苯并三氮唑及其衍生物在硫酸溶液中对铜的缓蚀作用

用表面增强拉曼光谱技术（SERS）对在0．5mol/LH2SO4溶液中苯并三氮唑BTAH及其衍生物4CBTAH（4羧基苯并三唑）对铜的缓蚀作用机理进行了研究,发现4CBTAH对铜的作用与BATH的作用机理相似,在较正电位下两者都是通过三唑环与铜形成配合物覆盖在铜表面,随着电位负移在铜电极表面吸附的聚合物膜逐渐转化为分子形式吸附,4CBTAH中的－COOH基团只是起到空间位阻的作用,没有参与电极表面的吸附。     

苯并三氮唑和5—羧基苯并三氮唑对铜缓蚀作用的光电化学比较

采用光电化学方法和交流阻方法对不同浓度的BTA（苯并三氮唑）和5CBTA（5－羧基苯并三氮唑）在硼砂缓冲溶液（pH9.2)中对铜电极的缓蚀性能作了比较研究,研究发现两者对铜的缓蚀作用机理不同,一定浓度的BTA能使电极表面Cu2O膜的结构改变,在电位正向扫描过程中铜电极光响应由p型转化为n型,并可依此判断缓蚀剂的缓蚀性能,n型光响应越大,缓蚀剂的缓蚀性能越好,而5CBTA能使电极表面的Cu2O膜增多,在电位负向扫描过程中阴极光电流密度明显增大,并可据此判断缓蚀剂的缓蚀性能,阴极光电流密度愈大,缓蚀效果越好,同时这两种缓蚀剂均可用φv和某一较负电位下的阴极光电流密度Jph的大小来判断缓蚀剂的缓蚀性能,φv的Jph越负,缓蚀性能越好,交流阻抗方法的结果和光电化学的结果相一致。     

苯并三氮唑及其甲基衍生物在去离子水中对铜的缓蚀作用

采用电化学和分光光度法研究了苯并三氮唑和甲基苯并三氮唑在去离子水中对紫铜的腐蚀电化学行为的影响和吸附规律。结果表明，当浓度大于5mg/L时，苯并三氮唑和甲基苯并三氮唑均具有较好缓蚀性能，且甲基苯并三氮唑的缓蚀性能优于苯并三氮唑。这两种缓蚀剂属于阳极型缓蚀剂，吸附过程为放热反应，属化学吸附，服从Langmuir吸附等温式。     

羧酸类铜缓蚀剂与苯并三氮唑在海水中协同效应的研究

用挂片失重法及电化学极化曲线的方法，研究了一种羧酸类缓蚀剂与苯并三氮唑在海水中的协同效应。并与BTA在海水中对紫铜的缓蚀性能加以比较，结果表明，该类缓蚀剂与BTA复配后显示了比BTA更好的缓蚀性能。该类缓蚀剂制备工艺简单，从而降低了在海水中铜缓蚀的成本。     

苯并三氮唑＋乌洛托品在碳钢盐酸酸洗中的缓蚀作用

化学清洗是一种常用的除垢方法，其中控制腐蚀是清洗过程中的关键环节．通常的缓蚀剂分为阳极型缓蚀剂、阴极型缓蚀剂和混合型缓蚀剂，乌洛托品和苯并三氮唑均属于混合塑缓蚀剂。乌洛托品能吸附在金属表面．改变金属表面的性质，从     

苯并三氮唑缓蚀剂在铜表面覆盖行为的研究

应用交流阻抗方法研究了高浓度氯离子条件下的铜表 面苯并三氮唑(BTA)覆盖层随溶液中BTA浓度的变化规律.BTA浓度在0 mol/L～4.20×10-3 mol/L之间时,BTA覆盖层不能完全覆盖铜表面,覆盖度随CaCl2溶液中BTA含量的增加而增加;BTA浓度大于4.20×10-3 mol/L即可在铜表面形成较为完整的覆盖层,其覆盖度在0.8～0.9之间.BTA浓度小于9.42×10-3mol/L时,BTA覆盖层的厚度随浓度的提高也会有所增加;大于9.42×10-3mol/L后,BTA在铜表面的覆盖度和覆盖层厚度都达到稳定值.      

盐酸介质中苯并三氮唑衍生物的缓蚀机理研究

利用微波促进合成了5种苯并三氮唑衍生物,利用失重法和电化学方法研究了其在50℃、5%盐酸中对N80钢的缓蚀效果,并利用电化学方法重点讨论了吗啉甲基苯三唑的缓蚀行为.结果表明,合成的5种衍生物对实验条件下的N80钢有较好的缓蚀效果,属于吸附型缓蚀剂;吗啉甲基苯三唑为混合控制型缓蚀剂,其对N80钢的缓蚀作用属于几何覆盖效应,符合Langmuir吸附等温式. 页     

碳酸氢钠溶液中苯并三氮唑对A3钢缓蚀作用的研究

以往对缓蚀剂在腐蚀产物膜上的缓蚀作用研究的较少,本文通过设计预腐蚀实验,研究了缓蚀剂在含膜表面的缓蚀作用。在实验中用静态挂片法研究了苯并三氮唑（BTA）对A3钢在碳酸氲钠溶液中缓蚀作用,并通过极化曲线探讨其缓蚀作用的机理,用扫描电镜（SEM）观察形成的表面膜形态,用XRD分析钢的表面腐蚀产物层的组成。实验表明苯并三氮唑在碳酸氢钠溶液中对A3钢有一定的缓蚀作用,可能是在A3钢表面形成一层Fe—BTA吸附膜,对阳极反应和阴极反应起一定阻滞作用,该膜吸附在金属表面阻滞侵蚀性离子吸附从而起到缓蚀效果。     

苯并三氮唑缓蚀铜合金的原位椭圆偏振研究

应用原位椭圆偏振光技术考察了苯并三氮唑(BTA)覆盖层对铜合金的缓蚀作用.对高浓度Cl-条件下的铜合金线性电位扫描的原位掠射椭圆偏振实验表明,椭圆偏振参量△的变化滞后于电流变化,说明BTA覆盖层阻碍了腐蚀产物向溶液中的转移.随着腐蚀产物的不断聚积,阳极过电位增加,减小了腐蚀反应的电位差,从而减缓了腐蚀反应的速度,增强了铜合金的耐腐蚀能力.     

3%NaCl溶液中铜的表面膜及BTA膜的光电化学研究

３％ＮａＣｌ溶液中铜的表面膜及ＢＴＡ膜的光电化学研究任聚杰，杨迈之，童汝亭，蔡生民（河北医学院石家庄０５００１７）（北京大学北京１００８７１）（河北师范大学石家庄０５００１６）１引言人们已经注意到Ｃｌ－对Ｃｕ有腐蚀作用［１，２］，关于ＢＴＡ对Ｃｕ的缓...     

Corrosion of copper in 3% NaCl solution polluted by sulphide ions

The effect of sulphide addition on the corrosion of copper in 3% NaCl was studied. The concentration of sulphide was kept rather low, up to 10 ppm. The effect of sulphide on the copper corrosion is controversial in the literature, and worth to verify by means of various experimental techniques. The polarisation curves, plotted from a potential close to the open circuit one to negative or to positive direction indicated a decrease of corrosion current density, whereas a quartz crystal microbalance indicated an acceleration of corrosion rate with increasing sulphide ion concentration. The reduction of corrosion product in boric-borate buffer solution allowed establishing that the thickness of corrosion product increased slightly when the sulphide concentration is higher. The EIS measurements showed a slight increase of corrosion rate by addition of sulphide ions, in agreement with EQCM experiments.     

天然海水中BTA与KI对黄铜的协同缓蚀作用

采用极化曲线、交流阻抗、溶液分析等方法研究了苯并三氮唑(BTA)与碘化钾(KI)对天然海水中黄铜的协同缓蚀作用及加药顺序对缓蚀性能的影响.结果表明,当BTA和KI的使用浓度分别为2 mg/L和10 mg/L时,对黄铜的缓蚀率达到97.19%;考虑加药顺序后缓蚀率可进一步提高到99.31%.极化曲线测试表明,BTA与KI复配为混合型缓蚀剂,且抑制阴极反应的程度更强.SEM照片显示,添加了BTA与KI缓蚀剂的铜片表面基本没有腐蚀.溶液分析显示添加了BTA与KI复配缓蚀剂后有效地抑制了黄铜的脱锌腐蚀.     

Substituted uracils as corrosion inhibitors for copper in 3% NaCl solution

Substituted uracils were tested as corrosion inhibitors of copper in 3% NaCl medium using electrochemical polarisation, impedance measurements and non-electrochemical techniques (weight loss, IR and UV-visible). This study permitted to follow the evolution of the inhibitory effect of the uracil derivatives, according to their substituents, on copper in 3% NaCl medium. Comparison of results showed that dithiouracil (DTUr) was the best inhibitor. The maximum inhibition efficiency reached 98% at 10⁻³ M. DTUr adsorbs on the copper surface according to the Frumkin isotherm model.     

Corrosion wear behavior of Al-bronzes in 3.5% NaCl solution

The corrosion wear behaviors of two aluminum bronzes, Cu-14Al-X and QAl9-4, in 3.5% NaCl solution were investigated on a pin-on-block reciprocating tester. It was found that the wear loss of the bronzes in 3.5% NaCl solution was lower than that in water and in air, i.e., it exhibited “negative” synergy between corrosion and wear. To understand the corrosion wear mechanism of the bronzes, the corrosion rate and polarization curves of Cu-14Al-X and QAl9-4 in 3.5% NaCl solution were determined. The worn surfaces of the specimens were examined, and the wear tracks were measured using scanning electron microscopy. The corrosion patinas formed on the specimen surfaces were studied with x-ray photoelectron spectroscopy and electron probe microanalysis. The corrosive solution was shown to play an important role in cooling of the specimen surfaces during the wear, thus preventing the specimen’s surface hardness from being reducing, induced by frictional heat during the sliding wear. On the other hand, the bronzes suffered from dealloying corrosion; a noble copper subsurface and patina formed on the specimen surface in the corrosive solution, which had a passive function for further corrosion. The noble copper subsurface experienced strain hardening during the corrosion wear, resulting in an increase of the surface hardness and thus an increase in wear resistance.     

Corrosion damage in frozen 3.5 wt.% NaCl solution

Zn and frozen 3.5 wt.% NaCl solution were used to simulate galvanized steel structures exposed to the seawater in the Polar Regions. The conductivity of the frozen salt solution and the corrosion of the Zn were characterized by electrochemical impedance spectroscopy, galvanic current measurement, and surface analyses. The results indicated that the completely frozen 3.5 wt.% NaCl solution was still conductive and corrosive, and the galvanic effect between different metals could not be ignored. The corrosion damage risk of metallic structures, particularly in the joint regions, can be high under freezing marine conditions in the Polar Regions.     

受BTA保护的白铜在模拟工业大气环境中的腐蚀行为

以涂盐沉积的方式进行室内加速实验,通过SEM/EDS、XRD和电化学测试等分析技术,研究受苯并三氮唑(BTA)保护的白铜在模拟工业大气环境中的腐蚀行为。结果表明,腐蚀初期受BTA保护的白铜表面存在棱状的盐结晶,说明腐蚀介质无法完全渗入基体。随着腐蚀时间延长,其对应的腐蚀电流密度呈现先减小后增大的趋势,其原因在于表面除了BTA化学转化膜还存在因腐蚀而产生的氧化膜,2者的共同作用延缓了腐蚀的进行,而当局部的BTA膜层因不断消耗出现破损,腐蚀区域则会从此处开始扩展,腐蚀电流密度也会随之增加。对比BTA处理前后的白铜,虽然最终的腐蚀产物主要成分均为ZnSO₄·6H₂O和Cu₄(SO₄)(OH)₆,呈现为疏松多孔状,但从截面形貌和动力学曲线分析,受BTA处理后的白铜腐蚀程度更轻微。     

Cu-Cr合金在3.5％NaCl+H2SO4溶液中脱铬腐蚀行为

通过金相、扫描电镜(SEM／EXD)，结合X射线衍射(XRD)研究了Cu-Cr合金在3.5％NaCl+H2SO4溶液中脱铬腐蚀行为。结果表明，Cu-Cr合金脱铬腐蚀首先发生在Cr相的界面处，并向Cr相内继续扩展，随H2SO4浓度增大及温度升高，其脱铬腐蚀倾向加大。     

Corrosion behavior of aluminum alloy 2024-T3 by 8-hydroxy-quinoline and its derivative in 3.5% chloride solution

The corrosion behavior of aluminum alloy 2024-T3 was studied in 3.5% NaCl solutinn with two fluorescence quinoline compounds named 8-hydroxy-quinoline（8HQ） and 8-hydroxy-quinoline-5-sulfonic acid（HQS）. The open circuit potential（OCP） test result indicates that both compounds change the alloy corrosion potential by adsorbing on the electrode surface. Polarization measurements show that 8HQ is a mixed type inhibitor by blocking the active sites of the metal surface, while HQS is a corrosion accelerator by activating the cathodic reaction. Changes of the impedance parameters in the electrochemical impedance spectroscopy（EIS） are related to the adsorption of 8HQ on the metal surface, which leads to the formation of a protective layer. The impedance diagram in the solution with HQS is similar to the one without additional organic compounds. The morphology and composition of the protective layer were studied by using SEM/EDS. The result confirms the function of the additions that the effect of 8HQ is due to the insoluble aluminum chelate, AI（HQ）3, to prevent adsorption of chloride ion, while the effect of HQS is to break down the oxide film.