The size effect of the corrosion rate of copper in the pyrophosphate electrolyte
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MYRZAK, Viorica A., DIKUSAR, Aleksandr. The size effect of the corrosion rate of copper in the pyrophosphate electrolyte. In: Physical Methods in Coordination and Supramolecular Chemistry, 8-9 octombrie 2015, Chişinău. Chisinau, Republic of Moldova: 2015, XVIII, p. 106.
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Physical Methods in Coordination and Supramolecular Chemistry
XVIII, 2015
Conferința ""Physical Methods in Coordination and Supramolecular Chemistry""
Chişinău, Moldova, 8-9 octombrie 2015

The size effect of the corrosion rate of copper in the pyrophosphate electrolyte


Pag. 106-106

Myrzak Viorica A.12, Dikusar Aleksandr 1
 
1 Institute of Applied Physics,
2 Institute of Chemistry
 
Disponibil în IBN: 21 aprilie 2020


Rezumat

The deposition of copper from the pyrophosphate electrolyte is studied over the past decades [1-3] as an effective method of copper plating, but the problems of corrosion, and especially the size effects of corrosion, works devoted not so much. This paper deals with direct measurements of size effects of the corrosion rate of copper in pyrophosphate solution. Corrosion was investigated on the samples of the electrodeposited copper (electrode disk diameter 10, 25, 50 and 500 micron) obtained from pyrophosphate electrolyte with the following composition: 12.5 g/L of CuSO4.5H20 and 100 g/L of Na4P4O7.5H20, pH = 8 at room temperature. Corrosion was studied in the same electrolyte (without the addition of a copper ion) by measuring polarization curves from - 0.8 V to + 0.1 V at a scan rate 5mV/s. The corrosion rate was calculated with Program GPES. It is obtained that for microelectrodes with radius of 5 microns corrosion rate increases by 8 times compared with microelectrodes with radius of 25 microns. While for microelectrodes with radii in the range 25-250 microns measured corrosion rate was not changed. It is obtained that the investigated corrosion process - is corrosion with oxygen depolarization (in the range of 5-25 microns radii of microelectrodes reduction rate (dissolved oxygen) increases in 8 times). The results of measurements of the observed size effects are confirmed by calculations for the diffusion currents of microelectrodes, from which it follows that the size effect (increasing density of the diffusion current with decreasing size of the electrode surface) should be observed for surfaces with a radius of less than 20-30 microns. This research was funded by the ASM projects number 11.817.05.05.A "Electrochemical methods of obtaining and processing of new materials and coatings with improved functional properties" and №15.817.02.05.A "Physical-chemical methods and engineering aspects of the production of new materials and surfaces for multi-scale technologies", and also from the European project IRSES № 295202 (Oil & Sugar).