The Effect of Electrolyte Concentration and Electric Current on the Quality of Surface Coloring on Anodized Aluminum

Abstract

The use of aluminum metal in daily life has widely used coloring techniques to enhance the aesthetic value of the metal. Aluminum anodizing process can produce porous on the metal surface. The formed porous can be used to store and hold the coloring agent to make them more durable. The research intends to observe the coloring characteristics on the aluminum surface influenced by several parameters of the anodizing process, including electrolyte concentration and electric current. In this study the current H2SO4 concentration was used as a variable to improve the quality of staining on anodized aluminum surfaces. The anodization process was carried out on H2SO4 electrolyte solution with variations in concentrations of 10% to 20% and the current density used was 3 A to 5 A. The tests were carried out using micro Vickers to observe the hardness value. The hardness was higher at lower concentration of electrolyte solution due to thinner layer of oxide film, scanning electron microscope to observe the structure and visual observations for anodized color quality. From the results given, the tendency of the lower current density the size and density of porous lower. With the same condition, the color was darker than higher current density.

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

“…However, its application range has been restricted due to corrosion phenomena [9,10]. Thus, aluminum components are often subjected to a surface anodizing process [11][12][13][14][15][16], to improve their protective properties [17,18], chemical resistance [19,20] and also their aesthetic features [21,22]. As a consequence of the health emergency, even the anodized aluminum surfaces must be modified and made naturally antibacterial, to avoid the spread of the virus without the need for continuous disinfection of public spaces.…”

Innovative Codeposition of a Ag–Al2O3 Layer: An Attractive Combination of High Durability and Lack of Cytotoxicity for Public Space Applications

“…To overcome the obvious lack of durability, 7 , 8 aluminum surfaces are usually subjected to the anodizing process, 9 − 12 which improves the protective performance of the component, 13 , 14 its chemical resistance, 15 , 16 and aesthetic features over time. 17 , 18 Hence, to produce inherently antimicrobial surfaces, anodized aluminum has recently been the subject of several implementation studies. 19 − 21 …”

“…Aluminum is one of the most used materials for the construction of surfaces and components in public spaces, − thanks to an interesting combination of technological properties, such as high specific strength, thermal conductivity, workability, low density, low cost, and pleasant appearance. To overcome the obvious lack of durability, , aluminum surfaces are usually subjected to the anodizing process, − which improves the protective performance of the component, , its chemical resistance, , and aesthetic features over time. , Hence, to produce inherently antimicrobial surfaces, anodized aluminum has recently been the subject of several implementation studies. − …”