THE INFLUENCE OF VARIOUS MODES OF NONSTATIONARY ELECTROLYSIS ON THE FORMATION
RATE OF GALVANIC METAL AND ALLOY COATINGS, THEIR COMPOSITION AND PROPERTIES 

Kireev Sergey Yur'evich, Doctor of engineering sciences, associate professor, sub-department of chemistry, dean of the Faculty of Mechanical Engineering and Transport, Penza State University (40 Krasnaya street, Penza, Russia), Sergey58_79@mail.ru
Yangurazova Al'fiya Zyakyar'yaevna, Postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), alfiya570@mail.ru
Kireeva Svetlana Nikolaevna, Candidate of engineering sciences, associate professor, sub-department of chemistry, Penza State University (40 Krasnaya street, Penza, Russia), svetlana58_75@mail.ru

66.087

10.21685/2307-9150-2017-4-7

Background. The research object is the process of metal and alloy electrodeposition using various modes of nonstationary electrolysis with AC. The research subject is the dependence of coatings’ formation rate, composition, quality and properties on various modes of nonstationary electrolysis. The work is aimed at studying the influence of various modes of nonstationary electrolysis on the formation rate of galvanic metal and alloy coatings, their composition and properties.
Materials and methods. The set tasks were solved by the following methods: coulometry, potentiomentry, gravimetry, titrimetry, spectrophotometry, methods of researching physical, chemical and mechanical properties and their corrosion resistance.
Results. The article presents the results of experimental research of electrodeposition of cadmium, indium, tin, zinc, nickel and alloys of cadmium-tin and indiumcadmium from acid electrolyte with added latic and tartaric acids applying various modes of nonstationary electrolysis. The authors have established dependencies of the process rate, coating’s properties, quality and composition on modes of nonstationary electrolysis, as well as on a type of poling main electrode.
Conclusions. 1. AC modes of electrolysis with controlled amperage in an impulse have an insignificant impact on the rate of electrodeposition of metals and alloys. The said mode exerts a greater impact on morphological fatures of the coatings, as well as on their properties. The said electrolysis modes promote formation of coatings with metals of uneven composition thickness. 2. The mode of impulse electrolysis with controlled impulse potential significantly intensifies metal electrodeposition and has a greater influence on the coating morphology and its properties than the modes with controlled amperage in an impulse. 3. The main cause of improved physical and chemical properties of the coatings is formation of a finercrystalline structure of coatings with a lesser impurity content.

mode of nonstationary electrolysis, electrodeposition of coatings, process rate, coating’s properties

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