Corrosion protection of carbon steel by tetraphosphonates of systematically different molecular size
Corrosion protection of carbon steel by tetraphosphonates of systematically different molecular size
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DOI：
10.1016/j.corsci.2018.09.021
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发表时间：
2018-12
影响因子：
8.3
通讯作者：
Argyri Moschona;N. Pleşu;Gellert Mezei;A. Thomas;K. Demadis
中科院分区：
文献类型：
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作者：
Argyri Moschona;N. Pleşu;Gellert Mezei;A. Thomas;K. Demadis
在pH值为3的条件下，用XPS研究了六种系统变化的四磷酸盐分子与碳钢表面的相互作用。所有四磷酸盐[EDTMP (C2), TDTMP (C4), HDTMP (C6), ODTMP （C8）和DDTMP (C12)]都属于氨基膦酸盐家族，它们具有系统拉长的主链（从2到12个亚甲基分离N原子）。XPS研究对粉末样品和浸泡在水溶液中的碳钢样品进行了研究。XPS结果还表明，四膦酸分子在与碳钢表面相互作用时发生了明显的去质子化，四膦酸家族的表面相互作用导致添加剂通过磷酸盐基团在钢表面吸附。采用动电位极化和电化学阻抗谱研究了其缓蚀模式。电荷转移电阻（Rct）和恒相元（CPE）等阻抗参数的变化证实了金属表面的强吸附作用。利用衰减全反射-傅里叶变换红外光谱（ATR-FTIR）和光学显微镜研究了碳钢表面形成的保护层的性质。
We study the interaction of six systematically varied tetraphosphonate molecules with carbon steel surfaces by XPS at pH 3. All tetraphosphonates [EDTMP (C2), TDTMP (C4), HDTMP (C6), ODTMP (C8) and DDTMP (C12)] belong to the aminomethylene-phosphonate family, and they possess systematically elongated backbone (from two to twelve methylene groups separating the N atoms). XPS studies were performed on powdered samples and also on immersed carbon steel specimens in aqueous solutions. The XPS results also suggest that the tetraphosphonic acid molecules become significantly deprotonated upon interaction with the carbon steel surface and that the surface interaction of the tetraphosphonic acid family leads to additive adsorption on the steel surfaceviathe phosphonate groups. The mode of corrosion inhibition was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. The changes observed in the impedance parameters, like charge transfer resistance (Rct) and constant phase element (CPE) confirm the strong adsorption on the metal surface. The nature of the protective layer formed on the carbon steel surface was examined by Attenuated Total Reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy and optical microscopy.