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Sodium dodecyl sulfate (SDS) intercalated MgAl layered double hydroxides film to enhance the corrosion resistance of AZ31 magnesium alloy
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2021-07-18 , DOI: 10.1016/j.surfcoat.2021.127524
Yulai Song 1 , Haiyang Wang 1 , Qing Liu 1 , Gaojie Li 1 , Shengwei Wang 1 , Xianyong Zhu 2
Affiliation  

Mgsingle bondAl layered double hydroxides (LDHs) films intercalated with nitrate, molybdate, and sodium dodecyl sulfate (SDS) were in situ fabricated on AZ31 magnesium alloy by a combination of co-precipitation and hydrothermal method. The morphology, chemical composition and structure of the LDHs films were characterized by SEM, EDS, XPS, XRD and FT-IR. The corrosion resistance of the LDHs films was investigated by potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and hydrogen evolution tests. The results show that the three LDHs films are dense and uniform, and closely adhere to the magnesium substrates. The corrosion resistance of the LDHs films is ranked in order as follows: MgAl-MoO42−-LDHs < MgAl-NO3-LDHs < MgAl-SDS-LDHs. The SDS intercalated LDHs film exhibits the best corrosion protection performance, attributed to the physical barrier effect of the dense film structure, anion-exchange capacity of LDHs, and the adsorption and cathodic inhibition of SDS anions.



中文翻译:

十二烷基硫酸钠(SDS)插层镁铝单键层状双氢氧化物膜增强AZ31镁合金的耐蚀性

单键通过共沉淀和水热法的结合,在 AZ31 镁合金上原位制备了插入有硝酸盐、钼酸盐和十二烷基硫酸钠 (SDS) 的镁铝层状双氢氧化物 (LDHs) 薄膜。通过SEM、EDS、XPS、XRD和FT-IR对LDHs薄膜的形貌、化学成分和结构进行了表征。通过动电位极化曲线、电化学阻抗谱(EIS)和析氢测试研究了LDHs薄膜的耐腐蚀性能。结果表明,三种LDHs薄膜致密均匀,与镁基体紧密结合。LDHs 薄膜的耐蚀性排列如下: MgAl-MoO 4 2- -LDHs < MgAl-NO 3 --LDH < MgAl-SDS-LDH。SDS插层LDHs膜表现出最好的腐蚀防护性能,这归因于致密膜结构的物理屏障作用、LDHs的阴离子交换能力以及SDS阴离子的吸附和阴极抑制作用。

更新日期:2021-07-20
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