强流脉冲离子束辐照对不锈钢耐腐蚀性能的影响

 利用强流脉冲离子束（HIPIB）对316L不锈钢进行了表面辐照处理，研究了HIPIB辐照对其在0.5mol/L H2SO4溶液中电化学腐蚀性能的影响。极化曲线测量结果表明，HIPIB辐照能够显著提高316L的抗腐蚀性能，自腐蚀电流对辐照次数的依赖性与自腐蚀电位相比明显较强。采用扫描电子显微镜（SEM）、X射线衍射（XRD）和电子探针（EPMA）分析辐照后试样表面形貌、表面层相结构和元素分布的变化。结果表明：HIPIB辐照使试样表面光滑化，表面层产生择优取向，且发生了杂质元素的选择性烧蚀，是316L不锈钢耐电化学腐蚀性能得以提高的主要原因。

Influence of high-intensity pulsed ion beams irradiation on corrosion resistance of stainless steel

The surface of 316L stainless steel was treated by high-intensity pulsed ion beams(HIPIB).The influence of the HIPIB irradiation on the electrochemical corrosion resistance of 316L stainless steel in 0.5 mol/L H2SO4 was investigated.The polarization curves show that the corrosion resistance of the irradiated specimens can be improved markedly, and the free corrosion current depends more on the shot number of HIPIB than the free corrosion potential.The surface morphology and the phase structure in the near surface region of the original and the treated specimens were analyzed with scanning electron microscopy and X-ray diffraction.Electron probe microanalysis was used to study the distribution of elements on the irradiated specimens. It is found that the HIPIB irradiation can smooth the surface of the targets,and preferred orientation occured in the surface layer of the treated specimens.Otherwise,selective ablation of impurities occurred during the interaction between HIPIB and the targets.All of these factors result in the improvement of the electrochemical corrosion resistance of 316L.