Preparation of TiN Diffusion Layer by Double Glow Plasma Surface Alloying Process and Its Corrosion Resistance in NaOH Solution
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摘要: 采用双层辉光等离子渗金属技术在Q235钢表面上制备了TiN渗层; 对渗层的组织、硬度、成分和相结构及其耐NaOH溶液腐蚀性能进行了研究。结果表明: 该渗层是由TiN颗粒均匀分布的扩散层及表面TiN沉积层组成的梯度结构; 渗层表面形貌为胞状组织, 颗粒致密均匀, 表面为金黄色, 渗层厚度可达16 μm, 与基体实现了冶金结合; 渗层表面钛和氮原子比为1∶1, 表面显微硬度达到了3 120 HV; 渗层中TiN(111)衍射峰强度最大, 具有明显的择优取向; 渗层在4%的NaOH溶液中的耐腐蚀性能比Q235钢的提高了26.8倍, 与1Cr18Ni9Ti不锈钢的相当。
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关键词:
- 双层辉光等离子渗金属 /
- TiN渗层 /
- 耐腐蚀性能
Abstract: TiN diffusion layer was prepared on Q235 steel surface by using double glow plasma surface alloying technique. The microstructure, hardness, composition, phase structure and corrosion resistance in NaOH solution of the layer were studied. The results show that the diffusion layer had a gradient structure, which was composed of diffusion layer with evenly distributed TiN particles and TiN deposition layer. The surface morphology of TiN layer was cell shape. The golden yellow TiN grains were compact and uniform. The thickness of the layer was 16 μm. A metallurgical bonding layer was obtained between the layer and the matrix. The atom ratio of Ti and N of the TiN diffusion layer surface was 1∶1, and the surface microhardness was 3 120 HV. The strongest diffraction peak intensity of TiN (111) in the TiN diffusion layer had obvious preferred orientation. In 4% NaOH solution corrosion resistance of the TiN diffusion layer was increased by 26.8 times compared with the Q235 steel and as well as 1Cr18Ni9Ti stainless steel. -
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