A new method for preparing bionic multi scale superhydrophobic functional surface on X70 pipeline steel

The hydrophobic property of a rough surface with a low free energy coating was theoretically analyzed in this paper. In order to obtain a superhydrophobic surface, a rough surface morphology must be formed in addition to the low free energy coating on the surface. Through the shot blasting, chemical etching with concentrated hydrochloric acid, and low free energy modification with myristic acid ethanol solution, the superhydrophobic surface was obtained on X70 pipeline steel. The better process parameters for preparing superhydrophobic surface on X70 pipeline steel were obtained. The diameter of the stainless steel shot used in the shot blasting was 0.8-1.0 mm. The concentration of hydrochloric acid was 6 mol/L. The chemical etching time was 320 min. The concentration of myristic acid ethanol solution was 0.1 mol/L. The soaking time in myristic acid ethanol solution was 72 h. After X70 pipeline steel surface was treated using the process parameters mentioned above, the biggest contact angle between the specimen surface and distilled water was 153.5 degrees, and the sliding angle was less than 5 degrees. (C) 2013 Elsevier B.V. All rights reserved.