载无机缓蚀剂的LDH转化涂层对AZ31的腐蚀。

B. Pillado, M. Mohedano, R. del Olmo, B. Mingo, E. Matykina, R. Arrabal
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引用次数: 0

摘要

:研制了AZ31镁合金层状双氢氧化物(LDHs)涂层。在共沉淀条件下制备LDH涂层,并在水热条件下应用。研究了Zn-Al LDH和Li-Al LDH两种不同体系。样品在45℃下分别在na2wo4·h2o或lino3中浸泡2 h,得到Zn-Al LDH(W)和Li- al LDH(Li)。采用场发射扫描电镜(FESEM)、x射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对涂层进行了表征。采用电化学阻抗谱(EIS)和扫描振动电极技术(SVET)对腐蚀过程进行了研究。并用环氧底漆对表面进行了水滴接触角测试和涂料附着力测试。涂层的表征揭示了具有较致密的内层和片状外层的双层涂层。两种涂层均提高了AZ31合金的耐蚀性。加载缓蚀剂进一步提高了一个数量级的耐蚀性(裸基板,Z 10mHz⁓102 Ω cm2;LDH, z10mhz⁓103-4 Ω cm2;ldh抑制剂,z10mhz⁓105 Ω cm2)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Corrosion of AZ31 with LDH conversion coatings loaded with inorganic inhibitors.
: Layered Double Hydroxides (LDHs) coatings were developed for corrosion protection of AZ31 Mg alloy. LDH coatings were fabricated under co-precipitation conditions and applied under hydrothermal conditions. Two different systems Zn-Al LDH and Li-Al LDH were studied. Specimens were post-treated via immersion for 2 h at 45 ºC in Na 2 WO 4 ·H 2 O or LiNO 3 baths respectively, to produce Zn-Al LDH(W) and Li-Al LDH(Li). The characterization of the coatings was carried out by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The corrosion process was studied by electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Surface was also evaluated by water drop contact angle and paint adhesion test by using an epoxy primer. The characterization of the coating revealed two-layered coatings with a denser inner layer and a flaky outer layer. Both coatings improved the corrosion resistance of the AZ31 alloy. Loading with inhibitor further increased the corrosion resistance by one order of magnitude (Bare substrate, Z 10mHz ⁓ 102 Ω cm2 ; LDH, Z 10mHz ⁓ 103-4 Ω cm2 ; LDH-inhibitor, Z 10mHz ⁓ 105 Ω cm2 ).
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