Effect of surface roughness on glossiness of a 5052 aluminum alloy

TLDR: In this article, the surface texture of aluminum alloy is determined by the glossiness and the three factors of surface roughness: arithmetical mean Ra, period of roughness proˆle and slopes of the roughness.

Abstract: In this paper, the eŠects of topography with diŠerent rough surfaces on glossiness are investigated experimentally in order to characterize a surface texture of an aluminum alloy A5052H34. The surface texture of aluminum alloy is determined by the glossiness and the three factors of surface roughness: arithmetical mean Ra, period of roughness proˆle and slopes of the roughness. The surface of sample used in the experiment has diŠerent rough surfaces due to diŠerent cutting process. The topography of sample was measured by using a mechanical stylus proˆlometry. The periodic of roughness was evaluated by mean width of the proˆle elements RSm. The experimental results showed that the glossiness slightly increased as Ra decreased. As glossiness increased, RSm decreased. These means that the surface with low amplitudes and short wavelengths of the roughness results in high glossiness values. Moreover, histogram of the re‰ection angle calculated roughness proˆle showed that the specular re‰ection values of glossiness decreased as the diŠuse re‰ection values increased. Thus the local slopes of the roughness correlate strongly with the glossiness. These results clearly veriˆed that the proposed method for evaluating the surface texture of aluminum alloy was eŠective. (Received October 2, 2002)