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Applications of SLM 3D-printed pure titanium (TA2) for corrosion-resistant precision components and comparisons with Ti6Al4V, tantalum, C103, and molybdenum
3D-printed pure titanium (TA2) is a specialized additive manufacturing material characterized by high corrosion resistance, high ductility, biocompatibility, and excellent cryogenic toughness. It is widely used in precision anti-corrosion components for the chemical industry, cryogenic aerospace piping, lightweight corrosion-resistant brackets, and medical support structures. Compared to titanium alloys, pure titanium offers lower residual stress during printing, a reduced tendency to crack, superior ductility, and better uniformity in corrosion resistance. Compared to common metals such as steel, aluminum, and copper, pure titanium is lightweight, rust-proof, cryogenic-resistant, and non-toxic. Compared to rare refractory metals like tantalum, molybdenum, and C103 niobium, pure titanium benefits from a highly mature printing process, lower costs, and greater structural toughness, making it an irreplaceable primary material for 3D printing applications requiring high corrosion resistance, high toughness, and low residual stress.
Standard industrial metal 3D printing materials are unsuitable for highly corrosive or cryogenic operating conditions. 3D-printed stainless steel parts are prone to pitting and intergranular corrosion, resulting in a very short service life in chloride-rich environments; aluminum alloys exhibit poor corrosion resistance and are susceptible to oxidation and spalling; copper alloys are prone to corrosion and sulfidation; and carbon steel fails due to direct rusting. In contrast, pure titanium exhibits virtually zero corrosion in seawater, salt spray, organic acids, and cold, humid environments, outperforming all conventional pure metals across the board.
Particular emphasis is placed on comparative analyses involving Ti6Al4V and rare metal systems such as tantalum, molybdenum, and C103 niobium alloy. While Ti6Al4V offers higher strength and load-bearing capabilities, its corrosion resistance is slightly inferior to that of commercially pure (CP) titanium; furthermore, it is susceptible to the selective corrosion of minor alloying elements during long-term exposure to corrosive environments. Tantalum boasts world-class corrosion resistance—far surpassing that of CP titanium—but its prohibitive cost, printing difficulty, and tendency for component deformation make large-scale engineering applications unfeasible. Molybdenum exhibits excellent high-temperature resistance but falls far short of CP titanium in terms of corrosion resistance; it is also highly brittle and prone to cracking during the printing process. C103 niobium alloy offers outstanding high-temperature performance, yet its corrosion stability and passivation film density are inferior to those of CP titanium, compounded by raw material scarcity and high costs. Consequently, for applications requiring resistance to severe corrosion at ambient temperatures, high toughness at cryogenic temperatures, and long service life, 3D-printed CP titanium offers a superior overall cost-performance ratio compared to all rare refractory metals.
The unique advantages of 3D-printed CP titanium include extremely low residual stress, high ductility, freedom from embrittlement, and uniform corrosion resistance. CP titanium components formed via SLM (Selective Laser Melting) achieve high density and feature a stable surface passivation film, ensuring long-term stability in environments such as seawater, wet chlorine, salt spray, and cryogenic conditions; unlike molybdenum, tungsten, or C103, they do not suffer from stress corrosion cracking, oxidative spalling, or brittle fracture. Additionally, CP titanium offers high manufacturing success rates, simple post-processing, and superior dimensional stability compared to rare metals like tantalum and niobium.
Currently, 3D-printed CP titanium is widely used in anti-corrosion brackets for marine equipment, cryogenic airborne piping, miniature anti-corrosive valves for the chemical industry, and medical structural components, effectively replacing stainless steel, aluminum alloys, and expensive rare-metal test parts. Its limitations lie in lower strength compared to Ti6Al4V and inferior high-temperature resistance compared to C103 and molybdenum. Future developments will focus on enhancing strength and temperature resistance through techniques such as grain refinement and surface ceramic modification, enabling CP titanium to continue replacing rare metal materials in anti-corrosion, cryogenic, and high-toughness applications.
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