盐雾-高温交替环境下NiCrAlY涂层的腐蚀行为

V259%TG174.4; 海洋环境服役的航空发动机在频繁启停过程中面临严重的常温盐雾-高温氧化交替引起的腐蚀问题.采用直流磁控溅射技术在GH4169高温合金表面制备一层均匀致密的Ni25Cr5AlY涂层,通过设计 1000℃高温氧化、常温盐雾和常温盐雾-高温氧化交替的实验环境,利用X射线衍射(XRD)和扫描电子显微镜(SEM)分析腐蚀产物的成分和结构,对NiCrAlY高温防护涂层的腐蚀损伤行为开展研究.结果表明:在进行 168 h的高温氧化实验后,Ni25Cr5AlY涂层表面生长了一层连续致密的Al2O3 膜,抗氧化性能良好;在进行 168 h的常温盐雾实验后,涂层表面因局部形成点蚀坑而变得...

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Published in航空材料学报 Vol. 44; no. 6; pp. 53 - 60
Main Authors 丁航, 吴旭东, 黄婷, 辛丽坡, 付勇, 谢云
Format Journal Article
LanguageChinese
Published 南昌航空大学材料科学与工程学院,南昌 330063%中国航发贵州黎阳航空动力有限公司,贵阳 550014 01.12.2024
Subjects
ambient salt spray-high temperature oxidation alternation
海洋环境
marine environment
NiCrAlY涂层
盐雾腐蚀
high temperature oxidation
高温氧化
常温盐雾-高温氧化交替
NiCrAlY coatings
salt spray corrosion
Online AccessGet full text
ISSN1005-5053
DOI10.11868/j.issn.1005-5053.2024.000103

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Abstract V259%TG174.4; 海洋环境服役的航空发动机在频繁启停过程中面临严重的常温盐雾-高温氧化交替引起的腐蚀问题.采用直流磁控溅射技术在GH4169高温合金表面制备一层均匀致密的Ni25Cr5AlY涂层,通过设计 1000℃高温氧化、常温盐雾和常温盐雾-高温氧化交替的实验环境,利用X射线衍射(XRD)和扫描电子显微镜(SEM)分析腐蚀产物的成分和结构,对NiCrAlY高温防护涂层的腐蚀损伤行为开展研究.结果表明:在进行 168 h的高温氧化实验后,Ni25Cr5AlY涂层表面生长了一层连续致密的Al2O3 膜,抗氧化性能良好;在进行 168 h的常温盐雾实验后,涂层表面因局部形成点蚀坑而变得粗糙不平;在进行 168 h的常温盐雾-高温氧化交替实验后,涂层因氯的活性氧化腐蚀机制导致表面Al2O3 膜发生降解生长Cr2O3 膜,氧化膜疏松多孔且局部开裂导致涂层腐蚀损伤加速,涂层和基体发生内氧化;没有涂层保护的GH4169合金在经历相同的交替实验后则发生严重的腐蚀损伤,表面形成保护性较差的NiO膜,合金发生严重的内氧化,腐蚀产物大量剥落而显著减重.
AbstractList V259%TG174.4; 海洋环境服役的航空发动机在频繁启停过程中面临严重的常温盐雾-高温氧化交替引起的腐蚀问题.采用直流磁控溅射技术在GH4169高温合金表面制备一层均匀致密的Ni25Cr5AlY涂层,通过设计 1000℃高温氧化、常温盐雾和常温盐雾-高温氧化交替的实验环境,利用X射线衍射(XRD)和扫描电子显微镜(SEM)分析腐蚀产物的成分和结构,对NiCrAlY高温防护涂层的腐蚀损伤行为开展研究.结果表明:在进行 168 h的高温氧化实验后,Ni25Cr5AlY涂层表面生长了一层连续致密的Al2O3 膜,抗氧化性能良好;在进行 168 h的常温盐雾实验后,涂层表面因局部形成点蚀坑而变得粗糙不平;在进行 168 h的常温盐雾-高温氧化交替实验后,涂层因氯的活性氧化腐蚀机制导致表面Al2O3 膜发生降解生长Cr2O3 膜,氧化膜疏松多孔且局部开裂导致涂层腐蚀损伤加速,涂层和基体发生内氧化;没有涂层保护的GH4169合金在经历相同的交替实验后则发生严重的腐蚀损伤,表面形成保护性较差的NiO膜,合金发生严重的内氧化,腐蚀产物大量剥落而显著减重.
Abstract_FL Corrosion problem resulting from alternating ambient salt spray and high temperature oxidation poses a great threat to the safe service of aircraft engine during frequent start-stop in marine environment.In the present study,Ni25Cr5AlY coating is prepared on top of GH4169 superalloy substrate by direct-current(DC)magnetron sputtering.Corrosion behavior of the Ni25Cr5AlY coating is systematically studied by designing three different test conditions:high temperature oxidation at 1000℃,ambient salt spray,and alternating ambient salt spray and high temperature oxidation.The phase constitution and morphology of the corrosion products are analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results indicate that after 168 h oxidation at 1000℃,the coating forms a dense and continuous Al2O3 scale which resists well against the oxidizing environment,while the coating suffers from pitting locally after 168 h salt spray test.After 168 h exposure to alternating ambient salt spray and high temperature oxidation test,the Al2O3 scale formed on the coating is damaged owing to the chlorine induced active oxidation mechanism,eventually resulting in Cr2O3 scale formation.In addition,the Cr2O3 scale is porous and cracks locally,which causes accelerated corrosion of the coating and internal oxidation of the coating and substrate.The corrosion degradation of the coating is accelerated under the synergistic effect of salt spray and high temperature oxidation.The GH4169 superalloy without the coating experiences severe scale spallation after 168 h exposure to the alternating test,featured by forming a poorly protective NiO scale with prevalent internal oxidation.
Author 丁航
黄婷
吴旭东
辛丽坡
付勇
谢云
AuthorAffiliation 南昌航空大学材料科学与工程学院,南昌 330063%中国航发贵州黎阳航空动力有限公司,贵阳 550014
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Author_FL XIN Lipo
DING Hang
WU Xudong
HUANG Ting
XIE Yun
FU Yong
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DocumentTitle_FL Corrosion behavior of NiCrAlY coatings under alternating salt spray and high temperature environment
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Keywords ambient salt spray-high temperature oxidation alternation
海洋环境
marine environment
NiCrAlY涂层
盐雾腐蚀
high temperature oxidation
高温氧化
常温盐雾-高温氧化交替
NiCrAlY coatings
salt spray corrosion
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PublicationTitle 航空材料学报
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PublicationYear 2024
Publisher 南昌航空大学材料科学与工程学院,南昌 330063%中国航发贵州黎阳航空动力有限公司,贵阳 550014
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Title 盐雾-高温交替环境下NiCrAlY涂层的腐蚀行为
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