The interaction of mechanical components experiencing relative movements and cyclic loads in a corrosive environment is known as fretting corrosion or tribocorrosion. In the current work, the mechanism of crack initiation and propagation in dovetail slots of Ti6Al4V samples (in contact with carbide rods) under fretting corrosion conditions was investigated. A newly developed test rig installed on a universal testing machine was used to conduct tests at 20 Hz frequency under 5 and 7.5 kN fretting loads. Tests were conducted at room temperature in 3.5% NaCl and phosphate-buffered saline solutions. Crack propagation in all samples was examined by a metallurgical microscope, and the detailed analysis of fractured samples was carried out by a scanning electron microscope. In comparison to dry conditions, early crack initiation and faster crack propagation were observed in salt and physiological solution environments. Colored spots and large amounts of chlorine, sodium, and oxygen were found around cracks, and plastically deformed regions in the 3.5% NaCl environment provided the evidence of a corrosive attack. Large amounts of oxygen, phosphorous, chlorine, potassium, and sodium were detected in the phosphate-buffered saline environment.

中文翻译：

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人工海水和生理溶液摩擦腐蚀条件下Ti6Al4V薄板微动疲劳裂纹的萌生和扩展

在腐蚀环境中经历相对运动和循环载荷的机械部件之间的相互作用被称为微动腐蚀或摩擦腐蚀。在目前的工作中，研究了微动腐蚀条件下 Ti6Al4V 样品（与硬质合金棒接触）燕尾槽中裂纹萌生和扩展的机制。新开发的试验台安装在万能试验机上，用于在 5 和 7.5 kN 微动载荷下以 20 Hz 频率进行试验。测试在室温下在 3.5% NaCl 和磷酸盐缓冲盐溶液中进行。用金相显微镜检查所有样品中的裂纹扩展，用扫描电子显微镜对断裂样品进行详细分析。与干燥条件相比，在盐和生理溶液环境中观察到早期裂纹萌生和更快的裂纹扩展。在裂缝周围发现了彩色斑点和大量氯、钠和氧，3.5% NaCl 环境中的塑性变形区域提供了腐蚀侵蚀的证据。在磷酸盐缓冲盐水环境中检测到大量的氧、磷、氯、钾和钠。