Hot Corrosion Behavior of Pt Modified Gradient NiCrAlY Coatings

SUN Ri, WANG Tiegang, LI Wei, YIN Shuang, LIU Yanmei, JIANG Sumeng

doi:10.16577/j.issn.1001-1560.2024.0053

Materials Protection >

2024 , Vol. 57 >Issue 3: 28 - 37

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0053

Hot Corrosion Behavior of Pt Modified Gradient NiCrAlY Coatings

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(1. Tianjin Key Laboratory of High Speed Cutting and Precision Manufacturing,
Tianjin University of Technology and Education, Tianjin 300222, China;
2. Division of Surface Engineering of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)

WANG Tiegang (1978-), Ph.D., Professor, Research Focus: Tool Coatings and High Temperature Protective Coatings, Tel.: 18812501525, E-mail: tgwang@tute.edu.cn;

JIANG Sumeng(1980-), Ph.D., Researcher, Research Focus: High Temperature Protective Coatings, Tel.: 13624012375, E-mail: smjiang@imr.ac.cn

Received date: 2023-10-10

Revised date: 2023-11-07

Accepted date: 2023-12-07

Online published: 2024-03-19

Supported by

Liaoning Doctoral Research Startup Fund (2022-BS-004); Major Project of Tianjin Diversified Investment Fund (22JCZDJC00670)

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Abstract

For further enhancing the hot corrosion resistance of the NiCrAlY coating, the NiCrAlY/NiAl/Al coating(coating A) and the NiCrAlY/Pt/NiAl/Al coating(coating B) were deposited on the surface of DZ125 alloy by arc ion plating technology, and then the gradient coating structure with gradually changing composition was formed by vacuum diffusion annealing. The modified element Pt was introduced into the coating to enhance the hot corrosion resistance of the coating, and the hot corrosion behavior of two coating systems in different mixed salts at 900 ℃ was studied. Additionally, the microstructure, phase composition and element distribution of the coating after hot corrosion were analyzed by SEM, EDS, XRD and EPMA. Results showed in a mixed salt of K₂SO₄ + Na₂SO₄ at 900 ℃, the extensive spalling of the oxide film occurred on the surface of coating A. Pt in coating B inhibited the segregation of S at the coating/oxide film interface, and enhanced the adhesion of the oxide film. In the mixed salt of NaCl + Na₂SO₄ at 900 ℃, the Cr element and O element of coating A underwent outward diffusion and inward diffusion, respectively. The outward diffusion of Cr was easy to react with S to form a harmful phase Cr_xS_y. In contrast, the Pt in coating B inhibited the outward diffusion and inward diffusion of Cr and O elements. Overall, the addition of Pt layer between NiCrAlY and NiAl layers significantly enhanced the hot corrosion resistance of the NiCrAlY coating in mixed salts.

Key words： arc ion plating; gradient NiCrAlY coating; α-Cr; Pt modified; hot corrosion

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SUN Ri, WANG Tiegang, LI Wei, YIN Shuang, LIU Yanmei, JIANG Sumeng . Hot Corrosion Behavior of Pt Modified Gradient NiCrAlY Coatings[J]. Materials Protection, 2024 , 57(3) : 28 -37 . DOI: 10.16577/j.issn.1001-1560.2024.0053

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