CAJ | 학술논문

采用共沉淀法制备Zn-Al-[V10O28]6-双层氢氧化物(以下简称LDH-V)，研究不同添加浓度(0.0、0.25×10-3、0.75×10-3、1.5×10-3、3.0×10-3 mol?L-1)的LDH-V对LY12铝合金溶胶-凝胶涂层形貌、耐蚀性的影响.采用扫描电子显微镜(SEM)和傅里叶变换红外(FTIR)光谱研究LDH-V对涂层形貌和结构的影响.运用中性盐雾实验对涂层进行耐蚀性评估.利用电化学方法对涂层在0.05 mol?L-1的NaCl溶液中的腐蚀行为进行研究.探讨加入LDH-V后溶胶-凝胶涂层的耐蚀机理.结果表明，一定量LDH-V的加入不仅可以提高溶胶-凝胶涂层的耐蚀性能，还可对涂层被破坏区域进行自修复，起到延缓铝合金基体腐蚀的作用.然而，当LDH-V的添加溶度超过一定值时，会破坏涂层的完整性并降低涂层的腐蚀防护性能.实验结果表明LDH-V最佳的添加浓度为1.5×10-3 mol?L-1.
채용공침정법제비Zn-Al-[V10O28]6-쌍층경양화물(이하간칭LDH-V)，연구불동첨가농도(0.0、0.25×10-3、0.75×10-3、1.5×10-3、3.0×10-3 mol?L-1)적LDH-V대LY12려합금용효-응효도층형모、내식성적영향.채용소묘전자현미경(SEM)화부리협변환홍외(FTIR)광보연구LDH-V대도층형모화결구적영향.운용중성염무실험대도층진행내식성평고.이용전화학방법대도층재0.05 mol?L-1적NaCl용액중적부식행위진행연구.탐토가입LDH-V후용효-응효도층적내식궤리.결과표명，일정량LDH-V적가입불부가이제고용효-응효도층적내식성능，환가대도층피파배구역진행자수복，기도연완려합금기체부식적작용.연이，당LDH-V적첨가용도초과일정치시，회파배도층적완정성병강저도층적부식방호성능.실험결과표명LDH-V최가적첨가농도위1.5×10-3 mol?L-1.
Zn-Al-[V10O28]6-layered double hydroxide (LDH-V) as a type of corrosion inhibitor was prepared with the co-precipitation method using one solution containing zinc and aluminum nitrates precursors and a second solution containing Na3VO4, where the decavanadate anion is speciated at pH 4.5. The hybrid sol-gel solution was prepared from 3-glycydoxypropyltrimethoxysilane (GPTMS) as the organic precursor sol and zirconium n-propoxide (TPOZ) as the inorganic precursor sol. The doped coatings were obtained by dip coating the way that the samples were immersed into solutions with different LDH-V concentrations (0.0, 0.25×10-3, 0.75×10-3, 1.5×10-3, 3.0×10-3 mol?L-1). The morphology and corrosion resistance of the sol-gel coating doped with different LDH-V concentrations were studied. The sol-gel coatings were investigated by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The salt spray test was used to evaluate the corrosion resistance of the different coatings. The corrosion behavior of the coatings was evaluated by electrochemical impedance spectroscopy (EIS) during immersion in 0.05 mol?L-1 NaCl solution. The results showed that LDH-V not only improves the corrosion resistance of the coating, but also provides a function for self-healing of broken coatings. However, when the LDH-V doping concentration was high, it destroyed the integrity of the coatings and decreased the corrosion resistance of the coatings. The best LDH-V doping concentration was 1.5×10-3 mol?L-1.