Journal
RARE METALS
Volume 42, Issue 9, Pages 3114-3129Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-023-02329-6
Keywords
NiTi; Laser-powder bed fusion (L-PBF); Passive film; Corrosion resistance; Artificial saliva
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Electrochemical testing and surface analysis were used to study the corrosion behavior and passive film characteristics of 3D-printed NiTi shape memory alloys fabricated by laser-powder bed fusion (LPBF) in artificial saliva at 37 degrees C. The passivity of L-PBF NiTi was found to be influenced by process parameters and resulting surface properties. Defects on the surface of L-PBF NiTi promoted early stage passivation rate, but a slowly formed passive film showed the best corrosion protection. The thickness of the passive film was positively correlated with corrosion protection performance. L-PBF NiTi alloy prepared at a linear energy density of 0.2 J.m(-1) and volumetric energy density of 56 J.mm(-3) exhibited the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film showed higher corrosion resistance.
Electrochemical tests and surface analysis were applied to study the corrosion behavior and passive film characteristics of three-dimensional-printed NiTi shape memory alloys fabricated by laser-powder bed fusion (LPBF) in artificial saliva at 37 degrees C. The passivity of L-PBFNiTi shows to be influenced by the process parameters and resulting morphological and physicochemical surface properties. The results show that the defects at the surface of L-PBF NiTi can promote the passivation rate in the early stages of exposure but a slowly formed passive film shows the best corrosion protection. The thickness of the passive film is positively correlated with its corrosion protective performance. The L-PBF NiTi alloy prepared at a linear energy density of 0.2 J.m(-1) and volumetric energy density of 56 J.mm(-3) shows the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film could be also obtained showing higher corrosion resistance.
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