical.