基体温度对等离子喷涂铁基非晶合金涂层耐磨耐蚀性的影响  

Effect of Substrate Temperature on Wear and Corrosion Resistance of Plasma Sprayed Iron-based Amorphous Coatings

作　　者：王红哲 杨德明 赵中杰 高伟强 李正旭 WANG Hongzhe;YANG Deming;ZHAO Zhongjie;GAO Weiqiang;LI Zhengxu(College of Transportation Engineering,Dalian Maritime University,Liaoning Dalian 116026,China)

机构地区：[1]大连海事大学交通运输工程学院,辽宁大连116026

出　　处：《表面技术》2024年第19期201-211,共11页Surface Technology

基　　金：国家重点研发计划(2022YFB4002102)。

摘　　要：目的探究基体温度对铁基非晶涂层耐磨及耐蚀性的影响。方法采用大气等离子喷涂技术,在3种不同基体温度(平均约为90、380、650℃)条件下制备铁基非晶涂层,分析非晶粉末颗粒的铺展形貌,研究基体温度对涂层的非晶含量、氧化程度、显微硬度、孔隙率及相组成的影响,并分析3种涂层在载荷3、5、9 N下的摩擦学性能,以及在质量分数3.5%的氯化钠溶液中的电化学性能。结果随着基体温度的提高,涂层的氧化程度逐渐加大,非晶含量逐渐下降,显微硬度先上升后下降,在380℃时达到最大值。受到非晶粉末颗粒在不同温度基体上铺展形貌的影响,涂层的孔隙率随着基体温度的提高呈先上升后下降的趋势,液滴在基体上延展得越剧烈,涂层的孔隙率越高。在380℃下制备的非晶含量为86.7%的涂层具有最小的孔隙率(0.64%)和最高的显微硬度(1001.46HV0.3),且在载荷3、5、9 N下的比磨损率最低,主要原因是基体温度降低了非晶含量,同时降低了孔隙率,提高了显微硬度,细晶强化增强了涂层的耐磨性。在380℃时涂层在氯化钠溶液(3.5%)中也表现出最低的自腐蚀电流密度(Jcorr=3.39×10^(-6)A/cm^(2)),其原因为低孔隙率的涂层在腐蚀过程中不易为腐蚀介质提供侵蚀通道,遏制了点蚀的发生。结论相较于较低或较高的基体温度,在适中的基体温度(380℃左右)下制备的涂层具有更好的耐磨性能及耐腐蚀性能,这为制备高性能的非晶涂层提供了理论依据。The work aims to investigate the effect of substrate temperature on the wear and corrosion resistance of iron-based amorphous coatings.The iron-based amorphous coatings were prepared on FeCrAl substrate by atmospheric plasma spraying at three different substrate temperatures(averaging about 90,380,and 650℃),and the spreading morphology of amorphous powder particles at different substrate temperatures was analyzed to investigate the effects of substrate temperature on the amorphous content,oxidation,microhardness,porosity,and phase compositions of the coatings.Then,the tribological properties and the wear and corrosion resistance of the coatings were analyzed under dry sliding conditions of 3,5,and 9 N loads in 3.0%NaCl solution.The friction mechanism was analyzed and the electrochemical properties of the coatings in 3.5%sodium chloride solution and the corrosion mechanism were investigated.When the substrate temperature was 90℃,the splash pattern of amorphous powder particles on the substrate extension was more intense,the coatings at this temperature had the highest amorphous content and the lowest degree of oxidation.When the substrate temperature increased to 380℃,the particle splash pattern was round,and at this time,the porosity of the coatings was reduced from 1.54%by 0.64%,the coating of the degree of oxidation increased,the microhardness reached the maximum of 1001.46HV0.3.When the substrate temperature increased to 650℃,the particle spattering morphology changed from disc shape to ellipse shape,the branches at the edge of the particles became thicker and longer,the oxidation degree of the coatings was the most serious,the porosity of the coatings increased to 0.89%,and the microhardness decreased to 940HV0.3.In terms of wear resistance,the coating with 86.7%amorphous content prepared at 380℃had the smallest porosity,the highest microhardness and the lowest specific wear rate under 3,5 and 9 N load,and the degree of spalling was small,mainly because the substrate temperature reduced the amorphou

关 键 词：大气等离子喷涂 非晶涂层 基体温度 铺展形貌 耐磨 耐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]