High-temperature Corrosion Behavior of Laser Additive Manufacturing of Ni-Cr-Mo Alloy in KCl-K2SO4 Mixed Salt

doi:10.11902/1005.4537.2025.254

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (4): 1207-1217 DOI: 10.11902/1005.4537.2025.254

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High-temperature Corrosion Behavior of Laser Additive Manufacturing of Ni-Cr-Mo Alloy in KCl-K₂SO₄ Mixed Salt

KONG Yao, HUANG Yixin, ZHOU Mulan, ZENG Guang, NING Huaqing, SHEN Yue, LIU Zongde(

)

College of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Cite this article:

KONG Yao, HUANG Yixin, ZHOU Mulan, ZENG Guang, NING Huaqing, SHEN Yue, LIU Zongde. High-temperature Corrosion Behavior of Laser Additive Manufacturing of Ni-Cr-Mo Alloy in KCl-K₂SO₄ Mixed Salt. Journal of Chinese Society for Corrosion and protection, 2026, 46(4): 1207-1217.

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Abstract

The corrosion experiment was conducted on the laser additive manufacturing of Ni-Cr-Mo alloy and TP347H stainless steel under simulated conditions of biomass deposition salt (KCl-K₂SO₄) co-firing in a coal-fired boiler at 600 ℃ for 168 h. The corrosion kinetics curves were obtained, and the microstructure, phase composition, and composition of the corrosion products were analyzed using scanning electron microscopy energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD). The results indicate that laser additive manufacturing of Ni-Cr-Mo alloy exhibits superior corrosion resistance compared to stainless steel. The corrosion behavior mainly manifests as oxidative corrosion, activated oxidative corrosion, and alkaline melting mechanism. With the increase of K₂SO₄ content in the mixed salt, the corrosion degree of the alloy intensifies. The surface of the cladding layer forms a dense protective oxide layer, mainly composed of Cr₂O₃ and NiO, which effectively hinders the penetration of corrosive media. However, the activation oxidation corrosion process causes pores and cracks in the surface oxide layer, promoting the inward diffusion of the corrosive medium and intensifying the internal sulfurization reaction.

Key words: laser additive manufacturing of Ni-Cr-Mo alloy coal-fired boiler mixed with biomass high-temperature corrosion

Received: 07 August 2025 32134.14.1005.4537.2025.254

ZTFLH:

TG178

Fund: China Equipment Pre-research Joint Fund of the Ministry of Education for Young Talents Project

Corresponding Authors: LIU Zongde, E-mail: lzd@ncepu.edu.cn

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	KONG Yao
	HUANG Yixin
	ZHOU Mulan
	ZENG Guang
	NING Huaqing
	SHEN Yue
	LIU Zongde

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.254 OR https://www.jcscp.org/EN/Y2026/V46/I4/1207

Table 1 Chemical composition of TP347H stainless steel and Ni-Cr-Mo alloy powder

Fig.1 Macroscopic morphologies of laser additively manufactured Ni-Cr-Mo alloy (a) and TP347H stainless steel (b) after corrosion in mixed salt at 600 ℃ for 24 h (a1, b1), 72 h (a2, b2), 120 h (a3, b3) and 168 h (a4, b4)

Fig.2 Change in mass loss of laser additively manufactured Ni-Cr-Mo alloy and TP347H stainless steel after corrosion at 600 ℃

Fig.3 XRD patterns of laser additive manufacturing Ni-Cr-Mo alloy and TP347H stainless steel after corrosion in mixed salt at 600 ℃ for 168 h

Fig.4 Surface morphologies of different zones of laser additively manufactured Ni-Cr-Mo alloy (a-d) after corrosion in mixed salt at 600 ℃ for 168 h

Fig.5 Surface morphology and element mapping of laser additively manufactured Ni-Cr-Mo alloy after corrosion in mixed salts at 600 ℃ for 168 h

Fig.6 Surface morphologies of different zones of TP347H stainless steel (a-c) after corrosion in mixed salts at 600 ℃ for 168 h

Fig.7 Surface morphology and element mapping of TP347H stainless steel after corrosion at 600 ℃ for 168 h

Fig.8 Cross section morphologies of laser additively manufactured Ni-Cr-Mo alloy (a, b) and TP347H (c, d) after corrosion for 168 h at 600 ℃

Fig.9 XRD patterns of laser additively manufactured Ni-Cr-Mo alloy after corrosion in mixed salt with different proportions at 600 ℃ for 168 h

Fig.10 Surface morphology of laser additively manufactured of Ni-Cr-Mo alloy in mixed salt of K₂SO₄:KCl = 1:9 (a-c), 1:3 (d-f) after corrosion for 168 h at 600 ℃

Fig.11 Surface morphology and elements mapping of laser additively manufactured Ni-Cr-Mo alloy after corrosion in mixed salt with K₂SO₄:KCl = 1:9 at 600 ℃ for 168 h

Fig.12 Corrosion damage mechanism of laser additively manufactured Ni-Cr-Mo alloy in KCl-K₂SO₄ mixed salt at 600 ℃

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