S355海洋鋼表面微弧氧化復合膜層耐蝕性能

賀星; 孔德軍; 宋仁國

doi:10.13374/j.issn2095-9389.2019.09.006

S355海洋鋼表面微弧氧化復合膜層耐蝕性能

doi: 10.13374/j.issn2095-9389.2019.09.006

賀星^{1, 2},
孔德軍^{2, 3},
宋仁國^{1, 2, ,}

1.
常州大學材料科學與工程學院, 常州 213164
2.
常州大學江蘇省材料表面科學與技術重點實驗室, 常州 213164
3.
常州大學機械工程學院, 常州 213164

基金項目:

江蘇省重點研發計劃資助項目 BE2016052

詳細信息

通訊作者:
宋仁國, E-mail: songrg@hotmail.com

中圖分類號: TG174.44
計量
- 文章訪問數: 962
- HTML全文瀏覽量: 562
- PDF下載量: 36
- 被引次數: 0
出版歷程
- 收稿日期: 2018-08-14
- 刊出日期: 2019-09-01

Corrosion resistance of micro-arc oxidation composite coatings on S355 offshore steel

HE Xing^{1, 2},
KONG De-jun^{2, 3},
SONG Ren-guo^{1, 2
, ,}

1.
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
2.
Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China
3.
School of Mechanical Engineering, Changzhou University, Changzhou 213164, China

摘要

摘要: 采用激光熔覆與微弧氧化技術相結合在海洋鋼表面制備了復合膜層.運用掃描電子顯微鏡（SEM）、能譜儀（EDS）和X射線衍射儀（XRD）表征復合膜層的微觀結構，采用極化曲線、電化學阻抗譜、腐蝕磨損實驗和浸泡腐蝕實驗等測試方法研究膜層在質量分數3.5%的NaCl水溶液中腐蝕行為，并與熔覆涂層和基體進行對比.結果表明：復合膜層主要分為內致密層和外疏松層，疏松層主要由γ-Al₂O₃組成，致密層主要由α-Al₂O₃組成，與基底層結合較好，復合膜層表面硬度最大能達到HV_0.2 1423.3，比熔覆涂層高47.6%，其硬度較S355海洋鋼有顯著提升.基體在腐蝕和磨損交互作用中主要以腐蝕加速磨損為主，涂層在交互作用中主要以磨損加速腐蝕為主，在經過微弧氧化處理后，膜層的自腐蝕電位負移，鈍態電流密度上升，抗磨蝕性能明顯提高.熔覆涂層的浸泡腐蝕方式以點蝕為主，復合膜層腐蝕較輕微，阻抗模值最大能達到10^5.3 Ω·cm²，比熔覆層提高兩個數量級，這表明復合處理可進一步提高涂層的耐腐蝕性.
- 海洋鋼 /
- 激光熔覆 /
- 微弧氧化 /
- 腐蝕
Abstract: Composite coatings were prepared by laser cladding combined with micro-arc oxidation technique on the surface of S355 offshore steel, and the composite coating structures were analyzed using scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The corrosion behavior of the composite coating in 3.5% NaCl solution was investigated by polarization curve, electrochemical impedance spectroscopy, corrosive wear test, and immersion corrosion test, and compared with that of the cladding layer and substrate. The results show that the composite coating is mainly divided into inner dense layer and outer loose layer. The loose layer is mainly composed of γ-Al₂O₃, and the dense layer is mainly composed of α-Al₂O₃, and the surface hardness of the composite coating reaches the maximum value of HV_0.2 1423.3, which is 47.6% higher than that of the cladding coating. Moreover, the surface hardness of S355 offshore steel is significantly improved. The interaction between corrosion and wear in the substrate is mainly corrosion-accelerating abrasion, whereas that in the coating is wear-accelerating corrosion. After micro-arc oxidation treatment, the corrosion potential of the composite coating moves negatively, the passive current density increases, the scale factor of wear-accelerated corrosion gradually decreases, and the corrosive wear resistance of the coating significantly improves. The immersion corrosion method of the cladding coating is mainly pitting corrosion, the composite coating is slightly corroded, and the maximum impedance modulus reaches 10^5.3 Ω·cm², which is two orders of magnitude higher than that of the cladding coating. This finding indicates that the corrosive wear resistance of the coating can be further improved after composite treatment.
- offshore steel /
- laser cladding /
- micro-arc oxidation /
- corrosion

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圖 1 復合涂層截面形貌(a)與微弧氧化層形貌(b)

Figure 1. Cross-sectional morphologies of the composite coating (a) and MAO layer (b)

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圖 2 不同制備方式下涂層表面X射線衍射圖譜. (a) LC; (b) LC+MAO

Figure 2. XRD patterns of the coatings prepared by different methods: (a) LC; (b) LC+MAO

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圖 3 不同制備方式下涂層表面形貌及能譜圖. (a, b) LC; (c, d) LC+MAO

Figure 3. Surface morphologies and EDS analysis results of the coatings prepared by different methods: (a, b) LC; (c, d) LC+MAO

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圖 4 復合膜層顯微硬度分布

Figure 4. Microhardness distribution of the composite coating

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圖 5 不同制備方式下涂層在3.5%NaCl溶液中磨損后的形貌. (a) LC; (b) LC+MAO

Figure 5. Surface morphologies of coatings prepared by different methods after abrasion in 3.5% NaCl solution: (a) LC; (b) LC+MAO

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圖 6 不同狀態下基體與涂層的Tafel極化曲線. (a) 靜態; (b) 磨損狀態

Figure 6. Potentiodynamic polarization of the substrate and coating at different states: (a) static state; (b) wear state

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圖 7 基體與涂層的腐蝕和磨損以及材料總損失的交互作用.(a)交互作用；(b)磨損速率；(c)腐蝕速率；(d)總損失率

Figure 7. Synergetic contributions of corrosion and wear to each other and total material loss of coatings after abrasion in 3.5% NaCl solution: (a) synergetic effect; (b) wear rate; (c) corrosion rate; (d) total loss rate

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圖 8 不同制備方式下涂層浸泡后表面形貌與能譜圖. (a, b) LC; (c, d) LC+MAO

Figure 8. Surface morphologies and EDS analysis results of coatings prepared by different methods after immersion: (a, b) LC; (c, d) LC+MAO

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圖 9 涂層與基體在3.5%NaCl溶液中的Nyquist圖(a)和Bode圖(b)

Figure 9. Nyquist (a) and Bode (b) plots of the substrate and coating in 3.5% NaCl solution

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圖 10 阻抗譜等效電路圖. (a)基體；(b)涂層

Figure 10. Equivalent circuits of the EIS plots: (a) substrate; (b) coating

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圖 11 復合膜層浸泡腐蝕后截面形貌.(a) 復合膜層；(b) 1和2區域細節

Figure 11. Cross-sectional morphologies of the composite coating after immersion corrosion: (a) composite coating; (b) details of areas 1 and 2

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表 1 激光熔覆工藝參數

Table 1. Laser cladding process parameters

功率/kW	掃描速度/(mm·min^-1)	送粉率/(g·min^-1)	氬氣流速/(L·min^-1)	光斑直徑/mm
1.2	360	8	15	3

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表 2 基體與涂層電化學阻抗圖譜的擬合數據

Table 2. Fitting data of EIS related to substrate and coating

試樣	R_s/(Ω·cm²)	Q_b/(Ω^-1·s^-n_b·cm^-2)	n_b	R_b/(kΩ·cm²)	Q_t/(Ω^-1·s^-n_t·cm^-2)	n_t	R_t/(kΩ·cm²)
S355	6.26	—	—	—	1.083×10^-3	0.8	0.735
LC	4.67	6.06×10^-6	0.88	1.95	4.48×10^-5	0.87	12.8
LC+MAO	6.24	7.47×10^-6	0.75	8.48	4.11×10^-5	0.83	82.4

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