含有Nb、Ce的形状记忆合金FeMnSiCrNi在3.5%NaCl溶液中的空蚀行为  

Cavitation Behavior of Shape Memory Alloy FeMnSiCrNi Containing Nb,Ce in 3.5% NaCl Solution

作　　者：龙霓东[1] 朱金华[2] 

机构地区：[1]空军工程大学,陕西西安710038 [2]西安交通大学,陕西西安710049

出　　处：《稀有金属材料与工程》2009年第7期1169-1173,共5页Rare Metal Materials and Engineering

摘　　要：利用超声波振动仪研究形状记忆合金Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce在3.5%NaCl溶液中的空蚀行为,并探讨合金在3.5%NaCl溶液中处于静态和空蚀情形下的自腐蚀电位和极化曲线。结果表明,Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce合金在3.5%NaCl溶液中呈现优异的抗空蚀性能,空蚀率为0.37mg/h。空化能使Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce合金的自腐蚀电位变负,变化量为–65mV。在静态和空化两种条件下,Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce合金在3.5%NaCl溶液中的自腐蚀电流密度都很低,因此合金具有优异的抗腐蚀性能,其纯腐蚀率和力学效应诱导的腐蚀率仅占空蚀率的2.24%。The cavitation erosion of shape memory alloy Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce in 3.5% NaCl solution was investigated by using an ultrasonic vibratory apparatus. Free corrosion potential and polarisation curves of the alloy in 3.5% NaCl solution under quiescent and eavitating condition were studied. The results show that Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce alloy has excellent cavitation erosion resistance in 3.5% NaCl solution, cavitation erosion rate is 0.37 mg/h. Cavitation can shift free corrosion potential of the alloy in the active direction for about -65 mV. Corrosion current of Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce alloy is very low in 3.5% NaCl solution under quiescent and cavitating condition, therefore, Fe-14Mn-6Si-9Cr-5Ni-Nb-Ce alloy shows high corrosion resistance. The relative contribution of electrochemical corrosion rate and pure mechanical erosion-induced corrosion rate to the overall cavitation eroson only amounts to 2.24%.

关 键 词：空蚀 交互作用 形状记忆合金FeMnSiCrNiNbCe 自腐蚀电位 自腐蚀电流密度 

分 类 号：TG172.9[金属学及工艺—金属表面处理] TG139.6[金属学及工艺—金属学]