Microstructure and Corrosion Behavior of Selective Laser‐Melted Al–Ti–Ni Coating on 90/10 Copper–Nickel Alloy. Issue 2 (18th September 2022)

• Record Type: Journal Article
• Authors: Gao, Yuhang; Chen, Xiaohong; Lu, Qingqing; Liu, Yubo; Liu, Ping; Jiang, Tao; Fu, Shaoli; Zhou, Honglei; Miao, Zhen; Chen, Jieru; Ren, Yupeng
• Is Part Of: Advanced engineering materials. Volume 25:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-18
• Subjects: 90/10 copper–nickel alloy -- composite coating -- corrosion resistance -- passive film -- selective laser melting; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202200833
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Al–Ti–Ni composite coatings with different Ti contents (wt% = 20, 25, 30, 35) are prepared on the surface of 90/10 copper–nickel alloy using selective laser melting. The microstructure and phase composition of the coatings are characterized by scanning electron microscopy, X‐ray diffraction, and energy‐dispersive spectrometry, and the corrosion resistance of the four coatings and the 90/10 copper–nickel alloy in 3.5 wt% NaCl solution is investigated. The coatings exhibit a good metallurgical bonding with the substrate, and passive films are formed on the surfaces of the coatings after 6 h of potentiostatic polarization. The coating with a Ti content of 30% has the most compact passive film and the best corrosion protection performance due to the minimal Ti2 O3 content in the passive film, which greatly improves the stability of the passive film. The immersion corrosion mechanism of the coating is pitting corrosion. Electrochemical tests show that the corrosion current density of all four coatings is one order of magnitude lower than that of the substrate, and the coating with a Ti content of 30% has the lowest corrosion current density, indicating that this coating could significantly improve the corrosion resistance of the substrate. Abstract : The corrosion‐resistant Al–Ti–Ni coating is successfully prepared on the surface of 90/10 Cu–Ni alloy using selective laser melting. The appropriate Ti content can reduce the defects inside the coating, improve the stability of the passive film, reduce the formation of surface pitting, and provide good corrosion protection for 90/10 copper–nickel alloy.