利用磁致伸缩空蚀实验机研究了CrMnN双相不锈钢在3%NaCl溶液中的空蚀行为,采用电 化学技术测量了静态和空蚀条件下的自腐蚀电位变化和动电位扫描极化曲线.利用扫描电镜 (SEM)跟踪观测了试样表面的空蚀形貌.结果表明：CrMnN双相不锈钢的抗空蚀性能优于水轮 机的常规用材0Cr13Ni5Mo.CrMnN双相不锈钢的空蚀破坏首先在铁素体相发生，铁素体相的 失效方式为脆性失效，而奥氏体相是延性失效.奥氏体相区由滑移和孪生引起的塑性变形消 耗了空泡溃灭产生的冲击能量，从而提高CrMnN双相不锈钢的抗空蚀性能.在NaCl溶液中，空 蚀使CrMnN不锈钢的自腐蚀电位负移300 mV，阳极电流密度增大近3个数量级，但由NaCl引 起的失重量对总失重量的贡献很小.
The cavitation erosion (CE) behavior of CrMnN ferri te-austenite duplex stainless steel in distilled water and 3%NaCl solution has b een investigated by using a magnetostrictive-induced cavitation facility.The fre e-corrosion potential and polarization curve under quiescent and cavitating cond ition have been measured by electrochemical technique.The micrographs of damaged surfaces were observed by scanning electron microscope (SEM).It was found that the cavitation resistance of CrMnN steel was higher than that of CrNiMo steel.T he failure mode of ferrite phase was brittle fracture，which had adverse effect on the resistance to CE，while the austenite phase failure was a ductile failure in CrMnN steel.The excellent resistance to CE was related to the good mechanica l properties of austenite phase and the consumption of cavitation energy by plas tic deformation involving slip and twinning.The cavitation shifted the free-corr osion potential in the active direction about 300 mV and increased the current d ensity which maintained the passivity of stainless steel in order of 3，the comp onent of total weight loss directly and indirectly caused by chloride sodium was 5.7%.
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