English

Vol. 8 4, 2018 p 437-443

Pages

Article name, authors, abstract and keyword

437-443

Modification of properties of aluminum protective anodes by nanopowder materials

Ivan T. Panov a, Valentin K. Manolov b, Anatoly N. Cherepanov c

a Technical University of Sofia, Branch Plovdiv, 25 Tsanko Dyustabanov Str., Plovdiv, 4000, Bulgaria
b Institute of Metal Science, Equipment and Technologies Acad. A. Balevski with Centre for Hydro- and Aerodynamics, Bulgarian Academy of Sciences, 67 Shipchensky Prohod Str., 1574 Sofia, Bulgaria
c Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of Russian Academy of Sciences, 4/1 Institutskaya Str., Novosibirsk, 630090, Russian Federation

DOI: 10.28999/2541-9595-2018-8-4-437-443

Abstract: Experimental studies of the effect of specially prepared nanoscale refractory powders on the structure and electrochemical characteristics of an aluminum alloy used for the production of protective anodes are carried out. The investigations were performed with an AlZn4 aluminum alloy of the Al-Zn system using antipassivating additives Cd, In. Nanopowders of aluminum nitride (AlN) and nanodiamond (ND) were used as nanomodifiers (NM). To increase the wettability, the powders were clad with metals: AlN powder was clad with aluminum in a planetary mill in a ratio of 1:3 and further dispersed by ultrasound the dosage was 0.05 % by weight based on AlN. The ND powder was clad in silver in a ratio of 1:0.1 by means of an electrochemical coating the dosage was 0.1 % by mass based on ND. Measurements of the electrochemical potential during the anodic polarization of the samples were carried out in various electrolytes: marine, drinking and distilled water in the temperature range from 20 to 90 C. It has been found that modifying the AlZn4 alloy with nanopowders of aluminum and diamond nitride leads to a reduction in the structure of the alloy by a factor of 1.5 to 2, an increase in the electronegative potential of the metal, the strength of the working anode, and a decrease in the gas-shrinkage porosity. In the protectors obtained by casting, microcracks are often found. The use of nanomodifying additives leads to the disappearance of microcracks The results obtained are of practical practical importance for increasing the efficiency of corrosion protection of main pipelines, metal underground tanks, storage tanks for cold and hot water.

Keywords: tread anode, corrosion, negative potential, electrochemical protection, nanomodification, nanopowders.

Acknowledgements
The studies were carried out with the support of the Bulgarian National Science Fund under the contract No. DN 07/20/15.12.2016.

For citation:
Panov I. T., Manolov V. K., Cherepanov A. N. Modification of properties of aluminum protective anodes by nanopowder materials. Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktovScience & Technologies: Oil and Oil Products Pipeline Transportation. 2018;8(4):437443. DOI: 10.28999/2541-9595-2018-8-4-437-443.

References:
[1] Mentugov I. V. Electrochemical protection of main pipelines against corrosion. Moscow: GANG Publ.; 1996. (In Russ.)
[2] Dizenko E. I, Novoselov V. F, Tugunov P. I, Yufin V. A Corrosion protection of pipelines and tanks. Moscow: Nedra Publ.; 1978. (In Russ.)
[3] Lublinsky E. Y. Electrochemical corrosion protection. Moscow: Metallurgy Publ.; 1987. 96 p. (In Russ.)
[4] Lublinsky E. Y., Bibikov N. N. Aluminum casting tread alloys. Proceedings of All-Union Aluminium and Magnesium Institute. 1968. Vol. 62. . 6168. (In Russ.)
[5] Krasnoyarsky V. V. Electrochemical method of metal protection from corrosion, Moscow: Mashgiz Publ.; 1961. 88 p. (In Russ.)
[6] Kuzub V. S. Anode protection of process equipment. Moscow: Metallurgy Publ.; 1989. 96 p. (In Russ.)
[7] Kovachev V., Panov I. The development of casting technique of aluminium protectors, aimed at the corrosion protection of enameled water-heating boilers. Proceedings of Scientific and technical union of mechanical engineering. 1998;6(17): 107114. (In Bulg.)
[8] Zhukov M. F., Chersky I. N., Cherepanov A. N., et al. Strengthening of metallic polymeric and elastomeric materials with ultra-dispersible powders. Novosibirsk: Nauka Publ.; 1999. 312 p. (In Russ.)
[9] Moskvichev V. V., Krushenko G. G., Burov A. E., et al. Nanopowder technologies in mechanical engineering. Krasnoyarsk: Siberian Federal University Publ.; 2013. 186 p. (In Russ.)
[10] Cherepanov A. N., Ovcharenko V. E., Liu G., Cao L. Modifying structure and properties of nickel alloys by nanostructured composite powders. Thermophysics and Aeromechanics. 2015;22(1):127132. DOI: 10.1134 / S0869864314010114. (In Russ.)
[11] Kuzmanov P., Dimitrova R., Lazarova R., Cherepanov A., Popov S., Petrov R., Manolov V. Investigation of the structure and mechanical properties of castings of alloy AlSi7Mg, cast irons GG15 and GG25 and steel GX120Mn12, modified by nanosized powders. Proc. Inst. Mech. Eng., Part N: J. Nanoeng. Nanosyst. 2014;228(1):1118.
[12] Lazarova R., Manolov V., Manchev M., Cherepanov A. Investigation of the influence of nanomodifiers on the microstructure and mechanical properties of P265GH. Journal of Materials Science and Technology. 2010;18(2):120128. (In Russ.)
[13] Choi H., Konishi H., Li X. Al2O3 nanoparticles induced simultaneous refinement and modification of primary and eutectic Si particles in hypereutectic Al20Si alloy. Materials Science and Engineering A. 2012;541:159165.
[14] Dimitrova R., Kuzmanov P., Lazarova R., Manolov V. Investigation of nanopowders application in metal casting. Advanced Materials Research. 2013;629:284291. DOI: org/10.4028/www.scientific.net/AMR.629.284.
[15] Lazarova R., Kuzmanov P., Dimitrova R., Cherepanov A., Manolov V. Properties of 110G13L Steel and SCH 25 grey cast iron, modified by nanopowders of refractory compounds. Izvestiya Vysshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy. 2012;55(4):1720. DOI: 10.17073/0368-0797-2012-4-17-20. (In Russ.)
[16] Kovachev V., Panov I. Investigation of the possibility of increasing the electrochemical characteristics of aluminum protectors. Proceedings of Scientific and technical union of mechanical engineering. 1998;6(17):85106. (In Bulg.)
[17] Kovatchev V., Panov I. Investigation of the structure of aluminum alloys designed for cathodic corrosion protection of enameled water-heating boilers. Jubilee International Scientific Conference of Highest Technical School Angel Kanchev: collection of works. Vol. 49. Series 2. P. 1318. Ruse (Bulgaria), 2010. (In Bulg.)