毕业论文-缓蚀剂协同作用研究,共31页,18907字。
摘要:本文用极化曲线法和电化学阻抗技术研究了喹啉(QL)与硫脲(TU)复配对N80钢在50℃模拟气井采出水腐蚀介质中的腐蚀行为以及曼尼希碱(MABS)与硫脲(TU)复配对N80钢在50℃含一定量S2-的酸溶液的腐蚀介质中的缓蚀行为。结果表明,硫脲是一种混合型缓蚀剂,对N80钢的阴极和阳极都有强烈的抑制作用;喹啉和曼尼希碱是一种以抑制阴极为主的混合型缓蚀剂。喹啉与硫脲及曼尼希碱和硫脲复配后,对模拟气井采出水和含一定量S2-的酸溶液的腐蚀介质都表现出优异的缓蚀协同作用。结论,喹啉和曼尼希碱分别与硫脲复配均可形成一种复合型缓蚀剂,作用方式是“负催化效应”。曼尼希碱和喹啉分别与硫脲复配后,可能在N80钢表面形成一种双层结构的吸附膜,底部以硫脲为主,顶部以曼尼希碱和喹啉为主。
关键词:缓蚀剂; 协同作用; 喹啉; 曼尼希碱; 硫脲
Abstract: This paper studies the quinoline (QL) with thiourea (TU) with polarization curves and electrochemical impedance matching N80 steel complex at 50 ℃ analog wells produced water corrosion medium corrosion behavior and Mannich bases (MABS) and thiourea (TU) N80 steel complex at 50 ℃ paired with a certain amount of S2- corrosive acid solution in the corrosion behavior.The results showed that thiourea is a mixed type inhibitor for N80 steel cathode and anode has a strong inhibition ; quinoline and Mannich bases to suppress a cathode based mixed type inhibitor . Quinoline and the Mannich base and thiourea and thiourea complex , produced water and gas to simulate corrosive acid solution containing a certain amount of S2- exhibited excellent corrosion synergy.Conclusion , quinoline and Mannich bases respectively thiourea complex can form a complex type inhibitor mode of action is "negative catalytic effect ." Mannich bases , respectively , and the quinoline thiourea compound , may be formed on the steel surface N80 adsorbed film of a double layer structure , the bottom of the thiourea based, a Mannich base and top with quinoline -based.
Keywords : Corrosion; Synergy;Quinoline; Mannich ;Thiourea
目录
1 绪论 1
1.1 研究背景及意义 1
1.2 腐蚀的概述 1
1.2.1 腐蚀的基本概念 1
1.2.2 腐蚀的机理 2
1.2.3 腐蚀种类 2
1.3 缓蚀剂的概述 4
1.3.1 缓蚀剂的概念 4
1.3.2 缓蚀剂的作用机理 4
1.3.3 缓蚀剂的分类 6
1.4 国内外油田缓蚀剂的研究现状 6
1.5 本文主要研究内容 8
2 实验部分 10
2.1 实验药品及仪器的介绍 10
2.2 实验试样及其制备 11
2.2.1 腐蚀介质及其制备 11
2.2.2 缓蚀剂的制备 11
2.2.3 盐桥的制备 11
2.3 实验方法 12
2.3.1 电化学方法 12
2.3.2 静态失重法 12
2.4 实验步骤 13
3 实验结果讨论 14
3.1 含941mg/LS2-的酸溶液的腐蚀介质 14
3.1.1 极化曲线 14
3.1.2 交流阻抗 17
3.1.3 曼尼希碱和硫脲缓蚀协同作用机理探讨 18
3.2 模拟气井采出水腐蚀介质 19
3.2.1 极化曲线 19
3.2.2 交流阻抗 22
4 结论 25
参考文献 26
致谢 28
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