Effects Ti/TiAlN composite multilayer coatings on corrosion resistance of titanium alloy in solid NaCl-H2O-O-2 at 600 degrees C

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	Effects Ti/TiAlN composite multilayer coatings on corrosion resistance of titanium alloy in solid NaCl-H2O-O-2 at 600 degrees C
	Zhang, MM; Xin, L; Ding, XY; Zhu, SL; Wang, FH; Xin, L (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang, Liaoning, Peoples R China.
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-02-15
卷号	734 页码:307-317
关键词	Nacl Deposit Oxidation Resistance High-temperature Ti60 Alloy Ti-6al-4v Alloy Water-vapor Behavior Tin Ti6al4v Microstructure
ISSN号	0925-8388
英文摘要	This paper investigates corrosion resistance of Ti-6Al-4V coated by Ti/TiAlN composite multilayer coatings with different Ti layer thicknesses in presence of solid NaCl, H2O and O-2 at 600 degrees C. Effects of TiAlN single layer coatings with different thicknesses on the corrosion resistance of Ti-6Al-4V were also studied for comparison. The results showed that the thick TiAlN single layer coating and the Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.15 mm exhibited good corrosion resistance in the above environment, while localized accelerated corrosion of substrate occurred for thin TiAlN single layer coating and Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.3 mm coated specimens. It is proposed that improvement of corrosion resistance of titanium alloy by application of TiAlN single layer coating and Ti/TiAlN composite multilayer coating is attributed to suppression of active corrosion induced by gaseous metal chloride, hydrochloric acid and chlorine in the corrosion process. Accelerated local corrosion of thin TiAlN single layer coated specimen is related to existence of intrinsic through-coating defects such as pinholes in the coating. For the Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.3 mm, volume expansion caused by oxidation of Ti in sublayers to TiO2 when corrosive media diffused into along through-layer defects in top TiAlN layer led to bending and cracking of the sublayers of the composite multilayer coating and eventually accelerated local corrosion of the coating and substrate. (C) 2017 Elsevier B.V. All rights reserved.; This paper investigates corrosion resistance of Ti-6Al-4V coated by Ti/TiAlN composite multilayer coatings with different Ti layer thicknesses in presence of solid NaCl, H2O and O-2 at 600 degrees C. Effects of TiAlN single layer coatings with different thicknesses on the corrosion resistance of Ti-6Al-4V were also studied for comparison. The results showed that the thick TiAlN single layer coating and the Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.15 mm exhibited good corrosion resistance in the above environment, while localized accelerated corrosion of substrate occurred for thin TiAlN single layer coating and Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.3 mm coated specimens. It is proposed that improvement of corrosion resistance of titanium alloy by application of TiAlN single layer coating and Ti/TiAlN composite multilayer coating is attributed to suppression of active corrosion induced by gaseous metal chloride, hydrochloric acid and chlorine in the corrosion process. Accelerated local corrosion of thin TiAlN single layer coated specimen is related to existence of intrinsic through-coating defects such as pinholes in the coating. For the Ti/TiAlN composite multilayer coating with Ti layer thickness of 0.3 mm, volume expansion caused by oxidation of Ti in sublayers to TiO2 when corrosive media diffused into along through-layer defects in top TiAlN layer led to bending and cracking of the sublayers of the composite multilayer coating and eventually accelerated local corrosion of the coating and substrate. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [U1537107]; National Key Research and Development Program of China [2017YFB0603801]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79501]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xin, L (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, MM,Xin, L,Ding, XY,et al. Effects Ti/TiAlN composite multilayer coatings on corrosion resistance of titanium alloy in solid NaCl-H2O-O-2 at 600 degrees C[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,734:307-317.
APA	Zhang, MM,Xin, L,Ding, XY,Zhu, SL,Wang, FH,&Xin, L .(2018).Effects Ti/TiAlN composite multilayer coatings on corrosion resistance of titanium alloy in solid NaCl-H2O-O-2 at 600 degrees C.JOURNAL OF ALLOYS AND COMPOUNDS,734,307-317.
MLA	Zhang, MM,et al."Effects Ti/TiAlN composite multilayer coatings on corrosion resistance of titanium alloy in solid NaCl-H2O-O-2 at 600 degrees C".JOURNAL OF ALLOYS AND COMPOUNDS 734(2018):307-317.