Corrosion Inhibition of Mild Steel by Amphoteric Surfactants
Corrosion Inhibition of Mild Steel by Amphoteric Surfactants
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DOI：
10.1002/(sici)1521-4052(199907)30:7
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发表时间：
1999-07
影响因子：
1.1
通讯作者：
Y. Barakat;A. M. Hassan;A. Baraka
中科院分区：
文献类型：
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作者：
Y. Barakat;A. M. Hassan;A. Baraka
研究了在2 5℃、4 0℃和6 5℃条件下，两性表面活性剂对低碳钢在PH3的3%氯化钠溶液中的缓蚀性能，以及在6 0 0和12 0 mg H2 S/L存在下的缓蚀性能。化学配方。其中R=C10H21(I)、C12H25(II)、C14H29(III)、C16H33(IV)、C18H37(V)。随着表面活性剂浓度的增加，E-corr向正值移动，I-corr减小。这些表面活性剂具有良好的在金属表面形成保护层的能力，即使在小浓度的表面活性剂存在的情况下也是如此。这归因于在同一分子中同时含有阴离子和阳离子部分的表面活性剂的两性性质，以及水溶液中氯离子的压力。表面活性剂的缓蚀效率随表面活性剂中烷基长度(R)的增加而增加。在协同效应中，P.I.值有一定程度的提高。
The corrosion inhibition of mild steel, in 3 % NaCl solution of pH3, by amphoteric surfactants was evaluated in absence and in presence of 600 and 1200 mg H 2 S/l and at temperatures of 25, 40 and 65°C. These surfactants have the general formula. formula chem. where R = C 10 H 21 (I), C 12 H 25 (II), C 14 H 29 (III), C 16 H 33 (IV), C 18 H 37 (V) The presence of surfactants in the aqueous solution affected both the cathodic and anodic polarization areas, the corrosion potential. E corr , shifted to more positive values and i corr , decreased with the increase of surfactants concentrations. These surfactants have a good ability to form protective layer on the metal surface even in the presence of small concentrations of the surfactant. This was attributed to the amphoteric properties of the surfactants which contain both anionic and cationic moiety in the same molecule and also to the pressure of Cl - ions in the aqueous solution. The inhibiting efficiency of the surfactants increased with the increase of the length of alkyl groups (R) in the surfactant. The value of P.I. increased to some extent in synergistic effect.