5. Summarizing the observations

Ternary Co▬Mo▬W electrolytic alloys deposited from citrate-pyrophosphate bath at pulse current composition and surface morphology were shown to be dependent on the current density and on/off time. The top refractory metal content in deposits was obtained at the current density of 9–10 A dm<sup>2</sup> and on/off time of 5/20 ms, but increasing current density diminishes efficiency of electrolysis. Tungsten content in the alloy was found to be much lower than molybdenum: W—2–7 at. % vs

Mo—16–22 at. % when depositing Co▬Mo▬W from the electrolyte with the oxometalate ratio Mo:W as 1:2. Structure of the ternary alloys was found to be amorphous-crystalline, and coherent-scattering region size was detected of 2–8 nm. Ternary coatings contain intermetallic phases Co7W6 and Co7Mo3. The amorphous structure of ternary alloys and significant content of alloying elements (Mo and W) provide high corrosion resistance increasing with total content of refractory metals.

References

pp. 209-210

1011355325698

materials

107

[1] Alexandrov Y, Pospelow A, Ved' M, et al. New application of electrode impedance spectroscopy in electrosynthesis of the organic conductors. In: Abstracts of NATO ARW "Recent Advances towards New Technologies"; 14-18 September 2003; Sudak, Crimea, Ukraine. 2003. p. 52

DOI: http://dx.doi.org/10.5772/intechopen.84519

Composition Electrolytic Coatings with Given Functional Properties

2014;87:276-282. DOI: 10.1134/

[8] Yao S, Zhao S, Guo H, Kowaka M. A new amorphous alloy deposit with high corrosion resistance. Corrosion. 1996; 52(3):183-186. DOI: 10.5006/1.3292112

[9] Tsyntsaru N, Cesiulis H, Donten M, Sort J, Pellicer E, Podlaha-Murphy EJ. Modern trends in tungsten alloys electrodeposition with iron group metals. Surface Engineering and Applied Electrochemistry. 2012;48:

[10] Kohli S, Miglani S, Rapariya R. Basics of artificial neural network. International Journal of Computer Science and Mobile Computing. 2014;3:

[11] Ved' MV, Sakhnenko MD, Shtefan VV, et al. Computer modeling of the nonchromate treatment of aluminum alloys by neural networks. Materials

Ermolenko IY, Hapon YK, Kozyar MO. Design, synthesis, and diagnostics of functional galvanic coatings made of multicomponent alloys. Materials Science. 2017;53:680-686. DOI: 10.1007/

topography of galvanic coatings Fe-Co-W and Fe-Co-Mo. Nanoscale Research Letters. 2017;12:352. DOI: 10.1186/

Science. 2008;44(2):216-221

[12] Sakhnenko MD, Ved' MV,

[13] Yermolenko IY, Ved' MV, Sakhnenko ND, Sachanova YI. Composition, morphology, and

[14] Karakurkchi AV, Ved' MV, Yermolenko IY, Sakhnenko ND. Electrochemical deposition of Fe–Mo–

W alloy coatings from citrate electrolyte. Surface Engineering and

s11003-017-0009-7

s11671-017-2128-3

S1070427214030057

491-520. DOI: 10.3103/ S1068375512060038

745-751

[2] Alexandrov Y, Sakhnenko N, Pospelow A, et al. Ion-selective

electrodes based on organic conductors. In: Abstracts of the 5-th Int. Conf. "Electronic Processes in Organic Materials" (ICEPOM-5); 24-29 May 2004; Kyiv: Naukoviy Svit. 2004.

[3] Sakhnenko MD, Ved' MV, Bairachna TM. Electrolytic alloys: Origin of synergetic effects. In: Materials of Conference Applied physico-inorganic chemistry; Simferopol: DIP. 2013. p. 53

[4] Yar-Mukhamedova GS. Influence of

[5] Ved' M, Sakhnenko N, Bairachnaya

thermal treatment on corrosion resistance of chromium and nickel composite coatings. Materials Science. 2000;36:922-924. DOI: 10.1023/A:

T, Tkachenko N. Structure and properties of electrolytic cobalttungsten alloy coatings. Functional

[6] Ahmad J, Asami K, Takeuchi A, Louzguine DV, Inoue A. High strength Ni-Fe-W and Ni-Fe-W-P alloys produced by electrodeposition. Materials Transactions. 2003;44(10): 1942-1947. Special issue on nano-hetero

structures in advanced metallic

[7] Ved' MV, Sakhnenko ND, Karakurkchi AV, Zyubanova SI. Electrodeposition of iron-molybdenum coatings from citrate electrolyte. Russian Journal of Applied Chemistry.

Materials. 2008;15:613-617

Ternary galvanic alloys Co▬Mo▬Zr of different compositions and morphologies are deposited from citrate-pyrophosphate electrolyte at pulse current. Coatings with micro-globular morphology possessing low level of stress and cracks are formed at the current density of 4–6 A dm<sup>2</sup> and on/off time 2/10 ms. Structure of Co▬Mo▬Zr alloys was found to be amorphous crystalline, and coherent-scattering region size was detected of 2–6 nm. Ternary coatings contain intermetallic phases Co3Mo and Co7Mo6. Co▬Mo▬Zr coatings high corrosion resistance is due to the molybdenum and zirconium tend to passivity, as well as the acid nature of their oxides.

The designed coating application areas corresponding to the functional properties are presented.
