Adhesion strength of nickel and zinc coatings with copper base electroplated in conditions of external stimulation by laser irradiance

V. V. Dudkina

Abstract


Purpose. The investigation of laser irradiance influence on the adhesion strength of nickel and zinc coatings with copper base and the research of initial stages of crystallization for nickel and zinc films. Methodology. Electrodeposition of nickel and zinc films from the standard sulphate electrolyte solutions was carried out on the laser-electrolytic installations, built on the basis of gas discharge CO2-laser and solid ruby laser KVANT-12. The adhesion strength of metal coatings with copper base are defined not only qualitatively using the method of meshing and by means of multiple bending, but also quantitatively by means of indention of diamond pyramid into the border line between coating and base of the side section. Spectrum microanalysis of the element composition of the border line “film and base” is carried out using the electronic microscope REMMA-102-02. Findings. Laser irradiance application of the cathode region in the process of electroplating of metal coatings enables the adhesion strength improvement of coating with the base. Experimental results of adhesive strength of the films and the spectrum analysis of the element composition for the border line between film and base showed that during laser-assisted electroplating the diffusion interaction between coating elements and the base metal surface takes place. As a result of this interaction the coating metal diffuses into the base metal, forming transition diffused layer, which enhances the improvement of adhesion strength of the coatings with the base. Originality. It is found out that ion energy increase in the double electric layer during interaction with laser irradiance affects cathode supersaturation at the stage of crystallization. Hence, it also affects the penetration depth of electroplated material ions into the base metal, which leads to the adhesion strength enhancement. Practical value. On the basis of research results obtained during the laser-assisted electroplating of the structure and mechanical characteristics of nickel and zinc metal films, their connection with the laser irradiance parameters is found out. Laser irradiance application, depending on the electroplating mode (galvanostatic or potentiostatic) allows obtaining the equilibrium structure or, on the other hand, nonequilibrium structure. 


Keywords


laser assisted electroplating; adhesion strength; solid solution; electron microprobe analysis; ion energy

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DOI: https://doi.org/10.15802/stp2013/12245

 

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doi: 10.15802/stp2015/49287



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