Corrosion properties of CuAl9Mn2/ER 321 composites formed by dual-wire-feed electron beam additive manufacturing

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 3 2024 Corrosion properties of CuAl9Mn2/ER 321 composites formed by dual-wire-feed electron beam additive manufacturing Viktor Semin a, Aleksander Panfilov b, Veronika Utyaganova c, Andrey Vorontsov d, Anna Zykova e, * Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, Tomsk, 634055, Russian Federation a https://orcid.org/0000-0003-0410-3667, viktor.semin.tsk@gmail.com; b https://orcid.org/0000-0001-8648-0743, alexpl@ispms.ru; c https://orcid.org/0000-0002-2303-8015, veronika_ru@ispms.ru; d https://orcid.org/0000-0002-4334-7616, vav@ispms.ru; e https://orcid.org/0000-0001-8779-3784, zykovaap@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2024 vol. 26 no. 3 pp. 163–178 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2024-26.3-163-178 ART I CLE I NFO Article history: Received: 18 April 2024 Revised: 15 May 2024 Accepted: 01 June 2024 Available online: 15 September 2024 Keywords: Aluminum bronze Stainless steel ElectronBeamAdditiveManufacturing Composite Corrosion Funding The work was performed according to the Government research assignment for ISPMS SB RAS, project FWRW2024-0001. ABSTRACT Introduction. The development of novel materials based on copper alloys and stainless steel, as well as the determination of the optimal parameters for its processing make it possible to expand the area of its implementation, increase efficiency and service life of tools and constructions. The load-bearing parts of marine equipment (bearing constructions, piston cylinders, pumps, valves, gears, rotary instruments, etc.), made of austenitic steels or aluminum bronze, are in direct contact with sea water, so the problem of increasing its corrosion resistance in the presence of strong oxidizing agents (Cl–, F– anions) is relevant. One of the advanced and actively researched methods for producing copper/steel composites is additive manufacturing that allow fabricating complex parts through layerby-layer growth. In particular, the synthesis of composites based on aluminum bronze and steel can be realized by wire-feed electron beam additive manufacturing. In order to implement composite materials produced via additive technologies in a humid (marine) climate, it is necessary to ensure not only high strength, but also corrosion properties. The purpose of this work is to study the corrosion resistance of composites, based on aluminum bronze CuAl9Mn2 and stainless steel ER 321 produced by dual-wire-feed electron beam additive manufacturing. Research methods. Examination of the surface of CuAl9Mn2/ER 321 composites before and after corrosion tests was carried out by methods of voltammetry and electrochemical impedance spectroscopy using a potentiostat-galvanostat. Results and discussion. Using a complex of electrochemical methods, it is revealed that the developed composites with a volume fraction of steel ≥ 25 % demonstrate a significant decrease in anodic current densities and a simultaneous increase in charge transfer resistance. Composites with a steel content of 75 vol. % are characterized by the highest corrosion properties in 3.5 wt. % NaCl solution, which is referred to a reduction in corrosion rate by 9.5 times compared to aluminum bronze. It is shown that the main processes occurring on the surface of the composites (CuAl9Mn2 + + ER 321) are anodic oxidation of copper and iron, leading to the formation of corrosion products – Cu2O and FeCl2. For citation: Semin V.O., PanfilovA.O., Utyaganova V.R., VorontsovA.V., ZykovaA.P. Corrosion properties of CuAl9Mn2/ER 321 composites formed by dual-wire-feed electron beam additive manufacturing. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2024, vol. 26, no. 3, pp. 163–178. DOI: 10.17212/1994-6309-2024-26.3-163-178. (In Russian). ______ * Corresponding author Zykova Anna P., Ph.D. (Physics and Mathematics), Head Laboratory Institute of Strength Physics and Materials Sciences SB RAS, 2/4, pr. Akademicheskii, 634055, Tomsk, Russian Federation Tel.: +7 3822 286866, e-mail: zykovaap@ispms.ru Introduction It is well known that aluminum bronzes are distinguished among copper alloys by its high mechanical, corrosion and anti-friction properties [1, 2]. These alloys are widely used in the marine industry (valves, fittings, ship propellers, pump shafts, valve rods, water chambers of heat exchangers etc.) [3]. Bronze alloyed with ~10 wt. % Al, exhibits the best comprehensive properties and is considered to be the most widely used materials in the aluminum bronze group of alloys. When Al content reaches a solubility limit (9.4 wt. %), the friction coefficient decreases, but a wear loss during wear on steel increases [4, 5]. The microstructure, corrosion resistance and wear resistance of aluminum bronze alloys are complex and

RkJQdWJsaXNoZXIy MTk0ODM1