电火花沉积Invar/非晶复合涂层的组织与性能  

Microstructure and properties of electro-spark deposited Invar/amorphous composite coatings

作　　者：何艳玲 王彦芳 斯佳佳 石志强 He Yanling;Wang Yanfang;Si Jiajia;Shi Zhiqiang(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,山东青岛266580

出　　处：《金属热处理》2022年第11期238-244,共7页Heat Treatment of Metals

基　　金：山东省自然科学基金(ZR2019MEM032)。

摘　　要：采用电火花沉积技术在45Mn2钢基材表面沉积了Invar、Invar/非晶及Invar/非晶/Invar涂层,通过X射线衍射仪(XRD)、扫描电镜(SEM)、摩擦磨损试验仪和电化学工作站等分析了沉积层的组织结构、摩擦磨损和电化学腐蚀性能。结果表明,制备的涂层致密、均匀,与基材呈冶金结合。采用Invar合金打底,获得了约60μm厚度的无显著裂纹Invar/非晶/Invar涂层。Invar涂层为FCC固溶体结构,Invar/非晶和Invar/非晶/Invar涂层为非晶/固溶体复相结构。Invar、Invar/非晶和Invar/非晶/Invar沉积层的平均硬度分别为176.6、757.7和772.8 HV0.1,摩擦因数分别为0.44、0.21和0.19。提高沉积层非晶含量可提高硬度,降低摩擦因数,提高耐磨性。沉积层在3.5%NaCl溶液中没有明显的钝化现象,Invar、Invar/非晶及Invar/非晶/Invar涂层的自腐蚀电位分别为-0.74、-0.54、-0.34和-0.31 V,自腐蚀电流密度分别为7.08、5.15、3.78和3.11μA·cm^(-2)。电火花沉积的Invar/非晶/Invar涂层致密、均匀、无裂纹,可极大提高45Mn2钢基体表面的耐磨及耐蚀性能。Invar,Invar/amorphous and Invar/amorphous/Invar coatings were deposited on the 45Mn2 steel surface by electro-spark deposition technique using invar alloy electrode and pre-put Fe-based amorphous powders.The phase composition,microstructure,tribology behavior and electrochemical corrosion behavior in 3.5%NaCl solution of the deposited coatings were analyzed.The results show that the prepared coatings are continuous and uniform with a metallurgical bonding to the substrate.A 60μm crack-free Invar/amorphous/Invar coating is obtained by an Invar bond layer produced on the substrate firstly.The Invar deposited coating is mainly consisted of FCC Fe-Ni solid solution,the Invar/amorphous and Invar/amorphous/Invar coatings are amorphous/solid composite structure.The average microhardness and friction coefficient of the Invar,Invar/amorphous and Invar/amorphous/Invar coatings are 176.6,757.7,772.8 HV0.1 and 0.44,0.21,0.19,respectively.Increasing the amorphous content of the deposited coating can improve the hardness,reduce the friction coefficient and improve the wear resistance.No obvious passivation phenomenon of the deposition coatings in 3.5%NaCl solution can be observed.The self-corrosion potential,self-corrosion current density of the substrate,Invar,Invar/amorphous and Invar/amorphous/Invar coatings are-0.74,-0.54,-0.34,-0.31 V and 7.08,5.15,3.78,3.11μA·cm^(-2),respectively.The Invar/amorphous/Invar coating prepared by electro-spark deposition technology can effectively improve the wear resistance and corrosion resistance of the 45Mn2 steel substrate.

关 键 词：电火花沉积 Invar合金 非晶合金涂层 组织 性能 

分 类 号：TG139.8[一般工业技术—材料科学与工程]