<![CDATA[Aluminum 5058 is widely used in engineering components because it has low density, good corrosion resistance, and stable surface performance. However, anodizing can change its surface characteristics through an electrochemical oxidation reaction that forms an aluminum oxide layer and modifies surface topography. This study aims to analyze the effect of anodizing on the surface roughness and density of aluminum 5058 compared with non-treatment specimens. The research used a quantitative experimental method with aluminum specimens measuring 2×2 cm. Surface roughness was tested at the BRIN Laboratory according to ISO 21920-2:2021 at three measurement points using , , and parameters, while density was measured using the Archimedes method. The results showed that anodized specimens had average values of 0.59 µm, 4.78 µm, and 0.77 µm, whereas non-treatment specimens had 0.20 µm, 1.54 µm, and 0.28 µm. These results indicate that anodizing forms a rougher oxide texture on the aluminum surface. Density testing showed values of 2.7058 g/cm³ for non-treatment specimens and 2.7088 g/cm³ for anodized specimens, with a very small difference of 0.0030 g/cm³. Therefore, anodizing significantly affects surface topography but does not substantially change material density. This finding confirms that anodizing is mainly a surface modification process.]]>
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