Method for forming simultaneously superhydrophobic and superoleophobic surface on 6000-series aluminum alloy omitting pre-patterning step in anodization process

A manufacturing method of an oleophobic and hydrophobic film on a 6000 series aluminum alloy, comprising:

• a step of performing primary anodic oxidation on a 6000 series aluminum alloy for 1 to 10 minutes at 35 to 45 V (step 1);
• a step of performing pore expansion (pore widening) by immersing the alloy in 0.05 to 1.0 M phosphoric acid (H3PO4) solution for 10 to 60 minutes (Step 2);
• and
• a step of performing secondary anodic oxidation for 1 to 10 minutes at 35 to 45 V (step 3);
• and
• a step of coating with a coating composition including a cross-linked polydimethylsiloxane (PDMS) derivative represented by Chemical Formula 1 and an organic solvent (step 4),
• wherein prior to step 1, a pre-patterning process is omitted.
• (In Chemical Formula 1, x and y are each an integer of 1 to 30).