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对0Cr18Ni9不锈钢采用超音速微粒轰击(Supersonic Fine Particles Bombarding,SFPB)进行表面纳米化处理,利用X射线衍射仪和透射电镜对试样表面形成的纳米晶组织进行了检验。对试样表面进行了点蚀试验和动电位极化曲线测试,用扫描电镜对点蚀试样表面形貌进行了观察与分析。结果表明,超音速微粒轰击使试样表面层形成平均尺寸约20nm的纳米晶组织,表面纳米化可以明显改善0Crl8Ni9不锈钢样品在3.5%NaCl溶液中的动电位极化特性,大大提高其抗氯离子腐蚀性能。
The nanocrystallization of 0Cr18Ni9 stainless steel was performed by Supersonic Fine Particle Bombarding (SFPB). The nanocrystalline microstructure formed on the surface of the specimen was examined by X-ray diffraction and transmission electron microscopy. The pitting test and the potentiodynamic polarization curve were carried out on the surface of the sample. The surface topography of the pitting sample was observed and analyzed by scanning electron microscope. The results show that nano-scale nanostructures with an average size of about 20nm can be formed on the surface of the sample by supersonic particle bombardment. The surface nanocrystallization can obviously improve the potentiodynamic polarization of 0Crl8Ni9 stainless steel in 3.5% NaCl solution and greatly improve its resistance to chloride ion Corrosion performance.