HOT CORROSION RESISTANCE OF Cr1-xAlxN COATINGS ON A Ti3Al BASED ALLOY IN DEPOSITED (Na2SO4+K2SO4) MOLTEN SALT AT 800 ℃

J Chin Soc Corr Pro

2009, Vol. 29

Issue (4): 306-311 DOI:

技术报告

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HOT CORROSION RESISTANCE OF Cr_1-xAl_xN COATINGS ON A Ti₃Al BASED ALLOY IN DEPOSITED (Na₂SO₄+K₂SO₄) MOLTEN SALT AT 800 ℃

ZHU Ming^1;2; LI Meishuan¹; ZHOU Yanchun¹

1. Shenyang National Laboratory for Materials Science; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2. College of Materials Science and Engineering; Xi’an University of Science and Technology; Xi’an 710054

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Abstract

Cr_0.82Al_0.18N and Cr_0.53Al_0.47N coatings were deposited on a Ti₃Al based alloy by reactive magnetron sputtering method. Hot corrosion of these two coatings in 75 mass % Na₂SO₄+25 mass % K₂SO₄ molten salt at 800 ℃ was performed in a Setsys 16/18 thermoanalyzer. The phase compositions of the corrosion products were identified by X-ray diffractometer (XRD). Both the surface and cross-sectional morphologies of the samples were observed by a scanning electron microscope (SEM). The results showed that both Cr_0.82Al_0.18N and Cr_0.53Al_0.47N can reduce the hot corrosion rate of the Ti₃Al based alloy and their hot corrosion resistance decreases with increasing aluminum content; the main corrosion products of the coatings are Cr₂O₃and θ-Al₂O₃ and the amount of θ-Al₂O₃ in the corrosion products is proportional to the Al content in the coating. The better hot corrosion resistance of Cr_0.82Al_0.18N coating can attribute to the high stability of Cr₂O₃ in the molten salt.

Key words: Cr_1-xAl_xNcoatings Hot corrosion Ti₃Al based alloy

Received: 15 December 2008

ZTFLH:

TG172.62

Corresponding Authors: LI Meishuan E-mail: mshli@imr.ac.cn

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ZHU Ming LI Meishuan ZHOU Yanchun. HOT CORROSION RESISTANCE OF Cr_1-xAl_xN COATINGS ON A Ti₃Al BASED ALLOY IN DEPOSITED (Na₂SO₄+K₂SO₄) MOLTEN SALT AT 800 ℃. J Chin Soc Corr Pro, 2009, 29(4): 306-311.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I4/306

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