Application Of Aloe Vera As Green Corrosion Inhibitor For Aluminum Alloy Types Aa8011 And Aa8006 In 3.5% Nacl

This paper presents testing data on application possibilities of Aloe Vera as green corrosion inhibitor for aluminum alloy types AA8011 and AA8006 in 3.5% NaCl. Electrochemical DC linear polarization method has been used in the first phase of testing process, with the goal of determining the optimal concentration of Aloe Vera as inhibitor of mentioned alloys in 3.5% NaCl, by polarization resistance value. During first testing process, only one aluminum alloy type AA8011 was used. By adding the inhibitor in 3.5% NaCl, the polarization resistance increases, and the highest result was recorded in Aloe Vera concentration of 5 cm(3)dm(-3). During second phase of testing, the inhibition effect of optimal Aloe Vera concentration was tested for aluminum alloy type AA8011 and AA8006 in 3.5% NaCl by curves of Taffel extrapolation method. The results of conducted tests show that Aloe Vera in concentration of 5 cm(3)dm(3) can be used as green inhibitor for aluminum alloys type AA8011 and AA8006 of the Al-Fe-Si-Mn system, in 3.5% NaCl at room temperature (20 +/- 2 degrees C). All tested samples of aluminum alloy in 3.5% NaCl solution with the presence of inhibitor show significant shifting of Open Circuit Potential (E-OCP) towards positive values in respect with Open Circuit Potential (E-OCP) of treated aluminum alloy samples in 3.5% NaCl solution without inhibitor presence. Likewise, most of the samples treated in 3.5% NaCl solution with the presence of inhibitor lead to decrease of corrosion current density in relation to samples tested in 3.5% NaCl solution without inhibitor presence.