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金属学报  2025, Vol. 61 Issue (2): 278-286    DOI: 10.11900/0412.1961.2022.00612
  研究论文 本期目录 | 过刊浏览 |
Zn-2.0Al-1.5Mg镀层在模拟海洋大气中的腐蚀行为
顾天真1,2,3, 刘雨薇1,3(), 彭灿1,2,3, 张鹏4, 王振尧1,3(), 汪川1,3, 马成4, 曹宏玮4
1 中国科学院金属研究所 沈阳 110016
2 中国科学技术大学 材料科学与工程学院 沈阳 110016
3 中国科学院金属研究所 辽宁沈阳土壤大气环境材料腐蚀国家野外科学观测研究站 沈阳 110016
4 河钢集团钢研总院 石家庄 050023
Corrosion Behavior of Zn-2.0Al-1.5Mg Coatings in Simulated Marine Atmosphere
GU Tianzhen1,2,3, LIU Yuwei1,3(), PENG Can1,2,3, ZHANG Peng4, WANG Zhenyao1,3(), WANG Chuan1,3, MA Cheng4, CAO Hongwei4
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
3 Liaoning Shenyang Soil and Atmosphere Corrosion of Materials National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4 HBIS Group Technology Research Institute, Shijiazhuang 050023, China
引用本文:

顾天真, 刘雨薇, 彭灿, 张鹏, 王振尧, 汪川, 马成, 曹宏玮. Zn-2.0Al-1.5Mg镀层在模拟海洋大气中的腐蚀行为[J]. 金属学报, 2025, 61(2): 278-286.
Tianzhen GU, Yuwei LIU, Can PENG, Peng ZHANG, Zhenyao WANG, Chuan WANG, Cheng MA, Hongwei CAO. Corrosion Behavior of Zn-2.0Al-1.5Mg Coatings in Simulated Marine Atmosphere[J]. Acta Metall Sin, 2025, 61(2): 278-286.

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摘要: 

为了推动Zn-2.0Al-1.5Mg镀层在腐蚀性较重的海洋大气环境下服役，本工作采用室内干/湿交替循环腐蚀试验(CCT)方法、腐蚀失重、SEM、XRD、EIS和动电位极化等手段，对Zn-2.0Al-1.5Mg镀层在模拟海洋大气中的腐蚀行为(腐蚀动力学、腐蚀产物演化、腐蚀形貌、电化学行为等)进行研究。结果表明：腐蚀168 h，腐蚀产物为ZnO，随着腐蚀时间的延长，腐蚀产物主要为Zn5(OH)8Cl2·H2O，到1848 h，腐蚀产物中还有少量的Zn(OH)2·0.5H2O；ZnO出现的主要原因之一是干/湿交替时间缩短，而Zn(OH)2·0.5H2O的出现与腐蚀后期Mg或Al元素的消耗有关。在模拟海洋大气中，Zn-2.0Al-1.5Mg镀层腐蚀速率随时间呈M型变化，腐蚀速率变化与腐蚀产物的演化密切相关。840 h前腐蚀速率大体呈上升趋势，仅在336~504 h 阶段腐蚀速率减小，其原因可能与腐蚀产物ZnO的消失和Zn5(OH)8Cl2·H2O的比例增多有关。
关键词 ： Zn-2.0Al-1.5Mg镀层,  海洋大气,  大气腐蚀,  腐蚀产物演化    
Abstract：

As the service environment changes, the widely used galvanized coating faces challenges due to its overly thick coating and insufficient corrosion resistance. Zn-2.0Al-1.5Mg coatings have emerged as an alternative to conventional galvanizing because of their excellent corrosion resistance and are extensively used in buildings, home appliances, and automobiles in harsh environments. The marine environment, known for its high corrosiveness, faces considerable material corrosion problems. Highly resistant materials, such as Zn-2.0Al-1.5Mg coating, stainless steel, have found applications in the marine environment. However, the development period of Zn-2.0Al-1.5Mg coating is short, and further research is required to determine its suitability for highly corrosive marine atmospheric environments. Consequently, the laboratory dry-wet alternating cycle corrosion test method, corrosion mass loss, SEM, XRD, EIS, and potentiodynamic polarization were used to investigate the corrosion behavior (e.g., corrosion kinetics, corrosion product evolution, corrosion morphology, and electrochemical behavior) of Zn-2.0Al-1.5Mg coatings in a simulated marine atmosphere. Results show that the initial corrosion product is ZnO at 168 h, with Zn5(OH)8Cl2·H2O appearing after 168 h of corrosion cycles (336, 504, 672, 840, and 1848 h). The emergence of ZnO at 168 h is attributed to the shortened dry-wet alternating cycle time, while that of Zn(OH)2·0.5H2O at 1848 h is attributed to the depletion of Mg or Al elements. The corrosion rate of Zn-2.0Al-1.5Mg coatings in the simulated marine atmosphere exhibited an M-shaped curve over time, closely related to the evolution of corrosion products. Between 0 and 840 h, the corrosion rate increased, except for a decrease between 336 and 504 h; this trend may be attributed to the disappearance of ZnO and an increase in the amount of Zn5(OH)8Cl2·H2O. Combined with the electrochemical results, it is speculated that the corrosion will accelerate with further exposure after 1848 h.
Key words： Zn-2.0Al-1.5Mg coating    marine atmosphere    atmospheric corrosion    corrosion products evolution
收稿日期: 2022-12-01     
ZTFLH:  TG172.3  
基金资助:河北省自然科学基金项目(E2021318006)
通讯作者: 刘雨薇，ywliu12s@imr.ac.cn，主要从事大气腐蚀研究；
王振尧，zhywang@imr.ac.cn，主要从事自然环境腐蚀研究
Corresponding author: LIU Yuwei, associate professor, Tel: (024)23893544, E-mail: ywliu12s@imr.ac.cn;
WANG Zhenyao, professor, Tel: (024)23893544, E-mail: zhywang@imr.ac.cn
作者简介: 顾天真，女，1995年生，博士生
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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00612      或      https://www.ams.org.cn/CN/Y2025/V61/I2/278

图1  Zn-2.0Al-1.5Mg镀层在模拟海洋大气环境中腐蚀失重和平均腐蚀速率随腐蚀时间的变化
图2  Zn-2.0Al-1.5Mg镀层腐蚀不同时间的XRD谱
图3  Zn-2.0Al-1.5Mg镀层在模拟海洋大气环境中腐蚀不同时间的宏观形貌
图4  Zn-2.0Al-1.5Mg镀层在模拟海洋大气环境中腐蚀不同时间后表面形貌的SEM像
图5  Zn-2.0Al-1.5Mg镀层在模拟海洋大气环境中腐蚀不同时间后截面形貌的SEM像
图6  Zn-2.0Al-1.5Mg镀层在模拟海洋大气环境中腐蚀1848 h后截面形貌的SEM像和EDS元素分布
图7  Zn-2.0Al-1.5Mg镀层腐蚀不同时间的动电位极化曲线
图8  Zn-2.0Al-1.5Mg镀层腐蚀不同时间的腐蚀电流密度(icorr)
图9  Zn-2.0Al-1.5Mg镀层腐蚀不同时间的Nyquist和Bode图
图10  电化学阻抗谱(EIS)等效电路

Time

h

Rs

Ω·cm2

Qr

Rr

Ω·cm2

Qdl

Rct

Ω·cm2

Chi-squared

Rp (= Rr + Rct)

Ω·cm2

yr

Ω-1·cm-2·Snr

nr

ydl

Ω-1·cm-2·Sndl

ndl
04.33 × 1011.30 × 10-56.56 × 10-17.20 × 1036.26 × 10-59.71 × 10-16.44 × 1039.29 × 10-31.36 × 104
1685.05 × 1011.48 × 10-56.81 × 10-18.26 × 1022.05 × 10-35.23 × 10-18.94 × 1025.87 × 10-31.72 × 103
3368.53 × 10-42.02 × 10-54.65 × 10-12.31 × 1026.74 × 10-79.60 × 10-12.87 × 1042.39 × 10-22.89 × 104
5042.51 × 1011.07 × 10-56.95 × 10-12.84 × 1031.19 × 10-46.36 × 10-15.52 × 1037.11 × 10-38.36 × 103
6724.21 × 10-33.03 × 10-54.58 × 10-17.89 × 1022.09 × 10-71.00 × 1006.33 × 1036.47 × 10-37.12 × 103
8403.07 × 1011.77 × 10-55.50 × 10-15.52 × 1034.13 × 10-48.78 × 10-14.59 × 1034.34 × 10-21.01 × 104
18483.14 × 10-231.51 × 10-38.38 × 10-24.70 × 10-194.63 × 10-77.34 × 10-15.95 × 1027.36 × 10-45.95 × 102
表1  EIS参数拟合结果
图11  1/ Rp随腐蚀时间的变化
图12  NaCl溶液中Cl-的平衡浓度(CCl-)随相对湿度的变化[37]
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