摘要
氯化物腐蚀和粉尘固体颗粒冲刷是造成垃圾焚烧余热锅炉热交换部件失效的主要因素。本文采用HVOF/HVAF工艺制备镍基合金涂层,对其进行高温冲蚀及熔盐腐蚀试验,研究热喷涂涂层的耐腐蚀和冲蚀性能。结果表明：HVOF制备Ni Cr-Cr3C2涂层组织疏松,涂层孔隙率为5.93%±0.41%,显微硬度为（820±53）HV0.3。HVAF制备Inconel 625涂层组织致密,涂层孔隙率为0.65%±0.41%,显微硬度为（516±30）HV0.3。Ni Cr-Cr3C2涂层550℃,冲蚀角30°、60°和90°下涂层的冲蚀速率分别为3.20、7.19、5.32 mg/g。Inconel 625涂层550℃,冲蚀角30°、60°和90°下涂层的冲蚀速率分别为3.67、6.92、4.84 mg/g。Ni Cr-Cr3C2涂层熔盐腐蚀速率为Inconel 625涂层的2倍。
Chloride corrosion and solid particle erosion are the main failure reasons for heat transfer components of waste incineration boiler nickel based coatings were prepared by HVOF and HVAF,respectively.Molten salt corrosion test and high temperature erosion test were carried out to investigate the corrosion and erosion resistance performance of the coatings.The results show that the microstructure of Ni CrCr3C2coating prepared by HVOF is loose,the porosity is 5.93%±0.41%and the microhardness is（820±53）HV0.3.The Inconel 625coating prepared by HVAF has very dense microstructure,low porosity（0.65%±0.41%）and the microhardness is（516±30）HV0.3.The erosion rates of Ni Cr-Cr3C2coating are 3.20,7.19 and 5.32 mg/g at 30°,60°and 90°erosion angle under 550℃erosion temperature,respectively.The erosion rates of Inconel 625 coating are 3.67,6.92 and 4.84 mg/g at 30°,60°and 90°erosion angle under550℃erosion temperature,respectively.The molten salt corrosion rate of Ni Cr-Cr3C2coating is twice higher than that of the rate of Inconel625 coating.
作者
杨二娟
李太江
李巍
李勇
刘刚
Yang Erjuan;Li Taijiang;Li Wei;Li Yong;Liu Gang(Xi＇an Thermal Power Research Institute Co.,Ltd.,Xi＇an Shaanxi 710054,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第7期209-214,共6页
Heat Treatment of Metals
基金
西安热工研究院有限公司自立科技项目(TN-16-TYK01,TN-16-TYK02)
