چكيده به لاتين
In this study, the effect of hard anodizing parameters with pulsed current on the properties of oxide layers formed in acid electrolyte on 1100 aluminum and 7075-T6 aluminum was investigated. After preparing 1100 aluminum and 7075-T6 aluminum samples, the pulse hard anodizing process under maximum current density 2, 3, 4 A/(dm^2 ), times 60, 120, 180, 240 min, minimum current density 0 A/(dm^2 ), frequency 250Hz, duty cycle 50%, on and off pulse width each 2 ms and temperature +5°C, in a solution containing sulfuric acid with the concentration of 160 g/l and oxalic acid with the concentration of 10 g/l, then samples with water The distillates were washed and dried. After performing the coating process on the samples, thickness measurement, microhardness measurement and abrasion test were performed. Considering the thickness, microhardness, and weight loss due to abrasion, it was concluded that the optimal conditions for creating an oxide layer with maximum hardness and thickness and the minimum amount of weight loss due to wear, 50% duty cycle, frequency 250Hz, maximum current density 3 A/(dm^2 ), the minimum current density is 0 A/(dm^2 ) and the time is min120. The oxide layer formed on aluminum 1100 sample in these conditions had the thickness of 131 µm, hardness of 596 HV, and weight loss of 2.3 mg, for aluminum 7075-T6 samples, it had the thickness of 123 µm, hardness of 446 HV, and weight loss of 2.7 mg. . By Comparing the results of thickness measurement, hardness measurement and abrasion test for 1100 and 7075-T6 samples, it was concluded that 1100 samples in exactly the same coating conditions as 7075-T6 samples, with thickness, microhardness and strength They have a higher wear due to the presence of alloying elements and intermetallic compounds in aluminum 7075-T6 and the effect of these elements on the anodizing process is difficult.
