316L不锈钢在Saline溶液中的微动磨蚀行为研究

Study on the Fretting Corrosion-wear Behavior of 316L Stainless Steel in Saline Solution

采用球 -平面接触微动磨损试验设备考察了轧制固溶 31 6L不锈钢在 Saline溶液中的微动磨蚀行为 .研究表明 ,31 6L不锈钢的微动过程存在显著的阶段性 :微动初期为磨合期 ;第一稳定阶段摩擦副处于高摩擦应力状态 ,伴随着不锈钢表面缝隙腐蚀与弹塑性损伤的积累 ;第二过渡阶段和第二稳定阶段不锈钢表面呈微断裂剥层特征 ,腐蚀引起的微断裂不可忽视 .不锈钢微动损伤表面形貌同微动损伤速率之间存在对应关系 .

The fretting corrosion wear behavior and mechanism of 316L stainless steel in saline solution have been investigated with a fretting test rig in a ball on disc contact configuration. The worn surface morphologies and corrosion wear mechanisms have been examined by means of scanning electron microscopy. As the results, the fretting process can be divided into four stages. Namely, stage 1 refers to the initial or running in stage where the worn steel surface is characteristic of slight wear, though the wear rate rises considerably with increase of fretting cycle in this stage. Stage 2 refers to the first steady stage where the fretted surface of the stainless steel shows signs of severe plastic and elastic deformation, and a high friction coefficient is recorded. The signs of crevice corrosion are also observed in the first steady stage, due to the mechanical damage and closed fretted area. With the increase in the fretting cycle, both the mechanical damage and crevice corrosion effects accumulate. Then it comes to stages 3 and 4, the second transitional and steady stages where the fretting damage is largely attributed to micro crack and corrosion fatigue. Moreover, there exists some correlation among the friction coefficient variation and the fretting damage rate and fretting mechanisms.