111 ISSN 2070-2051, Protection of Metals and Physical Chemistry of Surfaces, 2018, Vol. 54, No. 1, pp. 111–113. © Pleiades Publishing, Ltd., 2018. Original Russian Text © E.G. Vinokurov, K.V. Zuev, F.N. Zhigunov, V.P. Perevalov, 2018, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2018, Vol. 54, No. 00000, pp. 00000–00000. Wear Resistance of Nickel–Phosphorus–Modified Copper Phthalocyanate Composition Coatings E. G. Vinokurov a, b, *, K. V. Zuev a, c , F. N. Zhigunov a , and V. P. Perevalov a a Mendeleev University of Chemical Technology of Russia, Moscow, 125047 Russia b Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia c Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: vin-62@mail.ru Received June 6, 2017 Abstract⎯New antifriction composition coatings based on Ni-P alloy and nanodisperse particles of copper phthalocyanate (CuPc) modified with 4-benzenediazonium carboxylate have been prepared and investi- gated. The effect of the content of carboxylic groups in the disperse phase on the wear resistance of the coat- ings has been studied, and the optimal concentration of CuPc in the suspension for the autocatalytic deposi- tion of composition coatings has been determined. Keywords: antifriction coatings, composition coatings, phthalocyanines, electroless nickel plating DOI: 10.1134/S2070205118010136 INTRODUCTION Loss of energy during friction and wear is a large problem in the operation of actuated parts of most mechanisms. Various lubricating materials are employed to reduce the friction coefficient and form a protective tribologically active film between parts. It was shown in [1] that phthalocyanine (Pc) derivatives possess necessary features of triboactive additives, in particular, structure-formation ability at an interface; in this case, the shear of one layer of Pc crystallite rel- ative to others under the external load is provided due to their supramolecular layer structure. There are lit- erature data on the application of phthalocyanines as additives to plastic lubricants [2], oils [3], and lubri- cating compositions [4]. The features of Pc employed in these cases were analyzed in review [5]. An alternative to the use of conventional liquid, plastic, and solid lubricants may be represented by antifriction compositions, which are deposited on parts and friction units using chemical and electro- chemical deposition. One example is that the soluble sulfo-derivative of metal-free phthalocyanine at the content of up to 50 mg/L in nickel-plating electrolytes (Ni, Ni-Co, Ni-Fe) provides bright coatings possess- ing increased microhardness [6, 7]. In addition, the preparation of antifriction copper composition coat- ings (CCs) with the inclusion of nanoparticles of phthalocyanine metal complexes (MPc) was described in [8]. When using water-insoluble phthalocyanines for the preparation of CCs, it is a problem to maintain their suspension stability in electrolyte solutions. To solve this problem, various approaches to the modifi- cation of Pc are used; in this case, chemical methods are considered more reliable and effective. Chemically modified phthalocyanine derivatives are prepared either on the basis of substituted phthalogens [9] or using heterophase reactions of unsubstituted Pc [5]. In [10, 11], a method for the functionalization of the sur- face of MPc aggregates, which concerns the reaction with aryldiazonium salts, was described and the prop- erties of the products and their aqueous suspensions were analyzed, namely, dispersion, electrokinetic potential, and stability. In this work, the preparation of Ni-P-CuPc* composition coatings derived from cop- per phthalocyanates modified with carboxyphenyl groups (CuPc*) and their tribological properties under rubbing friction were investigated. EXPERIMENTAL Chemical deposition of Ni-P coatings and Ni-P- CuPc* composition coatings was carried out from the solution with the following contents [12] (mol/L): nickel sulfate, 0.12; sodium hypophosphite, 0.37; gly- cine, 0.13; malonic acid, 0.18; copper sulfate, 0.03; lead nitrate, 10.5; and the additive of the disperse phase (CuPc or CuPc*), up to 1 g/L, at pH 6.5 and a temperature of 80°С. The disperse phase was intro- duced during mechanical stirring and ultrasonic treat- ment of suspensions. Coatings with the thickness of 30 ± 3 μm were thermally treated in the air at 400°С for 1 h. NEW SUBSTANCES, MATERIALS AND COATINGS