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Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Phosphate Coatings Enriched with Copper on Titanium Substrate Fabricated Via DC-PEO Process.

Krzysztof Rokosz¹, Tadeusz Hryniewicz¹, Wojciech Kacalak¹

¹Department of Engineering and Informatics Systems, Faculty of Mechanical Engineering, Koszalin University of Technology, 75620 Koszalin, Poland.

Materials (Basel, Switzerland)

|March 19, 2020

Summary

This study demonstrates fabricating copper-enriched porous coatings on titanium using Direct Current Plasma Electrolytic Oxidation (DC-PEO). The process allows for controlled porosity and copper incorporation, yielding advanced material properties.

Keywords:

copper(II) nitrate(V) trihydrate micro arc oxidation (MAO)orthophosphoric acid plasma electrolytic oxidation (PEO)titanium

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Area of Science:

Materials Science
Surface Engineering
Electrochemistry

Background:

Titanium substrates are widely used in biomedical and industrial applications.
Developing advanced porous coatings with specific functionalities, like copper enrichment, is crucial for enhancing material performance.
Direct Current Plasma Electrolytic Oxidation (DC-PEO) offers a versatile method for surface modification.

Purpose of the Study:

To investigate the fabrication of advanced porous coatings enriched in copper on a titanium substrate.
To explore the influence of electrolyte composition and voltage on coating properties.
To characterize the structure, composition, and porosity of the obtained coatings.

Main Methods:

Direct Current Plasma Electrolytic Oxidation (DC-PEO) with voltage control.
Electrolytes based on concentrated orthophosphoric acid with copper(II) nitrate(V) trihydrate.
Characterization techniques including X-Ray Photoelectron Spectroscopy (XPS), X-Ray Diffraction (XRD), and Energy-Dispersive X-Ray Spectroscopy (EDS), Glow-Discharge Optical Emission Spectroscopy (GDOES).

Main Results:

Variable porosity coatings were fabricated, quantifiable by the 3D parameter Sz (9.72–45.18 μm).
Copper in both Cu⁺ and Cu²⁺ oxidation states was incorporated into the coatings (0.24–2.59 at%).
The Cu/P ratio increased with higher voltage and salt concentration, and a three-layer structure was identified.

Conclusions:

DC-PEO is effective for creating copper-enriched porous coatings on titanium.
Electrolyte composition and voltage significantly influence coating porosity, copper content, and structure.
The fabricated coatings exhibit a multi-layered structure with potential for tailored applications.