摘要
以Fe-Cr-C合金粉末为原料,采用等离子熔覆技术,在调质C级钢表面制得以原位生成Cr7C3为增强相的新型陶瓷复合材料涂层。分析了涂层的显微组织,并测定其在0.5mol/L的H2SO4溶液及不同浓度的NaCl水溶液中的阳极极化曲线。结果表明,涂层组织为初生相Cr7C3以及γFe与Cr7C3组成的共晶,组织致密并与基材完全冶金结合,由于涂层的组织组成相Cr7C3本身具有极好的耐蚀性并具有快速凝固、细小均匀的显微组织,该涂层在0.5mol/L的H2SO4及3.5wt%NaCl水溶液中均具有优良的耐腐蚀性能。
A new type of reinforcing phase Cr7C3 ceramal composite coating was fabricated on the substrate of C grade steel by plasma clad with the Fe-Cr-C alloy powders. Microstructure of the composite coating was analyzed and electrochemical polarization of the coating in 0. 5mol/L H2SO4 and different concentration NaCl was evaluated. The results show that coating microstructures including primary Cr7C3 and the Cr7C3/γ-Fe eutectics are consistent, and metallurgically bonded to the C grade steel substrate. Because of the inherent excellent corrosion-resisting properties of the constituting phases Cr7C3 and its rapidly solidified homogeneous microstructure ,the plasma clad ceramal composite coating exhibits excellent corrosion resistance in 0. 5mol/L H2SO4 and 3.5wt% NaCl.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2006年第3期33-35,共3页
Heat Treatment of Metals
