沉积时间对Al-Mg合金的形貌、组分和防腐性能的影响

In this paper, Al-Mg alloy coatings were electroplated on tungsten wire surface in an inorganic molten salt AlCl3-NaCl-KCl-MgCl2 system for potential application in z-pinch experiments. Scanning electron microscope, energy spectrum and X-ray diffraction were used to characterize the surface morphology, composition, valence state of elements and crystal structure of the coatings. Ac impedance tests were employed to evaluate the corrosion protection performance. The results showed that the surface morphology of the electrodeposited Al-Mg alloy coating is smooth and the crystalline grains are uniform with the increase of the electrolysis time, and Mg content is also increased. The structures of the coatings are composed of the amorphous Al-Mg alloy solid solution and the Al crystal with a face-centered cubic structure. Al-Mg alloy coatings possessed an improved corrosion resistance with the increase of the electrolysis time based on the analysis of the electrochemical impedance spectroscopy in 3.5wt% NaCl solution. .