Abstract
The main objective of the present work is to fabricate continuous regime of surface micro-texturing on flat surfaces of a dual phase steel (DPS) and a commercial pure Cu by laser micro-texturing only on the araldite mask laid on the specimen followed by electrochemical dissolution. The sharp and blunt conical grids with average base width (maximum distance between two consecutive micro-channels) of 174 and 214.3 μm as well as 42.2 and 54.3 μm of average depth of dissolution were achieved using two steps electrochemical dissolution process in the DPS and Cu specimens, respectively. Solution used for electrochemical dissolution of the DPS was freely aerated 3.5 wt% NaCl, whereas, etchant for Cu consisted of nitric acid, acetic acid and sulfuric acid with deionized water. Different aspects of creating micro-texturing, like masked coating thickness, micro-channel dimension, depth of dissolution and grid patterns were discussed. No change in hardness of the surface as well as absence of cracks before and after micro-texturing suggested negligible variation in the microstructure due to processing. In addition, the two-step preparation of micro-textured surfaces showed considerable hydrophobicity in addition to the considerable increase in surface area.
Published Version
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