Evaluation of Additives as Corrosion Inhibitors/Antioxidants for High Quality Nano Emulsifiable Oils of Metalworking Fluids
Evaluation of Additives as Corrosion Inhibitors/Antioxidants for High Quality Nano Emulsifiable Oils of Metalworking Fluids
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DOI：
10.4236/jsemat.2014.43019
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
N. Mehbad
中科院分区：
文献类型：
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作者：
N. Mehbad
用于配制金属加工液的表面活性剂。本文采用失重法测定了合成的化学结构为H21C10O-Ph-N=N-Ph-SO3Na和1-乙基-1-十二烷基-2-磺酸-4-（羟基乙基）-哌嗪的阴离子表面活性剂对癸氧基-对磺胺二偶苯钠对碳钢在硫酸溶液中的缓蚀作用。研究了这些抑制剂的浓度与其表面性质、热力学性质、表面覆盖率和抑制效率之间的关系。结果表明，在高酸性条件下，对癸氧基对磺酸偶氮苯钠的合成性能优于1-乙基-1-十二烷基-2-磺酸-4-（羟基乙基）-哌嗪。这些抑制剂与偶联剂混合产生水混溶切削液。测定了这些添加剂在水相中的表面张力值，从而测定了所有抑制剂的CMC。这些抑制剂的效率取决于它们的化学结构和亲水性基团的存在，从而使表面活性剂与金属表面结合，因此具有很好的润湿性能。表面活性剂的抗腐蚀性能随着芳香族中极性键的增加而增加，形成螯合配位层。这是由于金属表面化学吸附位置的增加。这些研究为表面活性剂的化学结构与其效率之间的密切关系提供了许多明确的证据。通过测量表面活性剂在水相中每分子所占的面积，进一步证实了上述机理。结果表明，两性表面活性剂比阴离子表面活性剂更有效。根据其热力学参数，评价了不同剂量抑制剂的抗氧化活性，并提出了机理。油的氧化经过了不同的时间间隔。通过总酸形成监测了油的降解情况。
Surfactants used for formulation metal working fluids. In the present paper, the inhibitive effect of synthesized anionic surfactant P-decyloxy p-sodium sulphonateazobenzene with chemical structure H21C10O-Ph-N=N-Ph-SO3Na and 1-ethyl-1-dodecyl-2-sulphonate-4-(hydroxyl ethyl)-piprazine on the corrosion of carbon steel in sulphuric acid solution is measured by the weight loss method. The relationships between the concentrations of these inhibitors and their surface properties, thermodynamic properties, surface coverage and inhibiting efficiency, have been investigated. The results indicate that P-decyloxy p-sodium sulphonate azobenzene is superior to 1-ethyl-1-dodecyl-2-sulphonate-4-(hydroxyl ethyl)-piprazine at high acid concentration. These inhibitors blend with coupling agent to produce water miscible cutting fluid. Values of surface tension of these additives were measured in water phase and consequently CMC was determined for all inhibitors. The efficiency of these inhibitors depends on their chemical structure and the presence of hydrophilic group to association of the surfactant with metal surface, hence very good wetting properties. The anti-corrosion characteristic of surfactants increases with increasing polar linkages in the aromatic moieties forming chelated and coordinated layer. This is due to the increase in number of sites to chemisorption on the metal surface. These studies have led to much clear evidence of the intimate relationship between the chemical structure of the surfactants and their efficiency. More confirmation for suggested mechanism was investigated by measuring the area occupied per molecule of the surfactant at aqueous phase. The results indicate that the amphoteric surfactant more efficient than anionic surfactant. The antioxidants activities of different dosages of inhibitors were evaluated and suggested mechanism according to their thermodynamics parameters. The oxidation of the oil has been carried for different time intervals. The degradation of the oil has been monitored by total acid formation.