Abstract Interruptions of the passive layer of stainless steels by cavitation erosion expose the bare metal surface to the environment and can lead to cavitation-erosion-corrosion damage and synergistic effects. However, the probability for pitting corrosion is decreased during cavitation exposure of stainless steels in chloride solutions because mechanical passive film removal shifts corrosion potentials to lower cathodic values. In this study, the impact of 3.5 wt% NaCl in water on mass loss and damage features of two austenitic stainless N-containing steels is investigated to amend the understanding of cavitation erosion of passivating steels.Ultrasonic cavitation tests were carried out on steels 316LVM and CNMo0.95 in distilled water and 3.5% NaCl solution. Exposed surfaces were characterized qualitatively by light- and electron-microscopy and quantitatively by confocal microscopy.Damage mechanisms vary between the two steels but not with NaCl content in the solution. 316LVM also displayed the same mass loss in both solutions. CNMo0.95 possesses twice the strength as 316LVM, resulting in lower intensities of ductile damage mechanisms and slower damage progression. Mass loss of CNMo0.95 was lower in 3.5% NaCl solution compared to distilled water, which was primarily assigned to the effect of the salt content in the water on cavitation bubble formation.

中文翻译：

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含氮奥氏体钢在 3.5% NaCl 溶液中空蚀的损伤机制

摘要 空蚀对不锈钢钝化层的破坏使裸金属表面暴露于环境中，并可能导致空蚀-侵蚀-腐蚀损伤和协同效应。然而，在不锈钢在氯化物溶液中的空化暴露期间，点蚀的可能性会降低，因为机械钝化膜去除会将腐蚀电位转移到较低的阴极值。在这项研究中，研究了水中 3.5 wt% NaCl 对两种奥氏体不锈钢含氮钢的质量损失和损伤特征的影响，以修正对钝化钢空蚀的理解。 对钢 316LVM 和钢进行了超声空化试验。 CNMo0.95 在蒸馏水和 3.5% NaCl 溶液中。暴露的表面通过光学和电子显微镜定性表征，并通过共聚焦显微镜定量表征。两种钢之间的损伤机制不同，但溶液中的 NaCl 含量不同。316LVM 在两种溶液中也显示出相同的质量损失。CNMo0.95 的强度是 316LVM 的两倍，导致韧性损伤机制的强度较低，损伤进展较慢。与蒸馏水相比，CNMo0.95 在 3.5% NaCl 溶液中的质量损失较低，这主要是由于水中的盐含量对空化气泡形成的影响。导致韧性损伤机制的强度较低和损伤进展较慢。与蒸馏水相比，CNMo0.95 在 3.5% NaCl 溶液中的质量损失较低，这主要是由于水中的盐含量对空化气泡形成的影响。导致韧性损伤机制的强度较低和损伤进展较慢。与蒸馏水相比，CNMo0.95 在 3.5% NaCl 溶液中的质量损失较低，这主要是由于水中的盐含量对空化气泡形成的影响。