碱源对钢表面原位生长LDH抗腐蚀膜的影响
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深圳大学

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国家自然科学基金资助项目(U1801254,52078298,52122907)


Effect of Alkali Source on the In-situ Growth of LDH Anti-corrosion Film on the Surface of Steel
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Shenzhen University

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National Natural Science Foundation of China, China (Nos.: U1801254, 52078298, 52122907)

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    摘要:

    为提升建筑用钢抗腐蚀性能,采用水热法在钢表面原位生长Co-Al-CO3-LDH防锈膜,并研究尿素,碳酸钠,碳酸氢钠作为碱源对反应体系的影响,揭示钢表面生长LDH膜的关键因素. 本研究还对不同尿素浓度生长的LDH膜微观结构进行对比,结合电化学法表征LDH膜的抗腐蚀性能,分析尿素浓度的影响规律. 结果表明,尿素作为碱源才能在钢上原位生长LDH;尿素常温呈中性,Al离子水解形成无定形氢氧化铝沉积在钢表面作为LDH晶核;反应温度升高尿素水解使溶液呈碱性,LDH晶核生长成膜;尿素浓度较低时,LDH片尺寸大,膜有较多孔洞;尿素浓度较高时,LDH片尺寸较小但会相互挤压产生裂纹;尿素浓度为0.375 M时,LDH膜生长致密有良好抗腐蚀性能.

    Abstract:

    The Co-Al-CO3-LDH anti-corrosion film was grown in-situ on the surface of steel by hydrothermal method to improve the corrosion resistance of building steel. Effect of urea, sodium carbonate and sodium bicarbonate as alkali sources on the reaction system was studied to reveal the key factors of growing LDH film on steel surface. In addition, the microstructures of LDH films grown with different urea concentrations were compared and the corrosion resistance of LDH films were characterized by electrochemical method to analyze the effect of urea concentration. The results show that LDH can in-situ grown on the steel surface only when urea is used as the alkali source. Urea is neutral at room temperature, and Al ions are hydrolyzed to form amorphous aluminum hydroxides which are deposited on the surface of steel as LDH crystal nuclei. The hydrolysis of urea accelerates when the reaction temperature increases. Therefore, the alkaline environment of the solution causes LDH nuclei to grow into films. What’s more, the LDH film prepared with low urea concentration has pores and larger size of LDH sheets; while the LDH sheets prepared with high urea concentration have small size and will squeeze each other to crack. Hence, the LDH film prepared at urea concentration of 0.375 M grows compactly and has satisfied corrosion resistance.

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  • 收稿日期:2022-01-18
  • 最后修改日期:2022-03-08
  • 录用日期:2022-03-15
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