Improving the Corrosion Resistance of Carbon Steel Via Aluminum-Based Coating from Ionic Liquid Electrolytes at Room Temperature

Metallurgical and Materials Transactions B Pub Date : 2024-09-09 DOI:10.1007/s11663-024-03260-6

Wen Wang, Na Li, Zhiyuan Li, Li-li Jiang, Wei-Li Song, Mingyong Wang, Shuqiang Jiao

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Abstract

Improving the corrosion resistance of carbon steel is of great importance to realize widely use in various industries. The anti-corrosion coating is a significant protective strategy. Therefore, uniform aluminum coatings (AlO_x-CS), electrodepositing in ionic liquid electrolyte at room temperature, was developed to enhance corrosion resistance of carbon steel. The lower part of the electrode has a better distribution uniformity than the upper part of the electrode, and the distribution of a line has the lowest variance. The uniform AlO_x-CS coating is the most corrosion resistant due to sealed Al₂O₃ layers. The corrosion rate of the AlO_x-CS coating is 0.4 mm a⁻¹. The self-corrosion current density of AlO_x-CS coating is 34.4 μA cm⁻², nearly 2 times compared with pristine carbon steel. The impedance value with AlO_x-CS coating is increased by nearly 300 times compared with pristine carbon steel. The morphology and composition of aluminum-based reinforced coatings had no significant changes in atmospheric exposure, 3.5 pct NaCl salt spray and 3.5 pct NaCl immersion environments. The aluminum-based reinforced coatings can enhance the lifespan of carbon steel materials, while also reducing economic losses and safety hazards.

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通过离子液体电解质中的铝基涂层提高碳钢在室温下的耐腐蚀性能

提高碳钢的耐腐蚀性对于实现在各行各业的广泛应用具有重要意义。防腐蚀涂层是一种重要的保护策略。因此，开发了在室温离子液体电解液中电沉积的均匀铝涂层（AlOx-CS），以提高碳钢的耐腐蚀性。电极下部的分布均匀性优于电极上部，一条线的分布方差最小。均匀的 AlOx-CS 涂层因密封的 Al2O3 层而具有最强的耐腐蚀性。AlOx-CS 涂层的腐蚀速率为 0.4 mm a-1。AlOx-CS 涂层的自腐蚀电流密度为 34.4 μA cm-2，是原始碳钢的近 2 倍。与原始碳钢相比，AlOx-CS 涂层的阻抗值增加了近 300 倍。在大气暴露、3.5 pct 氯化钠盐雾和 3.5 pct 氯化钠浸泡环境中，铝基增强涂层的形态和成分均无明显变化。铝基增强涂层可提高碳钢材料的使用寿命，同时还能减少经济损失和安全隐患。

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Metallurgical and Materials Transactions B

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