It is concluded that hydrogen brittlement of the disloation-tooth circletproduced during zinc coating is the reason of fracture failure.

• 通过金相显微镜观察、扫描电镜分析、能谱分析和含氢量的测定,得出错齿垫圈断裂失效是由于在镀锌过程中产生氢脆的结论。