Aluminium alloys are used on aerospace and automotive industry due to excellences mechanical properties. Unfortunately, aluminium alloys are susceptible to corrosion and that limit them in some corrosive environments. The aim of this work is researching the characteristics of anodized film generated with sulfuric-citric acid through to electrochemical techniques. A 2024 aluminium alloy was used as substrate employing a mixture of sulfuric and citric with a current of 0.01 and 1 A at 25°C each one for 30 minutes. Electrochemical evaluation used was cyclic potentiodynamic polarization curves (CPPC) and Electrochemical Impedance Spectroscopy (EIS) in 3.5% NaCl. Scanning Electron Microscopy (SEM) was used to determinate morphology and thickness of coating. Results shows that aluminium anodized with sulfuric-citric acid mixture presenting less pitting corrosion resistance without present a significative difference in surface morphology.
展开▼
