Immobilization of Ni nanoparticles on micron aluminum and the corrosion characteristics of the Al/Ni bimetallic nanocompositeAuthor(s): Yi Wang, Wei Jiang, Hongying Liu, Fengsheng Li
The displacement method was employed to modify the surface of micron Al on which a layer of Ni nanoparticles were coated. NH4F acted as a key that enabled the displacement reaction occurring in neutral solution. PEG600 prevented Al from being corroded by water and restricted the overgrowth of Ni nanoparticles. Other parameters, such as NH4F and NiCl2·6H2O concentrations, were determined by experiment and discussion to be 0.2 mol·L-1 and 1.17 g·L-1, respectively. The fabricated Al/Ni bimetallic nanocomposites were corroded by hydrochloric acid solution and alkaline NaOH solution to investigate its corrosion characteristics. After being etched by the acidic solution, micron Al cores were eroded and Ni shells remained. However, the Ni shells broke into fragments after the Al cores were dissolved in the alkaline solution.