Improving Corrosion Performance By
Surface Patterning
Author(s)
M. Bigdeli Karimi, V. Stoilov & D. O. Northwood
Abstract
Based on the idea that hydrophobic (low or non-wettable) surfaces can decrease
the contact area between a corrosive solution and a surface, thereby potentially
rendering the material more corrosion resistant, the effect of surface patterning
on the corrosion behaviour of nickel was investigated. The surface patterning
consisted of an array of holes of various diameters (D) and inter-hole spacings
(L) that were produced by a laser ablation process. The corrosion behaviour of
the patterned surfaces was studied using a potentiodynamic polarization method
in a 0.5M H2SO4 electrolyte and compared with that of a polished reference
sample. Following the potentiodynamic polarization corrosion test cycle, the
corroded surfaces were examined using scanning electron microscopy (SEM) for
morphological features and white light interferometry (WLI) to determine the
surface roughness. The changes in surface morphology were related to the
corrosion behaviour. A relationship was found between D, L, and the corrosion
current density (Icorr), whereby the higher the (D/L )2 ratio, the higher the Icorr
value. The corrosion potential (Ecorr) of all surface patterned samples was lower
(less noble) than that of the reference sample in all tests.
Keywords: corrosion resistance, surface patterning, hydrophobicity, laser
ablation.
1 Introduction
Wettability of solid surfaces is an important property and depends both on the
surface chemistry and on the surface topology. Recently, hydrophobic and
superhydrophobic surfaces (water contact angles larger than 150°) have received
a lot of attention, due to their important applications ranging from self-cleaning
Keywords
corrosion resistance, surface patterning, hydrophobicity, laser
ablation
Related Book
Other papers in this volume
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