摘要
采用激光重熔对高锰铝青铜进行表面处理,并通过显微组织观察、电化学测试和超声振动空蚀等实验,研究激光重熔对铸态高锰铝青铜微观组织、腐蚀和空蚀行为的影响。结果表明,重熔后合金组织明显细化,且晶粒分布均匀,硬度相对于铸态合金提高了约45%。电化学实验结果表明,重熔处理合金与铸态合金的电极反应过程相似,但铸态合金的腐蚀电位较低,腐蚀倾向较大。空蚀实验结果表明,在3.5%NaCl溶液中空蚀5 h后,重熔处理合金的失重率仅为铸态合金的3/5。空蚀形貌观察结果表明,重熔处理合金表面损伤较轻且分布较均匀,表面粗糙度明显小于铸态合金。铸态和激光重熔合金的纯空蚀作用引起的失重占空蚀总失重比例分别为71.1%和50.8%,即力学冲击是造成空蚀损伤的主导因素。
Laser remelting(LSM) was applied on cast high-Mn aluminum bronze(MAB). Then the effect of LSM on the microstructure, corrosion and cavitation erosion behavior in 3.5%NaCl solution for the cast MAB was studied via microstructure observation, electrochemical test and ultrasonic vibration cavitation test. The results showed that in comparison with the as cast bronze, the LSM bronze presents a microstructure of much finer and much homogeneously distributed crystallites, as well as a hardness of45% higher. During electrochemical test, the LSM bronze shows more or less the same anodic and cathodic processes as that of the as cast one, however the cast bronze had a lower corrosion potential, indicating higher corrosion tendency. After cavitation erosion test in 3.5%NaCl solution for 5 h the weight loss rate of the LSM bronze was only 3/5 of that of the as cast one. Accordingly, the surface damage of the LSM bronze was much lighter with a similar damage degree everywhere, whilst the surface roughness of the LSM bronze was obviously smaller than that of the as cast one. In 3.5%NaCl solution, the synergy between corrosion and cavitation erosion deteriorated the surface damage. For both the as cast and the LSM bronze, the mechanical impact was the dominated factor for the cavitation erosion damage. For the cast bronze, the mass loss caused by the pure cavitation erosion accounted for 71.1% of the total mass loss and 50.8% for the LSM bronze.
作者
宋亓宁
武竹雨
李慧琳
佟瑶
许楠
包晔峰
SONG Qining;WU Zhuyu;LI Huilin;TONG Yao;XU Nan;BAO Yefeng(Engineering Research Center of Dredging Technology of Education,Hohai University,Changzhou 213022,China;College of Mechanical and Electrical Engineering,Hohai University,Changzhou 213022,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2021年第6期877-882,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51601058,51879089)
中央高校基本科研业务费专项(B210202129,B200204036)
江苏省自然科学基金(BK20191161)。
关键词
高锰铝青铜
激光重熔
腐蚀
空蚀
交互作用
Manganese-nickel-aluminum bronze
laser surface melting
corrosion
cavitation erosion
synergy
