钼酸盐及钨酸盐缓蚀剂在自来水中对A3钢的缓蚀能力比较

江苏科技大学材料科学与工程学院采用失重法与电化学极化法，研究了钼酸盐及钨酸盐缓蚀剂在自来水中对A3钢的缓蚀能力及使用条件，并分析了钼酸盐及钨酸盐的缓蚀机理。结果表明：钼酸盐和钨酸盐均适宜在较高温度下使用而且必须达到一定的使用浓度。     

中性水介质中环境友好缓蚀剂的研究

采用失重法与电化学极化法,研究了钼酸盐及钨酸盐缓蚀剂在自来水中对A3钢的缓蚀能力及使用条件,并分析了钼酸盐及钨酸盐的缓蚀机理。结果表明:钼酸盐和钨酸盐均适宜在较高温度下使用而且必须达到一定的使用浓度。     

钨酸盐作海水缓蚀剂可行性讨论

主要简述了钨酸盐作为低毒、无公害的无机缓蚀剂在金属防腐蚀方面的应用.首先从化学及电化学、点腐蚀、表面分析等方面介绍单一钨酸盐的缓蚀机理,它属于钝化膜、阳极型的缓蚀剂,当其浓度很低时起加速腐蚀的作用,属于"危险型缓蚀剂",因此,单一钨酸盐作为水处理剂时使用浓度很高;其次讨论了钨酸盐与其它缓蚀剂复配时,钨酸盐的使用量得以降低,而且缓蚀率也大大地提高;最后总结了钨酸盐缓蚀剂在各种水质中的缓蚀机理,提出了钨系缓蚀剂应用于海水中有一定的可行性,但其缓蚀机理需进一步讨论研究.     

电化学交流阻抗法研究钨酸盐与BTA的协同缓蚀作用

通过电化学阻抗谱技术和表面分析方法研究了钨酸盐和苯并三氮唑对碳钢的协同缓蚀作用。结果发现 :在 pH =9.0 ,氯离子浓度为 5× 10 -3mol/L的水中 ,钨酸盐和BTA单独用作缓蚀剂对碳钢均有一定的缓蚀作用 ,钨酸盐和BTA具有协同缓蚀作用。提高溶液 pH、降低氯离子浓度有助于增强钨酸盐 BTA复配缓蚀作用。复配缓蚀剂的缓蚀机理为WO2 -4 与BTA分别与Fe3+ 和Fe2 + 发生反应生成稳定的膜覆盖于电极表面     

除氧中性水中钨酸盐对碳钢的缓蚀机理研究华东理工大学防腐蚀中心

运用旋转圆盘电极测定碳钢的阳极极化曲线，研究了在含Cl-的中性腐蚀介质中钨酸盐对碳钢的缓蚀机理．结果表明钨酸钠对碳钢的缓蚀作用为钝化机理，但介质中Mg2+离子的存在对该钝化作用有显著影响．     

除氧中性水中酸盐对碳钢的缓蚀机理研究

运用旋转圆盘电极测定碳钢的阳极极化曲线，研究了在含Ｃｌ＾－的中性腐蚀介质中钨酸盐对碳钢的缓蚀机理，结果表明多情酸钠对碳钢的缓蚀作用为钝化机理，但介质中Ｍｇ＾２＋离子的存在对该钝化作用有显著影响。     

除氧中性水中钨酸盐对碳钢的缓蚀机理研究

运用旋转圆盘电极测定碳钢的阳极极化曲线,研究了在含Ｃｌ－的中性腐蚀介质中钨酸盐对碳钢的缓蚀机理．结果表明钨酸钠对碳钢的缓蚀作用为钝化机理,但介质中Ｍｇ２＋离子的存在对该钝化作用有显著影响．     

新型铜缓蚀剂的缓蚀性能及机理探讨

通过挂片试验，电化学研究及表面分析，研究了W及 其与BTA的复合配方WB在内冷水中对发电机空芯铜导线的缓蚀作用，并与BTA的缓蚀性能进行 了对比.研究结果表明，W对铜具有较好的缓蚀作用，与BTA复配后，其缓蚀作用比W及BTA单 独使用时都强，是一种主要阻滞阳极过程的混合型缓蚀剂.     

一种新型铜缓蚀剂的缓蚀性能及机理研究

通过挂片试验，电化学研究及表面分析，研究了ET及其与BTA的复合配方ETB在内冷水中对发电机空芯铜导线的缓蚀作用。并与BTA的缓蚀性能进行了对比。研究结果表明，ET对铜具有较好的缓蚀作用，与BTA复配后，在铜表面形成致密 事物膜，其缓蚀作用比ET及BTA单独使用时都强，是一种主要阻滞阳极过程的混合型缓蚀剂。     

异喹啉季铵盐缓蚀剂FIQ-C在盐酸中长效缓蚀机理的探讨

通过红外光谱、俄歇电子能谱及色－质联仪对吸附膜的检测分析，探讨了FIQ－C在10％盐酸中的长效缓蚀机理，解释了长效缓蚀原因，证明了在盐酸溶液中异喹啉季铵盐缓蚀剂FIQ－C降解的含氮有机物小分子是吸附成膜的主要成分，且不随时间而变化。     

钨酸钠及其复配缓蚀剂在模拟海水中对碳钢的缓蚀性能

目的考察在模拟海水中,钨酸钠及其与月桂酰肌氨酸钠复配物对Q235钢的缓蚀性能。方法进行挂片失重法实验,研究缓蚀剂添加量对缓蚀效率的影响;测定电化学极化曲线及阻抗谱,对比单一钨酸钠缓蚀剂与复配缓蚀剂的缓蚀效率以及相关拟合数据。结果钨酸钠单独使用时的缓蚀效果良好,缓蚀效率随着添加量的增加而增大,且在碳钢表面的吸附符合修正了的Langmuir吸附模型;与月桂酰肌氨酸钠复配后,缓蚀效率更高,阴极、阳极的塔菲尔斜率均减小,腐蚀电流密度也降低了很多。结论钨酸钠与月桂酰肌氨酸钠复配后比单独使用效果更好,二者有较好的协同缓蚀增效作用;复配缓蚀剂为混合型缓蚀剂。     

钨酸盐与聚天冬氨酸对碳钢协同缓蚀作用的研究

通过失重法研究了钨酸钠与聚天冬氨酸（PASP）对碳钢的协同缓蚀效应,实验发现,钨酸钠与PASP对自来水中的碳钢有协同缓蚀作用,加入锌离子可将复配缓蚀剂的缓蚀率提高到97．68％。碳钢的极化曲线研究发现钨酸钠－PASP和钨酸钠－PASP－Zn^2 复配缓蚀剂均以抑制阳极反应为主,碳钢表面的荧光分析表明,介质中投加锌离子会使PASP在碳钢表面的吸附量减少,碳钢表面膜的红外光谱表明,聚天冬氨酸中的羧基电离后,与碳钢表面的金属离子生成离子键。     

Zum Verhalten von Natriumsilikat als Korrosionsinhibitor für Aluminium in alkalischen Lösungen

The behaviour of sodium silicate as a corrosion inhibitor for aluminium in alkaline solutions Even at a temperature of 80°C and even in the presence of intensive mechanical stresses on the metal by a sharp spray jet (with a spraying pressure of 30 atmospheres excess pressure at the nozzle), sodium silicate (Na₂O:SiO₂ = 1 : 2,5) is able to prevent corrosion of pure aluminium (99,5 pC) by alkaline solutions (pH 11). For this purpose, very small quantities of adsorbed silicate per unit of area are already sufficient. It is essential, however, that the SiO₂ concentration in the solution does not sink below a certain minimum value, depending on ambient conditions, so that a sufficient quantity of silicate can be adsorbed. With increasing temperatures and spraying pressures, the silicate concentration must be higher if effective corrosion protection is to be attained. The corrosion-preventing film on the metal surface is formed by non-aggregated silicate. Different metals draw different quantities of corrosion inhibitor from the silicate solutions. This behaviour is presumably governed not only by the specific adsorption capacity for silicate ions but also by the corrosion resistance of the different metals in the solution.     

Contradictory effect of chromate inhibitor on corrosive wear of aluminium alloy

The corrosive wear of D16T aluminium alloy in artificial acid rain was studied. A special tribometer with the linear reciprocating ball-on-flat geometry was used. The setup allows to measure simultaneously an open circuit potential, to carry out potentiostatic and potentiodynamic polarization studies of the alloy corrosion and to record the friction coefficient. It was established that the addition of strontium chromate inhibitor to the working environment decreases an electrochemical corrosion of the aluminium alloy under wear conditions, but in general accelerates its destruction due to insufficient wear resistance of a formed surface film.     

The aluminium ion as a corrosion inhibitor for iron in water

The aluminium ion was found to be an effective inhibitor for iron corrosion in water in the pH range 4.1–4.5. The effect was ascribed to the formation of a thin hydrous aluminium oxide film on the iron surface which insulates the iron from the solution. This inhibitor is characterized by high inhibitive power even under stagnant conditions as well as flowing ones.     

The aluminium ion as a corrosion inhibitor for iron in water

The aluminium ion was found to be an effective inhibitor for iron corrosion in water in the pH range 4.1–4.5. The effect was ascribed to the formation of a thin hydrous aluminium oxide film on the iron surface which insulates the iron from the solution. This inhibitor is characterized by high inhibitive power even under stagnant conditions as well as flowing ones.     

Formation of corrosion resistant plasma electrolytic oxidation coatings on aluminium alloy with addition of sodium tungstate species

Plasma electrolytic oxidation (PEO) coatings were formed in silicate based electrolytes without and with the addition of sodium tungstate on AA?6063 aluminium alloy. Microstructure, composition and corrosion resistance of PEO coatings were investigated by scanning electron microscopy, X-ray diffraction and electrochemical impedance spectroscopy and potentiodynamic polarisation test respectively. The effects of additive sodium tungstate were examined. The results showed that the additive containing PEO coatings were of dense structure with additional phase (WO₃) and of less cracks than the additive free PEO coating. In addition, additive containing coatings were of better corrosion resistance than the additive free PEO coating, which was confirmed by electrochemical impedance spectroscopy and potentiodynamic polarisation tests. Furthermore, long time immersion test revealed that the PEO coated alloy with the addition of 12?g?L^??1 sodium tungstate maintained high impedance over 82?h in 3.5?wt-%NaCl, while the PEO coating without additive was unable to protect the substrate after such long time immersion.     

Influence of surface pretreatment on the anodizing film of Mg alloy and the mechanism of the ultrasound during the pretreatment

The effect of surface pretreatments on the micro-morphology, composition and the corrosion resistance of the anodic films formed on AZ91D magnesium alloys was investigated. The results showed that the aluminium content increased layer can be formed on the surface of the AZ91D magnesium alloys by the immersion pretreatment in aluminium nitrate solution with or without ultrasound. The pretreated surface with ultrasound was more uniform except for some pits. The anodic oxidation films on the pretreated magnesium alloys with ultrasound contained more aluminium and the pretreatment improved the uniformity of the anodic films. The use of ultrasound in the pretreatment process could significantly decrease the quantity and size of the micro-pores on the anodic films. The corrosion resistance of the anodic films formed on the pretreated magnesium alloys was improved. The corrosion resistance with ultrasound was better than that without ultrasound in the pretreatment process. In this paper, the effect and mechanism of the ultrasound during the immersion pretreatment process in aluminium nitrate solution was also discussed.