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.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2006年第3期127-131,共5页
Transactions of Materials and Heat Treatment
关键词
盐浴渗铬
铬浓度
显微硬度
耐蚀性
Chromium
Corrosion resistance
Microhardness
Microstructure
Polarization
Stainless steel
X ray diffraction analysis
