共查询到18条相似文献,搜索用时 209 毫秒
1.
采用稳态极化曲线技术和交流阻抗测试技术研究了环己基二炔氧甲基胺氨基三甲撑膦酸盐在硫酸介质中的缓蚀作用机理.研究结果表明,环己基二炔氧甲基胺氨基三甲撑膦酸盐在硫酸介质中腐蚀电位负移,其缓蚀机理为混合抑制负催化效应,缓蚀剂分子可能参与了阴极反应过程.吸附等温式符合Frumkin等温式.该缓蚀剂存在浓度极值现象. 相似文献
2.
采用稳态极化曲线技术和交流阻抗测试技术研究了环己基二炔氧甲基胺氨基三甲撑膦酸盐在硫酸介质中的缓蚀作用机理。研究结果表明,环己基二炔氧甲基胺氨基三甲撑膦酸盐在硫酸介质中腐蚀电位负移,其缓蚀机理为混合抑制催化效应,缓蚀剂分子可能参与阴极反应过程。 相似文献
3.
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 相似文献
4.
5.
某些含氮化合物缓蚀作用的量子化学研究 总被引:11,自引:3,他引:8
用量子化学方法计算了苯胺及其卤代和甲基取代衍生物,N-苯基十二烷基胺及其甲基取代物等含氮化合物的电子结构,行讨论了在酸性介质中对软钢的缓蚀效果与其电子结构的关系。较好地解释了相同取代基不同取代位置以及同一取代位置不同取代基化合物的缓蚀率差异。从电子转移的角度说明了含氮有机化合物的缓蚀机理。为研制效果更好的有机缓蚀剂提供了有用的信息。 相似文献
6.
7.
高效气-液双相CO2缓蚀剂的研究 总被引:1,自引:1,他引:1
以吗啉、三聚甲醛、二正丁胺为原料合成了一种吗啉
衍生物,以异丁醛、氨水和硫为原料合成了一种噻唑衍生物.采用静态挂片失重法,研究了两种衍生物及其与其它缓蚀剂复配后对CO2腐蚀的缓蚀效果.结果表明,该吗啉衍生物与咪唑啉衍生物、硫脲及丙炔醇复配后对CO2腐蚀有很好的缓蚀效果;而噻唑衍生物单独使用时对CO2腐蚀有较好的缓蚀效果,其它常用缓蚀剂中只有丙炔醇对其有协同促进作用.这两种复配缓蚀剂都是高效气-液双相缓蚀剂. 相似文献
8.
嘧啶类缓蚀剂对酸性介质中奥氏体不锈钢的缓蚀量化构效影响研究 总被引:1,自引:1,他引:0
目的使用基于密度泛函(DFT)的量子化学法,研究嘧啶类缓蚀剂的分子结构和在酸性介质中对碳钢的缓蚀效率之间的关系。方法通过计算前线轨道能量(最高占据轨道和最低空轨道)、电荷分布、绝对电负性(χ)、偶极矩(μ)和转移电子数(ΔN)等量化参数,确定与缓蚀效率之间的关系。结果DHPMs缓蚀剂的缓蚀效率随着EHOMO值的增大而提高,随着ELUMO值的减小而提高,随着前线轨道能级差值(ELUMO-EHOMO)的减小而提高,随着转移电子数ΔN增大而提高。含有N原子的区域最有可能失电子并吸附在金属铁表面活性位置。结论由于DHPMⅠ的嘧啶环供电子能力较强,致使DHPMⅠ比DHPMⅡ的缓蚀效率高。 相似文献
9.
10.
《腐蚀科学与防护技术》2000,12(5)
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. 相似文献
11.
12.
Comparative study of bis-piperidiniummethyl-urea and mono-piperidiniummethyl-urea as volatile corrosion inhibitors for mild steel 总被引:1,自引:0,他引:1
Bis-piperidiniummethyl-urea (BPMU) and mono-piperidiniummethyl-urea (MPMU) were developed as novel volatile corrosion inhibitors (VCIs). Their vapor corrosion inhibition property was evaluated by volatile inhibiting sieve test (VIS) and vapor inhibiting ability test (VIA). Volatile weight-loss test in a closed space was used to compare their volatility. Electrochemical impedance spectroscopy of a volatile corrosion inhibitor monitor (VCIM) was applied to study the effect of BPMU and MPMU on the corrosion inhibition of mild steel in thin electrolyte layer. The results show that BPMU has the better protection effect compared with MPMU. Adsorption of BPMU and MPMU on steel surface was investigated by X-ray photoelectron spectroscopy (XPS). It was shown that one BPMU molecule has two N atoms to coordinate with one Fe atom, and that one MPMU molecule has one N atom to coordinate with one Fe atom. The quantum chemical parameters were obtained by PM3 semi-empirical method. BPMU has the smaller HOMO-LUMO energy gap and the smaller net positive charge intensities of 4N and 8N atoms in its molecule. 相似文献
13.
Ramazan Kahraman Huseyin Saricimen Mesfer Al-Zahrani Salah AlDulaijan 《Journal of Materials Engineering and Performance》2003,12(5):524-528
This study examined experimentally different chemicals for inhibition of steel corrosion in a simulated aqueous solution for
the industrial marine atmosphere of the Arabian Gulf region. The literature reported various inhibitors that can help in protection
against metal corrosion in aqueous environments. Among them, 10 inhibitors (calcium silicate, cyclohexylamine, n-methylcyclohexylamine,
dicyclohexylamine nitrite, sodium benzoate, sodium nitrate, sodium nitrite, sodium phosphate, sodium dihydrogen orthophosphate,
and magnesium nitrate hexahydrate) were obtained and corrosion resistance of inhibitor applied steel specimens were examined
in the simulated solution (2 wt.% NaCl and 1 wt.% Na2SO4). Test specimens were prepared from locally produced reinforcing steel products. Treatment of steel with either dicyclohexylamine
nitrite or sodium dihydrogen orthophosphate both at 10 mM concentration for 1 day at room temperature resulted in significant
inhibition of corrosion. No significant improvement in corrosion inhibition was observed either with an increase in inhibitor
concentration at room temperature or with an increase in inhibitor application temperature at 10 mM concentration. A further
study is planned to examine the inhibition performances of the two inhibitors under actual atmospheric conditions in the Arabian
Gulf region (industrial marine environment). 相似文献
14.
The interaction of dicyclohexyl ammonium nitrite (DICHAN) and dicyclohexylamine (DICHAMIN) on substrates of pure iron and platinum were investigated by ellipsometry. The initial immersion phase (≤ 100 min) under isothermal conditions (20°C) in air of relative humidity (RH) = 0 or (RH) = 100% was investigated. It is shown, that DICHAN is intensively adsorbed on the primary oxide layer of iron materials and causes effective hydrophobing. DICHAMIN to a lower extent decreases the adsorbability of water and when influenced by air of (RH) = 0%, it is completely desorbed. On the basis of the results presented, the actual views on the active principles of vapour phase inhibitors of the iron materials' atmospheric corrosion are defined. 相似文献
15.
16.
炼油厂闲置设备保护用气相缓蚀剂的研制 总被引:2,自引:0,他引:2
在实验室制得了V2复合型气相缓蚀剂,采用静态、动态粉末法、密闭空间挥发减量试验、现场保护试验等方法进行了性能评价,并采用模拟大气腐蚀状态的电化学测试技术对其缓蚀机理进行了初步研究。结果表明,V2是一种性能优良、有实用前景的钢用气相缓蚀剂。 相似文献
17.
曼尼希碱缓蚀剂在盐酸中对N80钢缓蚀性能 总被引:1,自引:1,他引:0
目的制备一种新型曼尼希碱缓蚀剂并研究其性能。方法利用失重法研究缓蚀剂缓蚀效率与缓蚀剂的质量浓度、盐酸质量分数、腐蚀温度、腐蚀时间的关系,确定缓蚀剂的吸附曲线。通过动电位极化曲线法和交流阻抗法研究缓蚀剂的综合性质。利用扫描电镜观察腐蚀前后N80钢片的表面形态。结果缓蚀剂缓蚀效率随缓蚀剂添加量的增大而增大,随测试温度的升高而下降,随盐酸质量分数的升高先增大后减小,随腐蚀时间的延长先增大后减小。60℃时,在质量分数为15%盐酸中浸入4 h、缓蚀剂添加量在1.0 g/L的条件下,缓蚀剂缓蚀效率为99.18%,腐蚀反应的活化能由56.34 k J/mol提高到了86.54 k J/mol。缓蚀剂在N80钢表面符合Langmiur吸附模型,吸附吉布斯自由能为-29.94 k J/mol。极化实验结果显示该缓蚀剂为以阴极抑制为主的混合型缓蚀剂。阻抗谱图显示添加缓蚀剂后,阻抗明显增大。扫描电镜结果显示缓蚀剂有效抑制了盐酸对N80钢片的腐蚀。结论所制备的缓蚀剂在质量分数为15%的盐酸中对N80钢片有良好的缓蚀效果。 相似文献