激光增材Ni-Cr-Cu表面的抑菌、耐磨性和耐腐蚀性研究

Study on Bacteriostasis, Wear Resistance and Corrosion Resistanceof Laser Additive Ni-Cr-Cu Surface

改变激光扫描速率,在Q235碳钢表面激光增材Ni-Cr-Cu,并使用SEM、EDS以及显微维氏硬度计分析表面的微观组织、元素成分及硬度,用销盘式摩擦磨损试验机与电化学工作站分析耐摩性和耐蚀性,专门设计适用于测试增材表面抑菌性的试验方法分析抑菌性。结果表明,各表面微观组织以树枝晶与胞状晶为主,扫描速率对晶粒饱满程度有明显影响,组织中有硬度高达1500 HV的富Cr析出相及Cu元素含量达13.21%的黑色底相;表面的硬度、耐磨性与耐蚀性均优于基体,因耐蚀性的提高,其短期的抑菌性会受到影响。在扫描速率为700 mm/min时,各性能均表现优异,其综合性能达到最好。

Changing the laser scanning speed,Ni-Cr-Cu was fabricated on the surface of Q235 carbon steel by laser additive technology.The microstructure,element composition and hardness of the surfaces were characterized by means of SEM,EDS and vickers indenter.The abrasion and corrosion resistance of surfaces were analyzed by pin on disk tribometer and electrochemical workstation respectively.And antimicrobial properties of surfaces were investigated by self-designed bacteriostasis test.The results show that the microstructure of surfaces is mainly filled with dendritic and cellular crystals.The crystalline grain fullness is deeply affected by the scanning rate.The Chromium-rich phase whose microhardness is up to 1500 HV and black phase with 13.21%Cu are also found in the microstructure of bacteriostasis surfaces.The hardness,wear resistance and corrosion resistance of the surfaces are found to be better than those of the substrate,and the corrosion resistance is greatly improved.Due to the improvement of corrosion resistance,the short-term antibacterial properties of surfaces are affected.And it is found that the comprehensive performance under the laser scanning rate of 700 mm/min is best.