Characterization of Anodizing Process on Aluminum Series 6 with Variable Voltage

Abstract

Anodizing is one way of coating oxidation on aluminum, which is carried out by anodic oxidation at room temperature with the help of an electric current so that a chemical reaction occurs so that a layer is produced that can protect the metal from the effects of corrosion. The objective of this study was to determine the characterization of variations in electric voltage on surface hardness in the anodizing aluminum series 6. Specimens were made with dimensions of 50 mm × 25 mm with a thickness of 10 mm, then the cleaning process was carried out with a solution of sodium carbonate (Na 2 CO 3 ) with a concentration of 50 gr/100 ml of reverse osmosis (RO) water. The etching, desmut, and anodizing processes were continued with a solution concentration of 400 ml of sulfuric acid (H 2 SO 4 ) and 600 ml of RO water. The electric voltage variables used were 20, 24, and 28-V with a current of 2 A and an immersion time of 10 min. The results of the highest hardness test on a variable voltage of 20-V with a Vickers hardness value of 59.117 VHN. This proves that anodizing treatment on the surface of aluminum material with a variable voltage of 20 V will produce a high Vickers hardness value. These results indicate that the toughness of the material on the anodized specimen is also affected by the magnitude of the electric voltage.

Experimental analysis of anodic coating process parameters of Al 5754 alloy by response surface method

“…A minimum porosity and maximum corrosion resistance was achieved by direct pulse voltage [24]. Wisnujati et al characterized that anodizing process on the 6-series aluminum alloy with different voltage change from 20 V to 28 V. According to their study, a maximum Vickers hardness value of coated surface is 59.117 VHN at voltage of 20 V [25]. Park and Jeong studied the effect of anodizing voltage (50 V and 60 V) and time (1 h − 9 h) of 6061 aluminum alloy (0-5 h) on the formation of anodic oxide film.…”