Abstract
The anodizing in etidronic acid (HEDP) and oxalic acid (H2C2O4) mixed electrolytes was conducted. The anodizing parameters were optimized based on the evaluation of energy consumption, growth efficiency, and hardness of PAA film. The results indicate that continuous and uniform PAA films can be fabricated in HEDP/H2C2O4 solutions in any proportion, and both the anodizing voltages and roughnesses of PAA films decreased with the H2C2O4 content. The moderate amount of H2C2O4 could lead to an increase in the formation efficiency of PAA films. The hardness of the PAA film prepared in HEDP/H2C2O4 electrolyte could reach up to ∼660 HV. Moreover, a surface resembling lotus leaves could be formed due to the corrosion of PAA films with sub-micron interpore distance by H2C2O4 during anodizing, and a superhydrophobic surface with a contact angle of ∼153° could be obtained after it was modified via stearic acid.
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