Abstract
Sulfuric acid anodizing (SAA) is a common corrosion protection method for aluminum alloys. Selected additives, usually organic compounds, can be added to the sulfuric acid (SA) electrolyte to improve the corrosion resistance of the anodized layer. It is a widespread opinion that certain organic compounds minimize the dissolution rate of an alloy in the SA electrolyte, thereby improving the structure, morphology, and consequently, the corrosion resistance of the resulting porous film. This work introduces Methionine-Sulfuric Acid (MSA) anodizing as a green and energy-efficient method for developing corrosion-resistant anodic oxide films on AA 2024-T3. Electrochemical investigations at free-corrosion potential revealed that methionine retards the alloy dissolution rate in SA with an inhibition efficiency of above 90%. During anodizing, MSA electrolytes decreased the current density, leading to a decrease in energy consumption of up to 52% compared to the SA counterpart. The Field Emission—Scanning Electron Microscopy (FE-SEM) showed that MSA films have lower thickness and improved pore morphology than SA film generated at the same experimental conditions. The corrosion analyses via salt spray and immersion tests complemented by electrochemical and surface studies indicate superior corrosion performances for MSA films before and after hydrothermal sealing.
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