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用x射线衍射法分析了18—8不锈钢(SUS304)在N_2+H_2的混合气氛中进行离子氮化后的表面。根据衍射结果研究了氮化表层组织与耐蚀性及硬度的关系。用400℃处理,在材料表面生成数μm深的、具有磁性的硬的(约HMV1000)M_4N[M=(Fe、Cr、Ni)]型氮化层。该氮化层在氧化性溶液中比基体的γ相易受腐蚀,而在强氧化性溶液中则比基体的γ相难以腐蚀。在500℃或600℃处理时,其表面生成含有CrN相的硬氮化层(HMV1250和HMV860)。这层氮化层在任一种非氧化、强氧化的溶液中都比基体γ相易受腐蚀。
The surface of 18-8 stainless steel (SUS304) after ion nitriding in a mixed atmosphere of N 2 + H 2 was analyzed by X-ray diffraction. According to the diffraction results, the relationship between the nitridation microstructure and corrosion resistance and hardness was studied. Treated with 400 ° C to form a few μm deep, magnetically hard (about HMV1000) M_4N [M = (Fe, Cr, Ni)] nitride layer on the surface of the material. The nitrided layer is more corrosive than the γ phase of the matrix in an oxidizing solution and less corrosive than the γ phase of the matrix in a strongly oxidizing solution. When treated at 500 ° C or 600 ° C, a hard nitride layer containing CrN phases (HMV1250 and HMV860) was formed on the surface. This layer of nitride is corrosive to the γ-phase of the substrate in any of the non-oxidizing, strongly oxidizing solutions.