Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia
M. V. Chukin, Dr. Eng., Chief Researcher at the Research Institute of Nanosteels, e-mail: m.chukin@mail.ru
O. A. Kupriyanova, Cand. Eng., Associate Prof., Dept. of Materials Processing Technologies, e-mail: o.nikitenko@magtu.ru
A. P. Ponomarev, Senior Lecturer, Dept. of Chemistry, e-mail: antonpon@mail.ru
D. A. Gorlenko, Cand. Eng., Associate Prof., Dept. of Foundry Processes and Materials Science, e-mail: gorldima@yandex.ru

Protection of steel products and constructions from corrosion destruction is currently becoming particularly important. The use of zinc-containing coatings is the most reasonable and practical method of protection. An important step in ensuring long-term operation of a zinc-coated metal product or construction is the choice of the method used to produce such protective coating. In practice, it is possible to form zinc-containing coatings that vary in thickness, properties, structure, phase composition and other characteristics. An irrational choice of method of protective zinc coating forming for products and constructions operating in particular conditions can lead to additional service and financial costs. The paper provides information on the most promising methods of producing zinc coatings on steel products. A comparative analysis of the thickness, structural and phase states, as well as the main operational properties (microhardness, corrosion resistance, adhesion strength of coating to substrate) of protective zinc coatings formed by various ways is carried out. It has been established that to ensure a high level of adhesion and anticorrosion ability, the interaction between the metals of substrate and coating with the formation of iron-zinc phases is important. The absence of these phases leads to a decrease in operational characteristics of coating. Moreover, the influence of aluminum microadditives to zinc on the structure and phase state of the coating, as well as on the growth of iron-zinc layers during thermodiffusion zinc coattng of cold-rolled steel is studied. It has been determined that aluminum prevents the formation of iron-zinc phases, but helps to produce more uniform zinc coating.

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