目的 研究 316L 不锈钢生物医用材料植入体内初期的表面行为。 方法 在模拟体液中，采用浸泡实验，表征了 316L 不锈钢浸泡不同时间的表面形貌、润湿性及耐腐蚀性。 结果 白光干涉测试结果表明，样品表面粗糙度随浸泡时间的延长而变大。浸泡 1 d 后，在样品表面出现大量无规则的腐蚀坑，腐蚀坑内出现金属的溶蚀。润湿性测试结果显示，随浸泡时间的延长， 316L 不锈钢的接触角减小，亲水性增强，表面能增加。电化学测试表明，浸泡 1 周后， 316L 不锈钢的自腐蚀电流为浸泡前的 3 倍多，腐蚀速度增大，耐腐蚀性变差。 结论 在模拟体液中， 316L 不锈钢表面存在局部腐蚀，材料的表面形貌、成分、润湿性及耐腐蚀性均发生改变。

The work aims to investigate the surface behavior of 316L stainless steel (316L SS) implanted in the body at the preliminary stage. The surface morphology, wettability and corrosion resistance of 316L SS in simulated body solution based on immersion test were characterized. The results of white light interference test showed that surface roughness increased with increasing immersion time. A large amount of irregular corrosion pits were found on the surface of 316L SS after immersion for 1 day. Metal ions were released in the corrosion pits. Wettability test results showed that, with prolonged immersion time, the contact angle of 316L SS decreased, while the hydrophily improved and surface energy increased. The electrochemical test indicated that self-corrosion current of 316L SS after immersion for 1 week was threes times the amount of the one before immersion. The corrosion rate increased and corrosion resistance became worse. Local corrosion on the surface of 316L SS occurs in simulated body solution. The surface morphology, composition, wettability and corrosion resistance of 316L SS are changed.