Nickel-based composite electrochemical coatings (CEC) modified with multilayer graphene oxide (GO) were obtained from a sulfate-chloride electrolyte in the reverse electrolysis mode. The microstructure of these CECs was investigated by X-ray phase analysis and scanning electron microscopy. The corrosion-electrochemical behavior of nickel–GO composite coatings in a 0.5 M solution of H2SO4was studied. Tests in a 3.5% NaCl solution showed that the inclusion of GO particles into the composition of electrolytic nickel deposits makes their corrosion rate 1.40–1.50 times less.

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In the context of the theory of entrepreneurial ecosystems (EE), a set of administrative and legal measures that stimulate the development of entrepreneurship in agriculture have been identified and analyzed. These elements of EE are poorly studied in science, at the same time, administrative and legal measures to stimulate entrepreneurship in agriculture are positioned from the point of view of the development of the institution of state regulation in agriculture and can have a significant impact on all structural elements of EE. The authors have identified three models of state regulation of entrepreneurship in agriculture, one of which is the model of state stimulation of entrepreneurship in agriculture. State and non-state measures to stimulate entrepreneurship in agriculture are highlighted, the forms and levels of regulation are indicated in state regulation. The quantitative and qualitative growth of rural entrepreneurship subjects, the introduction of innovations, the formation of entrepreneurial values, the potential for solving modern problems of agricultural entrepreneurship are highlighted as the goals of state stimulation of entrepreneurship in agriculture. It is concluded that it is possible to single out an agricultural entrepreneurial ecosystem (AEE).

Influence of calcium compounds in the structure of copper matrix preliminary modified with transition metals on the cyclization of CuCa, CuBiCa, CuPbBiCa electrodes in nitric aprotic solution of calcium salt was studied. The composition of forming calcium compounds in the copper structure and electrochemical copper-based alloys was found by X-ray analysis.