中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 9 September 2022 |
（1. College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China;
2. Engineering Research Center of Dredging Technology of Ministry of Education, Hohai University, Changzhou 213022, China;
3. College of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China）
Abstract:The microstructure, corrosion and cavitation erosion (CE) behaviors of the as-cast and four different heat treated nickel aluminum bronzes (NABs) in 3.5 wt.% NaCl solution were investigated. The results show that after annealing, β′ transformed into the eutectoid microstructure, and more κIV precipitated from α. Less eutectoid microstructure and more β′ were obtained after normalizing. The quenched NAB mainly consisted of α and β′ phases, and fine, acicular α and κ phases precipitated inside β′ after subsequent aging. The largest proportion of the eutectoid microstructure, which underwent severe selective phase corrosion, was responsible for the lowest corrosion resistance of the annealed NAB. The quenched NAB possessed the most protective film and hence the highest corrosion resistance. The mechanical attack was primarily responsible for the CE damage for the as-cast, annealed and normarlized NABs. The quenched and quenched + aged NABs exhibited superior CE resistance because of the high hardness. The CE-corrosion synergy dominantly caused CE degradation, and it was largely attributed to corrosion-enhanced-CE.
Key words: heat treatment; nickel aluminum bronze; corrosion; cavitation erosion; synergistic effect
