原子氧对不锈钢的作用

目的研究空间原子氧辐照对不锈钢性能的影响。方法将不锈钢试样置于束流密度为2.5×10~(16)atoms/(cm~2·s)的原子氧束中进行辐照试验,最长辐照时间为300 min。研究随辐照时间增加,试样质量、光学性能、接触角、耐磨性能、耐腐蚀性能的变化。结果原子氧辐照后,不锈钢表面生成氧化物质量增加;随辐照时间增加,试样光谱反射系数呈下降趋势,太阳吸收比增加;原子氧作用导致不锈钢接触角增大,耐磨性能提高,耐腐蚀性能下降。结论得到的不锈钢原子氧环境效应数据,可为其在低轨航天器上的应用提供理论基础。

Irradiation Effect of Atomic Oxygen on Stainless Steel

Objective To study the irradiation effect of atomic oxygen (AO) on stainless steel. Methods AO irradiation test of stainless steel was conducted using an AO simulation facility with AO flux of 2.5×1016 atoms/cm2·s and the maximum irradiation time was 300 min. The variations of mass, optical property, contact angle, wear resistance and corrosion resistance of the specimens with prolonged irradiation time were investigated. Results After AO exposure, metal oxides were found on the surface of stainless steel, leading to increase of sample mass. The spectrum reflectance of copper decreased with the increasing irradiation time, while the solar absorption ratio showed the opposite trend, which increased with increasing irradiation time. In addition, AO irradiation resulted in the increase of contact angle and wear resistance property, and meanwhile decrease of corrosion résistance property. Conclusion AO effect data of stainless steel was obtained, which can provide theoretical support for the application of stainless steel in low earth orbit spacecraft.