热丝激光熔覆17–4PH涂层组织与腐蚀磨损性能  

Microstructure and Tribocorrosion Properties of Hot-wire Laser Cladding 17-4PH Coating

作　　者：张安琪 王彦芳 牛德文 石志强 何艳玲 王海新 苏成明 ZHANG An-qi;WANG Yan-fang;NIU De-wen;SHI Zhi-qiang;HE Yan-ling;WANG Hai-xin;SU Cheng-ming(School of Materials Science and engineering,China University of Petroleum(East China),shandong Qingdao 266580,china;Five-Star Vehicles Plant,WeiChai Lovol Heavy Industry Co.,Ltd.,Shandong Zhucheng 262233,china;Shaanxi Tyon Intelligent Remanufacturing Co.,Ltd.,Xi’an 710055,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 [2]潍柴雷沃重工股份有限公司五星车辆厂,山东诸城262233 [3]陕西天元智能再制造股份有限公司,西安710055

出　　处：《表面技术》2022年第9期379-386,共8页Surface Technology

基　　金：山东省自然科学基金(ZR2019MEM032)。

摘　　要：目的在低碳钢表面高效制备沉淀硬化马氏体不锈钢涂层,研究涂层在腐蚀磨损苛刻条件下耦合损伤行为。方法采用热丝激光熔覆技术在20钢基材表面制备17–4PH马氏体不锈钢涂层,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)等分析涂层的相组成和显微组织,采用电化学腐蚀摩擦磨损试验仪对涂层的摩擦磨损、极化曲线、电化学阻抗谱(EIS)及腐蚀磨损耦合行为进行研究。结果制备的涂层组织均匀、致密,无裂纹、气孔等缺陷,主要由马氏体相组成。熔覆区的平均硬度约为310HV0.1,约是基材硬度的1.5倍,自腐蚀电流密度为6.583×10^(‒8) A/cm^(2),具有优异的耐蚀性。在3.5%NaCl溶液中,随摩擦载荷的增加,涂层的开路电位下降,摩擦因数增大,自腐蚀电位下降,腐蚀电流密度增大,摩擦对腐蚀促进作用明显。结论热材激光熔覆技术节能、高效,制备的17–4PH涂层结构致密、性能优异,可用于在腐蚀磨损苛刻环境下零部件的表面改性。Precipitation-hardened martensitic stainless steels have excellent comprehensive mechanical properties and corrosion resistance,and are widely used in aviation,aerospace,Marine and petrochemical industries.In this paper,a 17-4PH martensitic stainless steel coating was prepared on the surface of low carbon steel by hot-wire laser cladding technology. The microstructure and tribocorrosion properties of the coatings were analyzed. The results show that the microstructure of the coating is uniform, compact, and no defects such as cracks and pores. The coating is mainly composed of martensite phase. The average hardness of the cladding zone is about 310HV0.1, which is about 1.5 times of the hardness of the substrate. The corrosion current density is 6.583×10^(‒8) A/cm^(2), showing excellent corrosion resistance. In 3.5% NaCl solution, with the increase of friction load, the open circuit potential of the coating decreases, the friction coefficient increases, the corrosion potential decreases, and the corrosion current density increases. The friction has a significant promoting effect on the corrosion. This paper can not only provide new ideas and methods for surface modification of materials, but also provide data for the use of 17-4PH coating in harsh corrosive wear environment.

关 键 词：热丝材激光熔覆 17–4马氏体不锈钢涂层 显微组织 腐蚀磨损 

分 类 号：TG172[金属学及工艺—金属表面处理]