借助扫描电镜（SEM/EDX）、X射线衍射（XRD）研究了NaCl单个因素对镁合金AZ9lD初期腐蚀行为的影响，并对SO2和NaCl的协同作用进行了探讨。Nacl存在时初期破坏金属表面的保护膜，但后期微溶性腐蚀产物的生成导致腐蚀速率的降低。当NaCl和SO2同时存在时，反应生成的可溶性产物不具有阻碍的作用，同时他们会发生部分溶解生成自由移动的离子，大量难溶物在镁合金表面难以短时间形成，故Nacl和SO2同时存在引起的腐蚀远大于两者单独存在时引起的腐蚀加和。NaCl和SO2对镁合金的初期大气腐蚀具有明显的协同作用。

选用Cr-Mo钢经400℃，20MPa，104h氢暴露后进行拉伸、断裂韧性和疲劳试验。结果表明：Cr-Mo钢已经发生了氢腐蚀，氢蚀使Cr-Mo钢强度、塑性和断裂韧性均有所降低，也使断裂机制由韧窝型转变为解理脆性。氢蚀使疲劳裂纹扩展行为也发生了变化，疲劳裂纹扩展速率增加，△Kth降低。Cr-Mo钢氢蚀后，随应力比增加，疲劳裂纹扩展门槛值大幅度降低。

The healing mechanism of hydrogen-attacked cracks in low carbon steel and Cr-Mo steel and its influencing factors during the healing process were studied by recovering heat treatment of split specimens in vacuum. The result showed that crack pacing turns much smaller under the condition of pure heating, especially for crack tips. The healing effect is well related to the length of cracks with the shorter in priority. By the primary mechanism of thermal diffusion, iron and carbon atoms must diffuse at the high speed in steel to realize that plasticity deformation energy exceeds and overcomes surface tensile force energy. In addition, phase transformation and stress-stain relationship also have positiwe effects on the process.