Corrosion Resistance of Alternately Multilayered Coating Ti/TiAlN on Ti-alloy Ti-6Al-4V Beneath a Solid NaCl Film in Atmosphere of Water Vapor and Oxygen at 600 ℃

doi:10.11902/1005.4537.2016.148

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (1): 29-35 DOI: 10.11902/1005.4537.2016.148

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Corrosion Resistance of Alternately Multilayered Coating Ti/TiAlN on Ti-alloy Ti-6Al-4V Beneath a Solid NaCl Film in Atmosphere of Water Vapor and Oxygen at 600 ℃

Mingming ZHANG^1,²,Li XIN²(

),Xueyong DING¹,Shujiang GENG¹,Shenglong ZHU²,Fuhui WANG³

1 School of Metallurgy, Northeastern University, Shenyang 110819, China
2 Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Abstract

An alternately multilayered coating Ti/TiAlN and a coating of single layer TiAlN were respectively deposited on Ti- alloy Ti-6Al-4V by arc ion plating. Corrosion resistance of the alloy Ti-6Al-4V with the two coatings covered with a solid NaCl film was comparatively investigated in flowing atmosphere of water vapor and oxygen at 600 ^oC. The results show that the coating of single layer TiAlN exhibits columnar structure, which may contains some intrinsic defects such as pinholes acting as short-circuit diffusion paths for the inwards migration of corrosive species. On the other hand, the direct connection of the above mentioned short-circuit diffusion paths located in any two nearest neighbour TiN layers may be disturbed due to the intercalation of Ti layers for the Ti/TiAlN multilayer coatings, thus being beneficial to the corrosion resistance of the coating. In fact, the coating of single layer TiN showed clearly characteristics of localized corrosion induced by NaCl in flowing atmosphere of H₂O and O₂, while the coating of multilayered Ti/TiAlN kept intact. In general, the corrosion resistance of the multilayered Ti/TiAlN coating was much better than that of the single layer TiAlN coating.

Key words: arc ion plating multilayer Ti/TiAlN coating NaCl-H₂O-O₂ High temperature corrosion

Received: 09 September 2016

Fund: Supported by National Natural Science Foundation of China (U1537107) and National Basic Research Program of China (2012CB625100)

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	Mingming ZHANG
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	Xueyong DING
	Shujiang GENG
	Shenglong ZHU
	Fuhui WANG

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Mingming ZHANG,Li XIN,Xueyong DING,Shujiang GENG,Shenglong ZHU,Fuhui WANG. Corrosion Resistance of Alternately Multilayered Coating Ti/TiAlN on Ti-alloy Ti-6Al-4V Beneath a Solid NaCl Film in Atmosphere of Water Vapor and Oxygen at 600 ℃. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 29-35.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.148 OR https://www.jcscp.org/EN/Y2017/V37/I1/29

Fig.1 Schematic diagram of apparatus for synergistic corrosion under solid NaCl, water vapor and oxygen

Fig.2 SEM cross-sectional images (a, c) and fracture morphologies (b, d) of as-prepared single layerTiAlN coating (a, b) and multilayer Ti/TiAlN coating (c, d)

Fig.3 XRD spectrum of as-prepared single layer TiAlNand multilayer Ti/TiAlN coatings

Fig.4 Corrosion kinetic curves of single layer TiAlN and multilayer Ti/TiAlN coatings at 600 ℃ in the presence of solid NaCl, water vapor and oxygen

Fig.5 SEM images of single layer TiAlN coating (a~d) corroded for 100 h and multilayer Ti/TiAlN coating corroded for 200 h (e, f) in the presence of solid NaCl, water vapor and oxygen at 600 ℃

Fig.6 Cross-sectional EDS analysis for products of single layer TiAlN coating after corrosion for 100 h (a) and multilayer Ti/TiAlN coating for 200 h (b) after corrosion in the presence of solid NaCl, water vapor and oxygen at 600 ℃

Fig.7 XRD patterns of single layer TiAlN coating after corrosion for 100 h and multilayer Ti/TiAlN coating after corrosion for 200 h at 600 ℃

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