摘要
利用超声波振动仪研究了Fe-14Mn-6Si-9Cr-5Ni铁基形状记忆合金在蒸馏水和w(NaCl)=3.5%NaCl溶液中的空蚀行为,并测定了Fe-14Mn-6Si-9Cr-5Ni合金在3.5%NaCl溶液中处于静态和空蚀两种情形下的自腐蚀电位和自腐蚀电流。结果表明,Fe-14Mn-6Si-9Cr-5Ni合金在蒸馏水中的空蚀抗力明显高于在w(NaCl)=3.5%NaCl溶液的空蚀抗力,前者约为后者的3.7倍。在w(NaCl)=3.5%NaCl溶液中,空化使Fe-14Mn-6Si-9Cr-5Ni合金的自腐蚀电位变正,自腐蚀电流增大,从而使电化学腐蚀加速,腐蚀的加速又促进了空蚀过程的纯力学效应。纯力学效应与电化学腐蚀两者的交互作用所造成的质量损失占空蚀率的71%。
The cavitation erosion of iron-based shape memory alloy Fe-14Mn-6Si-9Cr-5Ni in distilled water and 3.5%NaCI solution was investigated by an ultrasonic vibratory apparatus. Free corrosion potential and corrosion current of Fe-14Mn-6Si-9Cr-5Ni alloy in 3.5%NaCI solution under quiescent and cavitating condition were studied. The results show that Fe-14Mn-6Si-9Cr-5Ni alloy has higher cavitation erosion resistance in distilled water than in 3.5% NaC1 solution, cavitation erosion resistance in the former is about 3.7 times that in the latter. Cavitation can increase free corrosion potential and corrosion current of Fe-14Mn-6Si-9Cr-5Ni alloy, and accelerates its electrochemical corrosion, which in turn intensifies pure mechanical erosion. The relative contribution of corrosion- mechanical erosion synergism to the overall cavitation erosion in 3.5%NaC1 solution amounts to 71%.
出处
《热加工工艺》
CSCD
北大核心
2009年第16期45-47,共3页
Hot Working Technology
关键词
空蚀
铁基形状记忆合金
自腐蚀电位
交互作用
cavitation erosion
iron-based shape memory alloy
flee corrosion potential
synergism
