Long-term corrosion inhibition for AA5052 aluminum alloy by an eco-friendly hybrid inhibitor: Synergism inhibition between rosemary extract and zinc chloride in 0.05 M NaCl solution

The long-term corrosion inhibition for AA5052 aluminum alloy was achieved by the hybrid inhibitor combined by rosemary extract (RSE) and zinc chloride (ZnCl 2 ) which could offer more than 30 days of protection for AA5052 Al alloy in a 0.05 M NaCl solution. The highest efficiency of ZnCl 2 , RSE, and hybrid inhibitor (ZR) reached 67.34 %, 88.41 % and 96.48 % at 2000 ppm, respectively. The excellent inhibition performance of the hybrid inhibitor was attributed to the synergism between RSE and ZnCl 2 . The electrochemical measurements show that the long-term inhibition performance is due to the combination of adsorption film and Zn oxide/hydroxide precipitated film.