The influence of surfactant synergism between sodium dodecyl benzene sulfonate (SDBS) and N,N-dimethyldodecan-1-amine Oxide (DDAO) on zinc corrosion in 0.05 M hydrochloric acid (HCl) solutions at 25 °C was investigated. Firstly, solutions of SDBS and DDAO with mole fractions of 0.00, 0.25, 0.50, 0.75 and 1.00 were prepared and their surface tension and critical micelle concentration (CMC) values in water and in 0.05 M HCl were measured as a function of total surfactant concentration. The SDBS/DDAO mixed system exhibited a strong synergism in 0.05 M HCl with a highly negative interaction parameter β (average β = −23.46), according to regular solution theory. Secondly, the adsorption of single surfactants SDBS and DDAO and SDBS/DDAO surfactant mixture on 2.0% zinc powder was investigated by the depletion method to find out the role of synergism in the adsorption tendency of these surfactants on the zinc surface and thus their corrosion inhibiting effect. The adsorption tendency of single surfactant and the mixed surfactant systems onto 2.0% zinc powder followed the order: SDBS > 0.75 SDBS/0.25 DDAO ≈ 0.25 SDBS/0.75 DDAO > DDAO > 0.50 SDBS/0.50 DDAO. Finally, the corrosion of zinc was investigated using the potentiodynamic polarization technique. It was found that SDBS and DDAO act as efficient corrosion inhibitors for zinc in 0.05 M HCl solution with increasing corrosion inhibition efficiency when they are mixed. Additionally, images of scanning electron microscopy were obtained for zinc sheets in solutions containing single and mixed SDBS/DDAO surfactants in the presence and absence of 0.05 M HCl. The microscopic images show an improvement in the protection of the zinc surface against acid attack in the presence of single and mixed SDBS/DDAO surfactants.

中文翻译：

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十二烷基苯磺酸钠 (SDBS) 和 N,N-二甲基十二烷-1-氧化胺 (DDAO) 在单一和混合体系中作为盐酸中锌的缓蚀剂

研究了十二烷基苯磺酸钠 (SDBS) 和 N,N-二甲基十二烷-1-氧化胺 (DDAO) 之间的表面活性剂协同作用对 25 °C 下 0.05 M 盐酸 (HCl) 溶液中锌腐蚀的影响。首先，制备摩尔分数分别为 0.00、0.25、0.50、0.75 和 1.00 的 SDBS 和 DDAO 溶液，并测量它们在水中和 0.05 M HCl 中的表面张力和临界胶束浓度 (CMC) 值作为总表面活性剂浓度的函数. SDBS/DDAO 混合体系在 0.05 M HCl 中表现出很强的协同作用，具有高度负的相互作用参数β（平均的β= -23.46)，根据正则解理论。其次，通过耗尽法研究了单一表面活性剂 SDBS 和 DDAO 以及 SDBS/DDAO 表面活性剂混合物在 2.0% 锌粉上的吸附作用，以找出协同作用在这些表面活性剂在锌表面的吸附趋势和缓蚀性中的作用。影响。单一表面活性剂和混合表面活性剂体系对2.0%锌粉的吸附趋势依次为：SDBS > 0.75 SDBS/0.25 DDAO ≈ 0.25 SDBS/0.75 DDAO > DDAO > 0.50 SDBS/0.50 DDAO。最后，使用动电位极化技术研究了锌的腐蚀。结果表明，SDBS 和 DDAO 在 0.05 M HCl 溶液中作为锌的有效缓蚀剂，当它们混合时，缓蚀效率提高。此外，在存在和不存在 0.05 M HCl 的情况下，获得了含有单一和混合 SDBS/DDAO 表面活性剂的溶液中锌片的扫描电子显微镜图像。显微图像显示，在存在单一和混合 SDBS/DDAO 表面活性剂的情况下，锌表面对酸侵蚀的保护能力有所提高。