采用扫描电镜、X射线衍射方法对Mg合金AZ9lD在城市大气中的腐蚀层形貌，腐蚀产物进行了分析和研究。结果表明：腐蚀初期在材料表面生成一层Mg（OH）2薄膜，随着腐蚀的不断进行，膜增厚并开裂，最终形成网状结构。在裂纹处水蒸气容易凝聚，腐蚀性气体及盐粒容易吸附，且裂纹或缝隙为氧的扩散提供了通道，造成Mg合金局部腐蚀严重。生成的腐蚀产物主要为Mg（oH）2，A1（oH）3，Mg2CO3（oH）2·3H2O和Mg2（oH）3Cl·4H20，这些微溶的腐蚀产物对基体起到了一定的保护作用，从而在后期降低了Mg合金的腐蚀速率。

对氢蚀前后低碳钢拉伸过程中的声发射（AE）行为进行了研究。结果表明，氢蚀使低碳钢拉伸过程事件数明显减少，但是高幅声发射信号的振铃计数明显增多。声发射源以显微裂纹长大与连接为主。

The experiments were aimed at obtaining crack healing of hydrogen attack (HA) in low carbon steel by heat treatment. It was observed by SEM that HA cracks experienced different healing effects. The results indicated that the HA cracks≤10μm length can be healed completely by cyclic heat treatment between room temperature and 1000℃. Five cycles totalling 10 hours were used. The studies performed showed that crack healing is controlled by diffusion and that the recovery kinetics depend on the plastic deforming energy Es arising from the growth of HA bubbles or cracks. These findings led to the conclusion that the critical condition for healing of bubbles or cracks is Es≥2γ/r (where γis the surface tension, r is the radius of bubbles or half length of cracks) provided the atoms of H, C, Fe can diffuse rapidly.