Improved corrosion resistance of nickel-aluminum bronze by electron beam powder bed fusion

• Main Authors: Zhai, Wenzheng, Li, Junjie, Zhou, Runhua, Sun, Aidong, Yan, Shuoqing, Wang, Guilan, Zhang, Haiou
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Engineering::Mechanical engineering; Additive Manufacturing; Nickel-Aluminum Bronze
• Online Access: https://hdl.handle.net/10356/172277
• Institution: Nanyang Technological University

The corrosion resistance of nickel-aluminum bronze (NAB) by electron beam powder bed fusion (EB-PBF) from different-size feeding particles is investigated in neutral 3.5 wt% NaCl solutions. Uniformly-distributed precipitates are observed in the samples at the microscale. The βˊ phase that suffered from corrosion preferentially in conventional as-casting NAB is not observed in the EB-PBF NAB. Typically, the corrosion resistance of EB-PBF NAB built from middle-size particles is improved by 1.35 times that of as-casting NAB. This results from a collective effect of high relative density and uniformly-distributed precipitates, which mitigates selective phase corrosion and promotes the formation of corrosion products with uniform thickness.