摘要
将白铜管分别浸入280,320,360和400℃熔融锡中保温2,4,6,8和10 h,冷却后采用金相显微镜观察溶蚀产物形貌及检测管壁厚度,根据试验数据建立溶蚀速率数学模型,采用扫描电镜及能谱仪分析反应产物及成分组成,探讨溶蚀机理。结果表明,随着熔融锡温度的升高,白铜管溶蚀速率增大,从280℃开始,熔融锡温度每升高40℃,白铜管的溶蚀速率递增0.05 mm/h,溶蚀产物为含有Cu-Ni-Sn元素的金属间化合物,白铜管的减薄机理是在白铜管与熔融锡接触界面铜和镍与锡发生反应,使白铜管中的铜和镍不断进入熔融锡中导致白铜管溶蚀消耗而减薄。
The cupronickel alloy tubes are immersed in the molten SnAg3 Cu0.5 at 280, 320, 360 and 400 ℃ corroding for 2,4,6,8, 10 h. The cooled samples are analyzed by optical microscopy to detect corrosion product morphology and wall thickness. The mathematical model of the dissolution rate based on experimental data is established. SEM and EDS are utilized to analyze the morphology and the ingredients of corrosion products. The mechanism of corrosion of cupronickel alloy tube is discussed. The results show that corrosion rate is increased with the temperature increasing, the corrosion rate of the tube wall is increased with 0.05 mm/h while the molten tin is increased with 40℃ from 280℃. The corrosion products are various intermetallic compounds of Cu, Ni and Sn. The tube thinning mechanism is that the Cu and Ni from the white brass react with Sn from the molten tin on the contact interface, so that the Cu and Ni in white brass are continuously dissolved in the molten tin, it results in the cupronickel alloy tubes corroding consumption and thinning.
出处
《有色金属工程》
CAS
CSCD
北大核心
2015年第3期15-18,32,共5页
Nonferrous Metals Engineering
