Formation of porous hydrophobic stainless steel surfaces by maskless electrochemical machining

Abstract

Surface topography is an important feature, which directly affects the friction, corrosion and flow characteristics of a workpiece. In this study, a new approach was explored to produce a microporous structure by maskless electrochemical machining (ECM). A rough surface with a microporous structure was created on a stainless steel substrate, and the principle of the micropore formation was investigated. It was found that the microporosity could form, grow and interconnect when the potential of the anodic surface was higher than the pitting potential of the material. The electric field is an important factor, and the surface topography can be altered by changing the electrical parameters. The porous microstructure was observed by laser scanning confocal microscopy. The rough and porous surface, modified with 1-dodecanethiol, exhibits hydrophobic characteristics, with a static contact angle of 1378 for water droplets. This is a significant improvement in the wetting properties for stainless steels.

Electrodeposition and properties of Ni–B/SiC nanocomposite coatings

“…It can indicate that the nickel oxidant in the bath can be reduced to metallic nickel during the electroplating process. The binding energy values measured in the XPS spectra were in good agreement with values reported by other researchers [37,38]. As can be seen in Figure 10(b), the B 1s of the as-deposited coating can be divided into three chemical states of the boron species, the peak at 191.6 eV corresponding to elemental boron.…”

Anti-fingerprint properties of engineering surfaces: a review

“…To improve the surface repellency towards a large variety of liquids, especially with low surface tension, the chemical composition of the surface must be modified using chemical groups with low surface energy. Numerous researchers have successfully prepared anti-wetting and super-repellent surfaces on metal [5,[39][40][41][42], glass [10,40,43,44] and polymer [45][46][47][48] substrates by lowering the surface free energy. Different methods have been used to arrive at this achievement, such as dip coating and solution immersion methods [41,49,50], vapour deposition [3,51,52], spray coating [40,43,[53][54][55], electrochemical deposition [56,57], spin coating [39,[58][59][60] and layer-by-layer method [61][62][63].…”

A study of laser cladding NiCrBSi/Mo composite coatings

“…42CrMo steel is a kind of high strength steel. It is widely used to manufacture the roll substrate [25][26][27]. With the rapid development of economy in China, the demand for steel is increasing.…”