T12钢盐浴渗铬工艺对渗层组织和性能的影响  

Effect of salt-bath chromizing process on microstructure and properties of chromized layer

作　　者：李学伟[1] 赵品[2] 

机构地区：[1]黑龙江科技学院材料科学与工程系,哈尔滨150027 [2]河北亚稳材料制备技术与科学重点实验室燕山大学材料学院,秦皇岛066004

出　　处：《材料热处理学报》2006年第3期127-131,共5页Transactions of Materials and Heat Treatment

摘　　要：采用正交实验方法优化T12钢的低温盐浴渗铬工艺。正交实验表明,以BaCl2-CaCl2为基盐,以Cr2O3+铬盐(Cr3+)+铬粉+NaF为渗铬剂,在0.15MPa氩气保护下,经850℃×6h渗铬,可获得与基体结合良好的48μm的渗铬层,渗层表面铬浓度约86.9wt%,表面硬度可达1750HV。渗铬表层主要物相为Cr7C3、Cr2C、Cr和(Cr,Fe)2O3组成。渗铬层具有优良耐蚀性,阳极极化曲线的测定分析证明渗铬层的耐腐蚀性能优于1Cr18Ni9Ti不锈钢。In order to find the optimum technology of low temperature salt-bath chromizing process of T12 steel, the method of orthogonal test was used. The result shows that the optimum technology is 850°C × 6 h chromizing process, whose base salt is BaCl2-CaCl2 and chromizing agent is Cr2O3 + chromic salt(Cr3+) + chromium powder+NaF with protection of Ar gas. The thickness of the chromizing layer is 48μm, microhardness is about 1750HV and chromium concentration of the layer is about 86.9wt%. The X-ray diffraction analysis of chromized layer indicates that main phases of the layer are Cr7C3, Cr2C, Cr and(Cr, Fe)2O3. Anode polarization curves of the samples show that the corrosion-resistance of T12 steel layer after salt-bath chromizing treatment is better than that of 1Cr18Ni9Ti stainless steel.

关 键 词：盐浴渗铬 铬浓度 显微硬度 耐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理]