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Q235钢在长期服役于高盐、潮湿及工业大气等强腐蚀性环境时，易发生严重的腐蚀失效问题。针对这一现象，在硫酸盐浴中于Q235钢表面电沉积制备Zn及Zn-Co合金涂层，并详细研究涂层的耐腐蚀性。电化学测试结果显示：在电流密度为2 A/dm2的条件下，制备的Zn涂层具有较正的腐蚀电位和较低的腐蚀电流密度，表现出良好的耐腐蚀性能。在相同的电流密度下，控制镀液中Zn2+和Co2+的摩尔比为9∶1时，所制备的Zn-Co合金涂层显示出比Zn涂层更低的腐蚀电流密度(1.122μA/cm2),具备更高的涂层电阻(2 389Ω·cm2)和电荷转移电阻(1 705Ω·cm2)。此外，Zn-Co涂层的电荷转移电阻是Q235钢的2.097倍。化学成分分析揭示了Zn-Co合金涂层中含有质量分数0.7%的钴元素。微量的钴元素显著提升了Zn-Co合金涂层的抗腐蚀性，为Q235钢提供良好的保护作用。
Abstract：Q235 steel is susceptible to serious corrosion failure when it is subjected to highly corrosive environments such as high salt, humidity and industrial atmospheres in long-term service.To address this phenomenon, Zn and Zn-Co alloy coatings were prepared by electrodeposition on the surface of Q235 steel in sulfate baths, and the corrosion resistance of the coatings was studied in detail.The electrochemical test results show that Zn coating prepared at a current density of 2 A/dm2 has a more positive corrosion potential and a lower corrosion current density, demonstrating good corrosion resistance.Under the same current density, when the molar ratio of Zn2+ to Co2+ in the plating solution is controlled at 9∶1, the prepared Zn-Co alloy coating exhibits a lower corrosion current density(1.122 μA/cm2) compared to Zn coating, along with a higher coating resistance(2 389 Ω·cm2) and charge transfer resistance(1 705 Ω·cm2).Furthermore, the charge transfer resistance of Zn-Co alloy coating is 2.097 times that of Q235 steel.Chemical composition analysis reveals that the Zn-Co alloy coating contains mass fraction 0.7% of cobalt.The trace amount of cobalt significantly enhances the corrosion resistance of Zn-Co alloy coating, providing good protection for Q235 steel.
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基本信息:
中图分类号:TG174.4
引用信息:
[1]吴玉博,张冠华,吴志根,等.硫酸盐浴中电沉积Zn-Co合金涂层用于Q235钢的腐蚀防护[J].化学工程,2026,54(01):20-25+39.
基金信息:
国家自然科学基金资助项目(52370149,51976126); 国家重点研发计划(2023YFC3707701); 上海市自然科学基金资助项目(22ZR1442700)
2026-01-15
2026-01-15