镍石墨涂层酸性盐雾腐蚀后的组织结构与性能转变  

Microstructure and Properties Transformation of Ni-C Coatings after Acid Salt Spray Corrosion

作　　者：房永超 李姝 刘振 解维涛 李彰 王森源 王长亮 田浩亮 FANG Yongchao;LI Shu;LIU Zhen;LI Zhang;XIE Weitao;WANG Senyuan;WANG Changliang;TIAN Haoliang(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China;China Aero-Engine Sichuan Gas Turbine Research Institute,Chengdu 610500,China;The Ninth Oil Production Plant of China Petroleum Changqing Oilfield Company,Yan′an 717600,China)

机构地区：[1]中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点试验室,北京100095 [2]中国航发四川燃气涡轮研究院,成都610500 [3]中国石油长庆油田分公司第九采油厂,陕西延安717600

出　　处：《有色金属工程》2024年第7期24-32,共9页Nonferrous Metals Engineering

基　　金：国家重点研发计划项目(2021YFB3702004);国家科技重大专项(2017-VII-0012-0109);国家自然科学基金资助项目(52075508,52305224);中国航空发动机集团创新平台项目(CXPT-2023-028)。

摘　　要：采用热喷涂制备镍石墨(Ni-C)可磨耗封严涂层,并进行酸性盐雾192 h腐蚀。对酸性盐雾腐蚀前后涂层的组织结构、硬度、结合强度与可磨耗性能评价。结果表明:酸性盐雾腐蚀192 h后Ni-C涂层表面形成厚度约为200~300μm腐蚀区域,平均硬度由(34.4±3.2)HR15Y提升至(41.1±2.4)HR15Y,平均结合强度由(14.6±0.7)MPa下降到(13.3±0.6)MPa。这主要是由于酸性盐雾腐蚀过程中腐蚀区域内石墨等软质材料出现流失,导致了涂层的表面硬度出现增高趋势。同时,涂层腐蚀区域与下部未腐蚀区域的结合性较差,造成结合强度出现降低,且在可磨耗刮削过程中硬化的腐蚀层易发生剥落,避免对偶叶片因涂层硬度升高而磨损加剧。涂层的整体磨损机制并未发生明显转变,仍为塑性变形与黏着态磨损的混合磨损机制。Ni-C abradable seal coatings were prepared by thermal spraying,and subjected to acid salt spray corrosion treatment for 192 hours.The microstructure,hardness,bonding strength,and abradability of Ni-C coatings before and after acid salt spray corrosion were explored.The research results indicate that the corrosion zone with thickness of 200—300μm is formed on the top of Ni-C coatings after acidic salt spray corrosion.The average hardness of Ni-C coatings increases from(34.4±3.2)HR15Y to(41.1±2.4)HR15Y,and the average bonding strength of Ni-C coatings decreases from(14.6±0.7)MPa to(13.3±0.6)MPa.This is mainly due to the loss of soft materials such as graphite on the surface during the acidic salt spray corrosion,which leads to an increase in the surface average hardness.The poor bonding strength between the corrosion zone and uncorroded coating results in a decrease in bonding strength.The hardened corrosion layer is prone to peeling off during the wear-resistant scraping process,avoiding aggravating wear of dual blades due to the increased hardness of coating.The wear mechanism of the Ni-C coatings has not undergo significant change,remaining a mixed wear mechanism of plastic deformation and adhesive wear.

关 键 词：热喷涂 封严涂层 可磨耗性能 刮削 

分 类 号：TG174[金属学及工艺—金属表面处理]