ERD和PAS研究微量硼对搪瓷钢捕氢的影响

EFFECT OF TRACE BORON ON TRAPPING HYDROGEN BY ERD AND PAS

用弹性反冲探测（ＥＲＤ）和正电子湮没寿命谱（ＰＡＳ）测量了含硼和不含硼钢的充氢曲线和释氢曲线．结果表明含硼钢充氢速率比不含硼钢大４倍多，前者充氢以缺陷捕获氢为主，而后者充氢以溶解氢为主．２２０℃释氢时不含硼钢中的释氢速率比含硼钢大约３倍，同时２２０℃释氢使含硼钢中的氢峰向表面移动了２５ｎｍ，而不含硼钢约移动５０─９０ｎｍ．表明微量硼能阻止热释氢向搪瓷层／钢界面扩散和积聚，从而防止可能产生的鳞爆现象．

The hydrogen charging curves and releasing curves have been measured by ERD and PAS. The hydrogen charging rate for the bearing B steel is 4 times faster than that for the unbearing B steel. Hydrogen atoms in bearing B steel are mostly trapped by defects (grain boundary. interface of boride, etc.). but in unbearing B steel are mostly dissolved atoms. However, hydrogen releasing rate when annealing at 220℃for unbearing B steel is about 3 times faster than bearing B steel. After annealing at 220℃.the peak of hydrogen in bearing B steel has been moved towards the surface by 25 nm. but in unbearing B steel the movement of the peak is about 50-90 nm. These results indicate that trace B in the steel can retard hydrogen atoms from diffusing towards interface of the emalled coating and the steel.So that trace B can get rid of the busting of the coating during or after the baking process.