Determining Optimum Anodic Oxidation Parameters for Hardness and Wear Properties of AA7075-T6 Alloys Using Taguchi Design

In this study, the main goal is to determine the effects of the variable anodic oxidation process parameters on the hardness and wear properties of the AA7075-T6 alloy, which is widely used in the gun industry, automotive, aircraft, and space industry. Samples obtained using the process parameters designed by the Taguchi method were subjected to various experiments and the findings obtained from these experiments were compared with S/N graphs determined using ANOVA analysis. As a result of these findings, it was determined that different coating thickness, hardness and wear resistance were obtained by varying the anodic oxidation process parameters. The highest oxide layer thickness obtained was determined as 70.63 µm. In addition, the oxide layer formed by the anodic oxidation process has significantly increased the hardness and wear resistance of the AA 7075-T6 alloy. Also, as a result of the experiments and ANOVA analysis, it was determined that the oxide layer obtained with the parameters of 22V constant voltage, 1.3A/dm2 current density, 2°C temperature, 140 minutes of processing time will have the superior wear performance.

Anodic Growth Behavior of TiO2 Nanotube Arrays with Process Parameter Control

TiO2 nanotube arrays are very attractive materials by their vertically aligned porous nanostructures. They are easy to make using an anodic oxidation process in organic and inorganic electrolytes containing halogen ions, like fluorine and chlorine. Their growth tendency, various microstructures of TiO2 nanotube arrays, was fabricated and analysed with controlling of anodic oxidation process parameter like applied voltage, process time, electrolyte temperature, concentration of ammonium fluoride and DI water in ethylene glycol electrolyte, voltage applying and dropping rate, grain orientation, and size of titanium foil. Pore diameter and length were controlled in the range of 16 nm to 178 nm and 0.2 μm to 14.6 μm, respectively. Some tendencies of their growth were observed with different anodic oxidation variables. This growth tendency of TiO2 nanotube arrays is should be considered before they used in many applications, and if optimal structure for each application was fabricated and used, they will show better performance.