Effect of Nb Addition on Formability and Corrosion Resistance of Build-up Welding Overlays of a Nickel-based Alloy

doi:10.11902/1005.4537.2025.168

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 903-910 DOI: 10.11902/1005.4537.2025.168

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Effect of Nb Addition on Formability and Corrosion Resistance of Build-up Welding Overlays of a Nickel-based Alloy

LAN Zhiliang, BAI Lingyun, XIAO Botao, XIANG Junhuai(

)

Jiangxi Provincial Key Laboratory of Materials Surface Engineering, School of Materials and Energy, Jiangxi Science and Technology Normal University, Nanchang 330013, China

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LAN Zhiliang, BAI Lingyun, XIAO Botao, XIANG Junhuai. Effect of Nb Addition on Formability and Corrosion Resistance of Build-up Welding Overlays of a Nickel-based Alloy. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 903-910.

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Abstract

Two build-up welding overlays of NiCrMo-xNb alloys (x = 0/3.6%, mass fraction) were fabricated on 12CrMoVG steel substrate via welding technique with NiCrMo-based alloy wires with and without 3.6%Nb addition as filler material. Then, their microstructure, and corrosion behavior at 800 ℃ in a mixed gas atmosphere N₂-CO₂(29.8 mg/L)-O₂(23.4 mg/L)-HCl (3.53 mg/L) were also assessed, the later issue aims to simulate the corrosive atmosphere of municipal solid waste (MSW) incinerators. The assessment focuses on the effect of Nb addition on local alloy parameters related to formation of the overlay layer such as microstructure, melting point, fluidity, as well as corrosion resistance of the nickel-based build-up welding overlay layers. The results demonstrate that the addition of Nb can lower the alloy's melting point, refine the grain structure, and improve the fluidity of molten alloy. However, the Nb-free alloy overlay layer exhibited superior corrosion resistance. The corrosion mass gain for the build-up welding of NiCrMo-0Nb alloy in this oxygen- and chlorine-containing corrosive atmosphere was 0.0143 mg/cm², while that for the NiCrMo-3.6Nb alloy reached 0.0520 mg/cm². Furthermore, reducing the Nb content significantly decreases the production costs. Therefore, for application scenarios demanding high cost-effectiveness, Nb-free nickel-based alloys present a potential cost-efficient candidate material.

Key words: PTAS niobium element nickel-based alloy metallographic structure corrosion performance

Received: 05 June 2025 32134.14.1005.4537.2025.168

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51865014);National Natural Science Foundation of China(52465040);Open Research Fund of State Key Laboratory of Material Forming and Mold Technology(P2019-012)

Corresponding Authors: XIANG Junhuai, E-mail: xiangjunhuai@163.com

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	LAN Zhiliang
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https://www.jcscp.org/EN/10.11902/1005.4537.2025.168 OR https://www.jcscp.org/EN/Y2026/V46/I3/903

Table 1 Main chemical components of NiCrMo-(0/3.6)Nb cladding alloys　　　(mass fraction / %)

Fig.1 Schematic diagram of high-temperature chlorine corrosion device

Fig.2 XRD patterns of NiCrMo-3.6Nb surfacing (a) and NiCrMo-0Nb surfacing (b)

Fig.3 Surface microstructure of NiCrMo-0Nb surfacing (a) and NiCrMo-3.6Nb surfacing (b) after aqua regia etching

Fig.4 Cross-section microstructure of NiCrMo-0Nb surfacing (a-c) NiCrMo-3.6Nb surfacing (d-f) after aqua regia etching

Fig.5 Surface morphology and elemental distribution of NiCrMo-0Nb surfacing (a) and NiCrMo-3.6Nb surfacing (b) after aqua regia etching

Fig.6 Equilibrium phase diagram of NiCrMo-0Nb (a) and NiCrMo-3.6Nb (b) calculated using JMatPro7.0 software

Fig.7 Comparison of bead width for NiCrMo-(0/3.6)Nb

Fig.8 Variation of liquid viscosity of -(0/3.6)Nb alloys with temperature

Fig.9 XRD patterns of NiCrMo-3.6Nb (a) and NiCrMo-0Nb surfacing (b) after corrosion at 800 ℃ for 60 h

Fig.10 Mass gain bar chart of NiCrMo-(0/3.6)Nb surfacing after corrosion at 800 ℃ for 60 h

Fig.11 Surface morphology and phase composition of NiCrMo-0Nb surfacing (a) and NiCrMo-3.6Nb surfacing (b) after 60 h corrosion in a mixed atmosphere of N₂-CO₂(29.8 mg/L)-O₂(23.4 mg/L)-HCl (3.53 mg/L) at 800 ℃

Fig.12 Elemental distribution maps of NiCrMo-0Nb (a) and NiCrMo-3.6Nb (b) surfacing after 60 h of corrosion at 800 ℃ in a mixed atmosphere of N₂-CO₂(29.8 mg/L)-O₂(23.4 mg/L)-HCl(3.53 mg/L)

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