新型杂环化合物在1 mol/L HCl中对Q235钢的缓蚀性能研究

通过失重、电化学测试以及量子化学计算方法研究了新型杂环恶二唑化合物5-［(1H - 1,2,4 - 三氮唑 – 1- 基)甲基］-1,3,4 噁二唑 - 2 - 硫醇(TAOT)在1 mol/L HC1中对Q235钢（碳钢）的缓蚀作用.结果表明,TAOT在1 mol/L HC1中对Q235钢的缓蚀作用高达89.1％,能同时抑制碳钢腐蚀的阴、阳极反应过程.碳钢的阻抗值随TAOT浓度增加而增大,其在碳钢表面的吸附符合Langmuir等温式,量子化学计算结果也表明,该化合物物可能是通过巯基提供电子与碳钢表面相互作用来起到缓蚀作用的.     

新型杂环化合物在0.5mol/LH_2SO_4中对Q235钢的缓蚀性能

通过失重试验、电化学测试以及量子化学计算方法研究了新型杂环噁二唑化合物1-苯基-2-{5-(1,2,4-三氮唑)-1甲基-(1,3,4-噁二唑)-2-硫}-乙酮(PTOE)在0.5 mol/L H2SO4中对Q235钢(碳钢)的缓蚀性能,并用扫描电镜方法观察了碳钢表面的腐蚀形貌.结果表明,PTOE在0.5 mol/L H2SO4中对Q235钢有高达92.7%的缓蚀作用,能同时抑制碳钢腐蚀的阴、阳极反应过程.碳钢的阻抗值随PTOE浓度增加而增大,其在碳钢表面的吸附符合Langmuir等温式.同时用量子化学中的从头算方法对缓蚀剂的分子结构与缓蚀性能的关系进行了研究.     

三唑化合物在1mol/L盐酸中对碳钢的缓蚀作用研究

合成了一种新型三氮唑化合物：1-（3-（4-氟苯基）-4,5-吡唑基-2-（1,2,4-三唑基）乙酮,并通过失重实验、动电位极化、交流阻抗及扫描电镜方法研究了其在1mol／L盐酸溶液中对Q235碳钢的缓蚀效果。结果表明,该三唑化合物在1mol／L盐酸中对Q235碳钢有较好的缓蚀效果,是混合型缓蚀剂,该缓蚀剂在碳钢表面的吸附符合Langmuir等温吸附式。     

酸性介质中氮杂环类缓蚀剂在碳钢上的吸附行为

合成了一种新型含氮杂环有机物:2-(4-叔丁基-苯甲基硫)-5-(1,2,4-三氮唑)-甲基-(1,3,4-噁二唑)(TBTO),通过交流阻抗、动电位极化、失重实验研究了其在酸性介质中的缓蚀效率,并用扫描电镜方法分析了碳钢表面的腐蚀形貌变化.结果表明:TBTO在0.5mol/L H2SO4中对Q235钢的缓蚀作用高达96.2%,能同时抑制碳钢腐蚀的阴、阳极反应过程;化合物在碳钢表面上的吸附行为服从Langmuir吸附等温式.同时用量子化学中的从头算方法对缓蚀剂的分子结构与缓蚀性能的关系进行了研究.     

新型恶二唑类缓蚀剂的合成及其缓蚀性能

合成了一种恶二唑类缓蚀剂 2,5-(2-十一烷基)-1,3,4恶二唑 (简称 HOX),对其进行了表征,并采用静态失重法、动电位极化和电化学阻抗谱 (EIS) 研究其在HCl介质中对 Q235 钢的缓蚀作用.研究表明,所合成的恶二唑类化合物是一种性能优异的混合控制型酸性碳钢缓蚀剂,其在碳钢表面的吸附符合Langmuir吸附模型.     

新型噁二唑类缓蚀剂的合成及其缓蚀性能

合成了一种恶二唑类缓蚀剂2,5-（2-十一烷基）-1,3,4恶二唑（简称HOX）,对其进行了表征,并采用静态失重法、动电位极化和电化学阻抗谱（EIS）研究其在HCl介质中对Q235钢的缓蚀作用。研究表明,所合成的恶二唑类化合物是一种性能优异的混合控制型酸性碳钢缓蚀剂,其在碳钢表面的吸附符合Langmuir吸附模型。     

新型双苯并咪唑基硼酸酯衍生物的合成及其缓蚀行为

以双甘油酸硼酸酯(DGB)为原料,使DGB分别与邻苯二胺和N-甲基邻苯二胺发生酰胺化-环化反应合成了2种新的缓蚀剂,即双(2-苯并咪唑基)乙二醇硼酸酯(2a)和双(1-N-甲基-2-苯并咪唑基)乙二醇硼酸酯(2b)。采用失重法、电化学法和扫描电子显微镜(SEM)研究了2种化合物在盐酸酸洗液中对Q235碳钢的缓蚀性能。结果表明：2种化合物在5%HCl酸洗液中对Q235碳钢具有良好的缓蚀效果,当这两种化合物加入量为100 mg/L、经过6 h腐蚀后,其最大缓蚀率均超过了98.1%,此外,两种缓蚀剂在碳钢表面的吸附规律符合Langmiur吸附等温式,吸附行为属于自发进行,亦属于化学吸附过程。     

生物基缓蚀剂糠醇缩水甘油醚的缓蚀性能及机理

在生物基呋喃类缓蚀剂的研究基础上,利用Tafel极化曲线和电化学阻抗技术(EIS)研究了Q235碳钢在不同浓度的糠醇缩水甘油醚(FGE)盐酸溶液中的腐蚀行为,并通过静态失重实验分析了Q235碳钢在不同体系中的腐蚀速率。结果表明,4.92×10~(-4)mol·L~(-1)的FGE对Q235碳钢具有最好的缓蚀效果,其缓蚀效率达到94.0%,腐蚀速率为0.076 mg·cm~(-2)·h~(-1)。此外,经证明FGE在Q235碳钢表面的吸附过程符合Langmuir吸附模型,同时发生物理吸附和化学吸附。     

酸性介质中新型三唑类缓蚀剂在碳钢上的吸附行为

合成了一种新型三唑衍生物:苯戊酮-O-1-(1.3.4-三氮唑)亚甲基肟(POTM),通过失重试验、交流阻抗、动电位极化研究了其在酸性介质中的缓蚀效率,并用扫描电镜方法观察了碳钢表面的腐蚀形貌。对热力学参数进行了讨论,表明化合物在碳钢表面上的吸附行为服从Langmuir吸附等温式。同时用量子化学中的从头算方法对缓蚀剂的分子结构与缓蚀性能的关系进行了研究。     

盐酸溶液中聚酰胺-胺树形分子-水杨醛席夫碱自组装膜对Q235碳钢的缓蚀作用及吸附机理

合成了1.0G聚酰胺-胺树状分子-水杨醛席夫碱(PAMAM(1.0G)-SA),以其在Q235碳钢表面制备自组装单分子膜(SAMs),用电化学方法研究SAMs在5%HCl介质中对Q235碳钢的缓蚀作用及其吸附行为,结果表明PAMAM(1.0G)-SA分子可以在Q235碳钢表面形成稳定的SAMs,改变了表面的双电层结构,抑制了碳钢表面的阳极氧化和阴极还原过程,碳钢电极的电荷转移电阻明显提高,双电层电容降低,电化学阻抗和极化曲线测试结果显示,碳钢表面PAMAM(1.0G)-SA的SAMs在5%HCl介质中具有良好的缓蚀作用,PAMAM(1.0G)-SA在碳钢表面的吸附行为符合Langmuir吸附等温式,属于化学吸附,利用量子化学方法对PAMAM(1.0G)-SA的SAMs形成机理进行了分析。     

Effects of different simulated fluids on anticorrosion biometallic materials

1　ＩＮＴＲＯＤＵＣＴＩＯＮＣｏｒｒｏｓｉｏｎｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｒｅａｓｏｎｓｆｏｒｔｈｅｆａｉｌｕｒｅｏｆｍｅｔａｌｌｉｃｂｉｏｍａｔｅｒｉａｌｓｉｍｐｌａｎｔｅｄｉｎｈｕｍａｎｂｏｄｙ .Ｒｅｓｅａｒｃｈｉｎｇｔｈｅｉｍｐｌａｎｔｅｄｍｅｔａｌｓ’ｃｏｒ ｒｏｓｉｏｎｓｈｏｕｌｄｃｏｎｓｉｄｅｒｍａｎｙｆａｃｔｏｒｓ ,ｓｕｃｈａｓｔｈｅｐｒｏｐｅｒｔｉｅｓｏｆｔｈｅｍａｔｅｒｉａｌｓ ,ｔｈｅｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅｂｏｄｙｆｌｕｉｄｓ ,ｔｈｅｃｈａｎｇｅｏｆｐ…     

2,5-Bis(4-dimethylaminophenyl)-1,3,4-oxadiazole and 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole as corrosion inhibitors for mild steel in acidic media

2,5-Bis(4-dimethylaminophenyl)-1,3,4-oxadiazole (DAPO) and 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole (DAPT) have been synthesised and their inhibiting action on the corrosion of mild steel in 1 M HCl and 0.5 M H₂SO₄ at 30 °C has been investigated by various corrosion monitoring techniques. At constant acid concentration, the inhibitor efficiency of both the compounds is found to increase with inhibitor concentration. DAPT is slightly more efficient in 0.5 M H₂SO₄ than in 1 M HCl whereas DAPO is more efficient in 1 M HCl. Of the two, DAPT appears to be a better inhibitor. Potentiostatic polarisation studies show that both are mixed-type inhibitors in 1 M HCl but cathodic-type in 0.5 M H₂SO₄. The inhibitors function through adsorption following Langmuir isotherm in both the acids. The electronic properties of DAPO and DAPT, obtained using the AM1 semi-empirical quantum chemical approach, have been correlated with their experimental inhibition efficiencies using the linear resistance model (LR). These inhibitors are considered as a non-cytotoxic substances.     

含氮有机缓蚀剂BIEA在浓盐酸中对铁和钢的缓蚀性能

合成了N、N、N、N′-四-(2-苯并咪唑甲基)-1,2-7二胺分子(以BIEA表示)作为吸附型高效含氮有机缓蚀剂(AHNOI)．在HC1溶液中失重法测得BIEA对纯铁的缓蚀率为91．2％(浓度为0．0071％),与癸胺复配时协同缓蚀率为98．7％．极化曲线结果表明：BIEA和BIEA与直链脂肪胺复配均能抑制纯铁的阴、阳极过程．     

缓蚀剂添加量对Q235螺纹钢耐蚀性能的影响

目的提高螺纹钢的耐蚀性能。方法采用模拟穿水淬火冷却工艺,在加入ZnSO_4缓蚀剂的介质中对Q235螺纹钢进行淬火热处理。通过XRD测试、大气腐蚀和电化学测试(包括极化曲线和交流阻抗)等手段对不同淬火介质中Q235螺纹钢进行表征和测试。结果淬火处理后试样表面生成Fe_2O_3、Fe_3O_4和Zn(OH)_2的保护膜,当ZnSO_4缓蚀剂添加量达到120 mg/L时,Q235螺纹钢的腐蚀速度由自来水淬火状态的0.4583 g/(d·m~2)降低到0.2083 g/(d·m~2),腐蚀速度降低了54.5%;Q235螺纹钢的腐蚀电位由-0.3752 V提高到-0.2997 V,增加了20.1%;腐蚀电流由5.2482×10~(-5)A降低到1.6082×10~(-5)A,降低了69.3%;容抗谱Rr由25.58Ω增加到32.52Ω,增加了27.1%。Q235螺纹钢在模拟雨水中的极化形式为电化学极化。结论 ZnSO_4缓释剂可有效提高Q235螺纹钢的耐蚀性能。     

SO2-4 ,PO3 4- 对曼尼希碱酸化缓蚀剂缓蚀性能的影响

目的：研究废酸液中介质离子对曼尼希碱酸化缓蚀剂缓蚀性能的影响,以解决碳钢在酸液中的腐蚀问题。方法采用静态失重法、极化曲线、扫描电镜及能谱分析法,研究SO2-4,PO3-4对曼尼希碱型酸化缓蚀剂缓蚀性能的影响,并探究其作用机理。结果在10%(质量分数)盐酸、0.1%(质量分数)曼尼希碱的缓蚀介质中,随SO2-4质量分数的增大,腐蚀电流密度由2.81μA/cm2增加至7.32μA/cm2,腐蚀速率显著增大,缓蚀效果变弱;随PO3-4质量分数的增加,腐蚀电流密度由2.81μA/cm2减小至2.41μA/cm2,腐蚀速率减小,缓蚀效果变强。结论 SO2-4会通过钢铁表面已经形成的吸附膜上的细孔和缺陷渗入膜内,使膜发生开裂,从而侵蚀和破坏已经形成的吸附膜,抑制缓蚀剂的缓蚀效果;PO3-4与腐蚀产物Fe3+络合并在钢材表面形成一层致密的保护层,使缓蚀剂形成的吸附膜更加致密,阻止腐蚀性介质与金属表面接触,同时增加对离子或溶解氧的扩散阻力,提高缓蚀剂的缓蚀效果。     

Electrochemical and theoretical investigation on the corrosion inhibition of mild steel by thiosalicylaldehyde derivatives in hydrochloric acid solution

Inhibitory effect of three Schiff bases 2-{[(2-sulfanylphenyl)imino]methyl}]phenol (A), 2-{[(2)-1-(4-methylphenyl)methylidene]amino}-1-benznethiol (B), and 2-[(2-sulfanylphen-yl)ethanimidoyl)]phenol (C) on corrosion of mild steel in 15% HCl solution has been studied using weight loss measurements, polarization and electrochemical impedance spectroscopy (EIS) methods. The results of the investigation show that the compounds A and B with mean efficiency of 99% at 200 mg/L additive concentration have fairly good inhibiting properties for mild steel corrosion in hydrochloric acid, and they are as mixed inhibitor. All measurements show that inhibition efficiencies increase with increase in inhibitor concentration. This reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel surface. Adsorption of these inhibitors follows the Langmuir adsorption isotherm. Thermodynamic adsorption parameters (K_ads, ΔG_ads) of studied Schiff bases were calculated using the Langmuir adsorption isotherm. Activation parameters of the corrosion process such as activation energies, E_a, activation enthalpies, ΔH^∗, and activation entropies, ΔS^∗, were calculated by the obtained corrosion currents at different temperatures. Obvious correlation was found between the corrosion inhibition efficiency and the calculated parameters. The obtained theoretical results have been adapted with the experimental data.     

含氮对机缓蚀剂BIEA在浓盐酸中对铁和钢的缓蚀性能

合成了Ｎ、Ｎ、Ｎ’、Ｎ’－四－（２－苯并咪唑甲基）－１,２－乙二胺分子（以ＢＩＥＡ表示）作为吸附型高效含氮有机缓蚀剂（ＡＨＮＯＩ）。在ＨＣｌ溶液中失重法测得ＢＩＥＡ对纯铁的缓蚀率为９１．２％（浓度为０．００７１％）,与癸胺复配时协同缓蚀率为９８．７％。极化曲线结果表明：ＢＩＥＡ和ＢＩＥＡ与直链脂肪胺复配均能抑制纯铁的阴、阳极过程。     

几种离子对硫化亚铁膜离子选择性的影响

使用除氧的FeCl2和Na2S溶液在纤维素膜上制备出了硫化亚铁膜,通过测量膜电位曲线的方法,研究了硫化亚铁膜的离子选择性和几种阴、阳离子以及咪唑啉缓蚀剂对膜的离子选择性的影响.结果表明,硫化亚铁膜是一种双极结构膜,靠近FeCl2溶液一侧为阳离子选择性,与Na2S溶液接触一侧为阴离子选择性.这种双极结构膜能够加速钢铁的阳极溶解进而导致严重的腐蚀.硫化亚铁膜吸附Ca2+、Mg2+、Ba2+等阳离子后,由双极膜变为阴离子选择性膜;而吸附MoO2-4、PO3-4以及咪唑啉缓蚀剂后则变为阳离子选择性膜,这种阳离子选择性膜对膜下金属有一定的保护作用.同时采用动电位扫描法测试了表面形成硫化亚铁膜的A3钢在含有不同离子的3%NaCl溶液中的极化曲线.  TQ0288     

Studies on the effect of a newly synthesized Schiff base compound from phenazone and vanillin on the corrosion of steel in 2 M HCl

The inhibiting action of a Schiff base 4-[(4-hydroxy-3-hydroxymethyl-benzylidene)-amino]-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one (phv), derived from 4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one (phz) and 4-hydroxy-3-methoxy-benzaldehyde (vn), towards the corrosion behavior of steel in 2 M HCl solution has been studied using weight loss, polarization and electrochemical impedance spectroscopy (EIS) techniques. Although vn and phz were found to retard the corrosion rate of steel, the compound synthesized from vn and phz was seen to retard the corrosion rate even more. At constant temperature, the corrosion rate decreases with increasing inhibitor concentration. However, at any inhibitor concentration the increase in temperature leads to an increase in the corrosion rate of steel. The activations energies, ΔE_a, as well as other thermodynamic parameters (, ) for the inhibitor process were calculated. The inhibitor efficiencies calculated from all the applied methods were in agreement and were found to be in the order: phv > phz > vn.     

The acid corrosion of Fe-P alloys

The effect of the P-content in iron (0.002-0.12% P) and the stirring rate on the corrosion rate of five Fe-P alloys in H₂SO₄ and HCl solutions (pH = 0) has been investigated. It was assumed that phosphine generated during corrosion process acts as a stimulator of the cathodic process (at low concentrations) or as an inhibitor of both partial electrode processes (at high concentrations). A mechanism of the corrosion of Fe-P alloys, including the transfer of phosphine from the surface into the bulk of the solution by stirring has been discussed.