Papers by Keyword: Aluminized Coating

Abstract: Aluminized coatings were prepared on AZ91D magnesium alloy using pulsed bias magnetron sputtering. Effects of deposition temperature on the microstructure and corrosion resistance were studied. The microstructure, element distribution and hardness of the coatings were characterized using optical microscopy (OM), X-ray diffraction (XRD), glow discharge optical emission spectroscopy (GDOES), and microhardness tester, respectively. The corrosion behavior of the aluminized coatings was studied by measuring anodic polarization curves in 0.5 wt% NaCl solution and compared with that of bare AZ91D. Results show that the aluminized coatings are composed of a deposition layer and a diffusion layer. With deposition temperature increasing, the thickness of deposition layer decreases while diffusion layer thickness increases. The interdiffusion of Al element with other elements in AZ91D magnesium alloy substrate results in a metallurgical bonding of the coatings with substrate. The coatings are mainly composed of γ-Al and α-Mg phase. A small amount of β-Al₁₂Mg₁₇ phase appears at higher temperature of 450°C. The surface microhardness of magnesium alloy is obviously improved by the aluminized coatings. The hardness gradually decreases along the depth of aluminized coatings and the hardness gradient becomes smooth with the increasing of deposition temperature. The corrosion resistance of magnesium alloy is increased considerably by the aluminized coatings with more positive corrosion potential and an order of magnitude decrease of the corrosion rate than the bare magnesium alloy.

Abstract: Surface of the lamp reflector are plated a layer of aluminum. It is hard to accurately establish calculate model when use finite element software to analysis the temperature field. For this reason, a new temperature field calculate model of aluminum layer is presented. And it apply to calculate the temperature field of front fog(084). Finally use temperature field experiment to verify that the calculate model of aluminum layer is correct.