K452合金表面CVD渗铝涂层制备温度对其750℃硫酸盐热腐蚀行为的影响  

Effect of Coating Process Temperatures on Hot Corrosion Behavior Induced by Deposit of Sulfates Salts in Air at 750℃ for CVD Aluminized Coatings on K452 Superalloy

作　　者：徐佳新 耿树江[1] 王金龙[1] 王福会[1] 孙清云 吴勇 夏思瑶 XU Jiaxin;GENG Shujiang;WANG Jinlong;WANG Fuhui;SUN Qingyun;WU Yong;XIA Siyao(Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China;China Academy of Machinery Wuhan Research Institute of Materials Protection Co.,Ltd.,Wuhan 430030,China)

机构地区：[1]东北大学、沈阳材料科学国家研究中心东北大学联合研究分部,沈阳110819 [2]中国机械总院集团武汉材料保护研究所有限公司,武汉430030

出　　处：《中国腐蚀与防护学报》2024年第3期612-622,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2020YFB2010400);湖北省重点研发计划(2021BAA210)。

摘　　要：采用化学气相沉积(CVD)技术在K452合金表面沉积渗铝涂层,沉积温度分别为850、950和1050℃。研究了沉积温度对CVD渗铝涂层在750℃空气中表面沉积Na_(2)SO_(4)及Na_(2)SO_(4)+NaCl环境下热腐蚀行为的影响。采用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)对腐蚀前和后的试样进行截面形貌观察和物相结构分析。结果表明,在750℃下表面沉积Na_(2)SO_(4)及Na_(2)SO_(4)+NaCl热腐蚀50 h后,3种涂层试样均表现出了较K452合金更好的抗热腐蚀性能,且涂层的抗热腐蚀性能随着涂层沉积温度的增加而增强。Aluminized coatings were deposited on K452 superalloy by chemical vapor deposition(CVD)technique at the temperatures 850,950 and 1050℃,respectively.The effect of deposition temperature on the corrosion behavior of K452 alloys without and with CVD aluminized coatings was comparatively investigated beneath deposits of Na_(2)SO_(4)and Na_(2)SO_(4)+NaCl(3±0.2 mg/cm^(2)),respectively in air at 750℃.Then their cross-sectional morphologies and phase structures were characterized by SEM/EDS and XRD.The results showed that all the aluminized coatings exhibited better corrosion resistance to the deposits of Na_(2)SO_(4)and Na_(2)SO_(4)+NaCl as compared to the bare K452 alloy after 50 h of corrosion.Notably,the corrosion resistance of the coatings was increased with the increase in deposition temperatures.

关 键 词：CVD渗铝涂层 沉积温度 Na_(2)SO_(4)腐蚀 Na_(2)SO_(4)+NaCl腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]