Accession Number : ADA632502


Title :   Engineering of Nanoscale Antifouling and Hydrophobic Surfaces on Naval Structural Steel HY-80 by Anodizing


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Samaras, Thomas


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a632502.pdf


Report Date : Jun 2015


Pagination or Media Count : 113


Abstract : The impact that biofouling has on a ship's performance has long been recognized, since it increases the frictional resistance of the hull and can increase the ship's fuel consumption. In this study, the spectrum of hydrophobic and antifouling surface patterns that can electrochemically be fabricated on HY-80 steel (alloy that is broadly used in shipbuilding for welded hull plates) is examined. After the fabrication of nanoscaled topographies, the optimum conditions for anodizing are determined by correlating the processing conditions with microstructural data. Characterization of the surface oxides was conducted by techniques such as Scanning Electron and Focused Ion Beam microscopy as well as identification of the formed phases by X-ray diffraction techniques. Hydrophobicity of the surfaces was examined by measuring the contact angle of deionized water on the HY-80 steel surface. These studies revealed the improved wetting behavior of the anodized surfaces. Thermogravimetric analysis along with quantitative examination of the biofouling on the specimens were studied after prolonged exposure to seawater and indicated a decrease in the corrosion rate of anodized surfaces.


Descriptors :   *ANTIFOULING , *HYDROPHOBIC PROPERTIES , *SEA WATER CORROSION , *STRUCTURAL STEEL , CRACKING(FRACTURING) , ELECTROCHEMISTRY , ELECTRONIC SCANNERS , FAILURE(MECHANICS) , FRICTION , MARINE ENGINEERING , MICROORGANISMS , NANOSTRUCTURES , OPTIMIZATION , SHIP HULLS , THERMOGRAVIMETRIC ANALYSIS , THESES , X RAY DIFFRACTION


Subject Categories : Physical Chemistry
      Properties of Metals and Alloys
      Marine Engineering
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE