Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Monika KĄDZIELA"

Electrodeposition of Zn, Cu and Cu-Zn alloy coatings from the galvanic baths based on 2-hydroxyethyl-trimethylammonium acetate DOI:10.15199/40.2019.3.9

  1. Introduction Corrosion protection of metals and alloys could be realized by electroplating. Apart electrodeposition of pure metals there is also known electroplating of alloys which is more and more often used. The matter of electrolytic deposition of alloys has been known since 1841 when a method of electrodeposition of copper alloys has been patented. Alloys electroplating has few advantages, which are not obtained by other methods of alloy formation (e.g. casting) [13]: - the process is carried out at relatively low temperature (up to dozens of °C) which does not generate the cost connected with heating for metals melting, - the influence on a structure the formed alloys by changing the parameters of process or the composition of galvanic bath, - the possibility of stable or metastable phases formation, which are impossible or very hard for obtaining in the case of metallurgical alloys, - the possibility of deposition coatings of homogeneous thickness, which is easy adjusted, - the galvanic coatings have lower porosity than casted alloys or the ones made by powder sintering technique. An appreciable part of metal could be deposited in a form of coating by electrodeposition from aqueous solutions containing ions of the metals. There are also some metals which can be cathodically deposited just in a form of alloy, but pure metal electrodeposition is not possible. It should be noticed that the electroplating from aqueous solutions has some disadvantages. One of them is hydrogen evolution on the cathode surface, where the coating is formed and a consequence of the phenomenon could be hydriding of the deposited metal. An use of toxic and hazardous compounds as components of galvanic baths (e.g. cyanides) as well as large amount of wastewater are the next drawbacks of the process. Moreover, the electrodeposition of some metals (like magnesium, aluminum, titanium) is unfeasible from aqueous solutions. Therefore the investigat[...]

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