Zn-Al冷喷涂复合涂层耐3.5 wt.%NaCl溶液腐蚀行为

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (2): 17-23.

Zn-Al冷喷涂复合涂层耐3.5 wt.%NaCl溶液腐蚀行为

孙永江¹, 张金玲², 翟海民², 王海鹏³, 李文生^*2

1.甘肃路桥公路投资有限公司, 甘肃兰州 730050;
2.兰州理工大学材料科学与工程学院, 甘肃兰州 730050;
3.上海蓝滨石化设备有限责任公司, 上海 201518

收稿日期:2022-08-31 出版日期:2023-04-28 发布日期:2023-05-05
通讯作者: 李文生(1973-),男,甘肃武威人,博士,教授.Email:liws@lut.edu.cn
基金资助:
国家自然科学基金(52075234),国家重点研发计划政府间项目(2022YFE0121900),国家 “111计划”项目(D21032)

Corrosion behaviors cold spraying Zn-Al composite coating in 3.5 wt.% NaCl solution

SUN Yong-jiang¹, ZHANG Jin-ling², ZHAI Hai-min², WANG Hai-peng³, LI Wen-sheng²

1. Gansu Luqiao Highway Investment Co. Ltd., Lanzhou 730050, China;
2. School of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. LANPEC Technologies Limited, Shanghai 201518 China

Received:2022-08-31 Online:2023-04-28 Published:2023-05-05

摘要/Abstract

摘要： 利用低压冷喷涂技术在Q235普通碳素钢基体表面沉积不同Al质量分数Zn-Al复合涂层,采用开路电位和极化曲线电化学测试方法,分析了Zn-Al复合涂层在3.5 wt.%NaCl溶液中浸泡的腐蚀电位,阻抗值以及腐蚀电流密度;利用附带能谱仪的扫描电子显微镜和X射线衍射仪分析了其在3.5 wt.%NaCl溶液浸泡1 440 h后的涂层组织形貌、特定区域元素分布以及物相变化.研究表明:在3.5 wt.%NaCl溶液中,随着Al质量分数的增加,涂层耐腐蚀性能提高,当Al质量分数大于35%时,涂层耐腐蚀性能更加优越.因为腐蚀过程中Zn元素优先发生腐蚀,易形成稳定性较好的氧化膜,且Al抑制了Zn的活性从而减缓了腐蚀速率,Al质量分数越高,抑制效果越好.Zn-Al复合涂层在3.5 wt.%NaCl溶液的腐蚀机制为均匀腐蚀、点蚀、局部点蚀以及腐蚀产物的自我封闭.

关键词: 冷喷涂, Zn-Al复合涂层, Al质量分数, 耐腐蚀性, 腐蚀行为

Abstract: The Zn-Al composite coating with different Al content had been deposited on the surface of Q235 steel by low pressure cold spraying. The corrosion potential, impedance value and corrosion current density of Zn-Al composite coating in 3.5 wt.% NaCl solution were analyzed by means of open-circuit potential and polarization curves. The morphology of the coating and the content of elements in the specific area were characterized by scanning electron microscope with energy dispersive spectrometer, X-ray diffractometer was used to analyze the coating phase after corrosion in 3.5wt.% NaCl solution for 1 440 h. The results showed that the corrosion resistance of the coating is better with the increase of Al content in 3.5 wt.% NaCl solution, and the corrosion resistance of the coating is better when the Al content is greater 35%. Because corrosion of zinc is prior than that of Al element, and the stable oxidation film is formed, at the same time, Al element inhibits the activity of zinc to slow down the corrosion rate, and the higher Al content has the better results. The corrosion mechanism of Zn-Al composite coating in 3.5 wt.% NaCl solution is uniform corrosion, pitting, local pitting and self-sealing of corrosion products.

Key words: cold-spray, Zn-Al composite coating, Al content, corrosion resistance, corrosion mechanism

中图分类号:

TG174.4

孙永江, 张金玲, 翟海民, 王海鹏, 李文生. Zn-Al冷喷涂复合涂层耐3.5 wt.%NaCl溶液腐蚀行为[J]. 兰州理工大学学报, 2023, 49(2): 17-23.

SUN Yong-jiang, ZHANG Jin-ling, ZHAI Hai-min, WANG Hai-peng, LI Wen-sheng. Corrosion behaviors cold spraying Zn-Al composite coating in 3.5 wt.% NaCl solution[J]. Journal of Lanzhou University of Technology, 2023, 49(2): 17-23.

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