Abstract
The paper presents research on evaluation of corrosion resistance of Ni-W alloy coatings subjected to heat treatment. The corrosion resistance was tested in 5% NaCl solution by the use of potentiodynamic polarization technique and electrochemical impedance spectroscopy. Characteristics of the Ni-W coatings after heat treatment were carried out using scanning electron microscopy, scanning Kelvin probe technique and X-ray diffraction. Suggested reasons for the improvement of properties of the heat treated Ni-W coating, obtained at the lowest current density value (125 mA∙cm−2), are the highest tungsten content (c.a. 25 at.%) as well as the smallest and the most homogeneous electrochemically active surface area.
Highlights
The electroplating technique is increasingly used to obtain new materials with specific functional properties
The coatings areare characterized by grey, smooth and uniform surface.surface
The morphology of the coatings differs, which means it depends on the deposition current density
Summary
The electroplating technique is increasingly used to obtain new materials with specific functional properties This is due to the fact that by controlling the deposition parameters, i.e. voltage, current, bath composition, temperature, it is possible to influence the structure of the obtained material, and its properties. Sulfamine and citrate baths with the addition of sodium tungstate are usually used [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,44]
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