Development of functional super water-repellent stainless steel surface technology for improving corrosion resistance

Abstract

The present invention relates to a technology for developing a functional super water-repellent stainless steel surface for improving corrosion resistance, and the method for forming a corrosion resistant oxide film on a stainless steel surface according to the present invention can form a uniform porous oxide film even without a conventional pre-patterning process for forming a uniform porous oxide film, and further has effects of remarkably excellent super-hydrophobicity and corrosion resistance even without a pore expansion step after conventional anodization treatment, and thus manufacturing costs can be reduced.

What is claimed is: 
     
         1 . A method for forming a corrosion resistant oxide film on a stainless steel surface, the method comprising:
 washing and drying the stainless steel surface (step 1);   performing anodization treatment at an applied voltage of 65 to 75 V for 2.5 to 3.5 hours to form an anodized film on the stainless steel surface (step 2);   performing plasma treatment to remove organic residues and make the surface of the anodized film hydrophilic (step 3); and   coating it with a hydrophobic coating agent capable of performing self-assembled monolayer (SAM) coating (Step 4).   
     
     
         2 . The method of  claim 1 , wherein stainless steel is SUS 304 or SUS 304L. 
     
     
         3 . The method of  claim 1 , wherein the anodization treatment electrolyte in the step 2 is a mixture of NH 4 F, water, and ethylene glycol. 
     
     
         4 . The method of  claim 1 , wherein the anodization treatment in the step 2 is performed for 2.8 to 3.2 hours at an applied voltage of 68 to 72 V. 
     
     
         5 . The method of  claim 4 , wherein the anodization treatment in the step 2 is performed for 2.9 to 3.1 hours at an applied voltage of 69 to 71 V. 
     
     
         6 . The method of  claim 1 , wherein the hydrophobic coating agent capable of performing SAM coating is any one of 1H,1H,2H,2H-perfluorodecyltrichlorosilane (FDTS), trichlorooctylsilane (OTS), and octadecyltrichlorosilane (ODTS). 
     
     
         7 . The method of  claim 1 , wherein the anodized film with a contact angle of 1600 or more is formed on the stainless steel surface. 
     
     
         8 . The method of  claim 1 , wherein the anodized film with corrosion inhibition efficiency of 90% or more is formed on the stainless steel surface. 
     
     
         9 . Stainless steel on which a superhydrophobic anodized film manufactured by the method of  claim 1  is formed. 
     
     
         10 . Stainless steel on which a corrosion resistant anodized film manufactured by the method of  claim 1  is formed. 
     
     
         11 . A medical device comprising stainless steel manufactured by the method of  claim 1 . 
     
     
         12 . A maritime transportation means comprising stainless steel manufactured by the method of  claim 1 . 
     
     
         13 . A ground transportation means comprising stainless steel manufactured by the method of  claim 1 . 
     
     
         14 . An air transportation means comprising stainless steel manufactured by the method of  claim 1 .