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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (4): 1041-1050    DOI: 10.11902/1005.4537.2024.331
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Influence of N2 Flow and Target-substrate Distance on Microstructure and Corrosion Resistance Properties of Multi-arc Ion Plated AlSiN Nano-composite Coatings
LI Mao1, DENG Ke2, CHEN Yanxiang2, LIU Zhonghao1, LI Shang1, GUO Yuting1, DONG Xuanpu1, CAO Huatang1()
1 State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Zhuzhou Hanjie Aviation Science & Technology Co., Ltd., Zhuzhou 412002, China
Cite this article: 

LI Mao, DENG Ke, CHEN Yanxiang, LIU Zhonghao, LI Shang, GUO Yuting, DONG Xuanpu, CAO Huatang. Influence of N2 Flow and Target-substrate Distance on Microstructure and Corrosion Resistance Properties of Multi-arc Ion Plated AlSiN Nano-composite Coatings. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1041-1050.

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Abstract  

AlSiN nano-composite coatings were prepared on TC4 Ti-alloy substrate by using multi-arc ion plating technique. The influence of N2 flow rate and target-substrate distance on their microstructure, mechanical properties and corrosion resistance in 3.5%NaCl solution was investigated. The results show that the variation of plating process parameters influence the crystalline growth mode of the AlSiN coating. By longer target-substrate distances and higher N2 gas flow the prepared AlSiN coatings exhibited higher crystallinity via a columnar grain growth mode, while a dense coating of finer grains or amorphous structure was obtained by shorter distances and lower N2 gas flow rates. Comparatively, the AlSiN coating of higher crystallinity exhibits higher microhardness and excellent mechanical properties. The corrosion resistance of the coatings was influenced by the combined effects of crystallization growth mode and mechanical properties, namely the crystallization mode may affect the penetration of the corrosive medium and the formation of the surface oxide scale, while the mechanical properties may be related with the strength and the generation of defects of the coating. Electrochemical data indicate that the AlSiN nanocomposite coating prepared by a N2 flow of 0.15 L/min and a target-substrate distance of 180 mm exhibited the optimal corrosion resistance, showing one order of magnitude reduction in corrosion current density compared to that of the TC4 substrate.

Key words:  arc ion plating      AlSiN coating      corrosion resistance      TC4 Ti-alloy     
Received:  09 October 2024      32134.14.1005.4537.2024.331
ZTFLH:  TG174  
Fund: Liaoning Key Laboratory of Aero-engine Materials Tribology(LKLAMTF202503)
Corresponding Authors:  CAO Huatang, E-mail: caoht@hust.edu.cn

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2024.331     OR     https://www.jcscp.org/EN/Y2025/V45/I4/1041

ProcedureCurrent / AAr flow L·min-1N2 gas flow L·min-1Chamber pressure / PaNegative bias / VRotational speed / r·min-1Temperature℃Time min
TiAlSi
Ar+ etching--0.05-1.040015-10
TiN layer70-0.050.102.05015-5
AlSiN layer-600.050.05-0.202.050520050
Table 1  Deposition parameters of AlSiN coating by AIP
Fig.1  Surface and cross-sectional morphologies of AlSiN coatings prepared by AIP at the nitrogen flow rates of 0.05 L/min (a1-a3), 0.10 L/min (b1-b3), 0.15 L/min (c1-c3) and 0.20 L/min (d1-d3)
Fig.2  Surface and cross-sectional morphologies of AlSiN coatings prepared by AIP at the target-substrate distances of 180 mm (a1-a3), 260 mm (b1-b3) and 340 mm (c1-c3)
Fig.3  GIXRD patterns of AIP deposited AlSiN coatings under the different conditions of N2 flow rate (a) and target-substrate distance (b)
Fig.4  Chemical compositions of AlSiN coatings deposited by AIP under the different conditions of N2 flow rate (a) and target-substrate distance (b)
Fig.5  XPS spectra of AlSiN coatings deposited by AIP under the different conditions of N2 flow rate (a) and target-substrate distance (b)
Fig.6  Mechanical properties of AlSiN coatings deposited by AIP at different N2 flow rates: (a) hardness and elastic modulus,(b) hardness-to-elastic modulus ratio
Fig.7  Mechanical properties of AlSiN coatings deposited by AIP at different target-substrate distances: (a) hardness and elastic modulus, (b) hardness-to-elastic modulus ratio
Fig.8  Open circuit potentials (a) and polarization curves (b) of AlSiN coatings deposited by AIP at different N2 flow rates
ItemIcorr / 10-8 A·cm-2Ecorr / V
TC4 substrate60.55-0.39
0.05 L/min8.30-0.65
0.10 L/min20.64-0.47
0.15 L/min4.56-0.42
0.20 L/min10.73-0.42
Table 2  Fitting parameters of polarization curves of AlSiN coatings deposited by AIP at different N2 flow rates
Fig.9  Nyquist (a) and Bode (b, c) plots of AlSIN coatings deposited by AIP at different N2 flow rates
Fig.10  Equivalent circuit model
N2 / L·min-1Rs / Ω·cm2Qc / μF·cm-2ncRc / Ω·cm2Qdl / μF·cm-2ndlRct / Ω·cm2
0.0529.6492.1810.681133.64.6760.871.575 × 106
0.1019.9029.5420.62186.9822.2880.845.742 × 105
0.1515.7504.3590.74630.051.8420.722.301 ×106
0.2015.1429.6240.7875.529.8200.761.033 × 106
Table 3  Fitting data of EIS of AlSiN coatings deposited by AIP at different N2 flow rates
Fig.11  Open circuit potentials (a) and polarization curves (b) of AlSiN coatings deposited by AIP at different target-to-substrate distances
ItemIcorr / 10-8 A·cm-2Ecorr / V
TC4 substrate60.55-0.39
340 mm4.56-0.42
260 mm4.58-0.38
180 mm2.65-0.35
Table 4  Fitting parameters of polarization curves of AlSiN coatings deposited by AIP at different target-to-substrate distances
Fig.12  Nyquist (a) and Bode (b, c) plots of AlSiN coatings deposited by AIP at different target-substrate distances
Distance / mmRs / Ω·cm2Qc / μF·cm-2ncRc / Ω·cm2Qdl / μF·cm-2ndlRct / Ω·cm2
18029.1532.1680.75998.410.8990.744.413 × 106
26028.2482.6770.68685.790.2990.813.549 × 106
34015.754.3590.74630.051.8420.722.301 × 106
Table 5  Fitting data of EIS of AlSiN coatings deposited by AIP at different target-substrate distances
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