Chen Miao,Lin Zhangyin*.Preparation of amorphous Co-Mo-P alloy coating and its corrosion protection effect on Q235 steel[J].Plating & Finishing,2024,(9):92-101.[doi:doi: 10.3969/j.issn.1001-3849.2024.09.013]
非晶态Co-Mo-P合金镀层的制备及其对Q235
- Title:
- Preparation of amorphous Co-Mo-P alloy coating and its corrosion protection effect on Q235 steel
- 关键词:
- 非晶态Co-Mo-P合金镀层; 电沉积; 耐腐蚀性能; 腐蚀防护作用
- Keywords:
- amorphous Co-Mo-P alloy coating; electrodeposition; corrosion resistance; corrosion protection effect
- 分类号:
- TQ153.6
- 文献标志码:
- A
- 摘要:
- 采用电沉积方法在Q235钢表面制备出非晶态Co-Mo-P合金镀层，以期有效提高Q235钢的耐腐蚀性能从而增强混凝土结构的耐久性。实验结果表明：非晶态Co-Mo-P合金镀层的表面粗糙度仅为0.41 μm，平整度和致密性好于相同厚度的Zn-Ni合金镀层和热镀锌层。与Zn-Ni合金镀层和热镀锌层相比，非晶态Co-Mo-P合金镀层具有更高的膜层电阻、电荷转移电阻、低频阻抗值（|Z|0.01 Hz）和最大相位角，分别为1.44×103 Ω·cm 2、8.95×103 Ω·cm 2、1.50×104 Ω·cm 2和66.6 °，并且在模拟混凝土孔隙液中浸泡腐蚀10 d后整体腐蚀程度最轻，腐蚀失重低至1.42×10-3 g/cm 2，表现出优异的耐腐蚀性能，能够为Q235钢提供长期有效的腐蚀防护作用。原因归结为非晶态 Co-Mo-P合金镀层无晶界且不存在位错缺陷，加之表面孔洞很少，能更有效阻隔腐蚀介质并阻断其扩散路径。
- Abstract:
- The amorphous Co-Mo-P alloy coating was prepared by electrodeposition on the surface of Q235 steel in order to effectively improve the corrosion resistance of Q235 steel and enhance the durability of concrete structures. The experimental results show that the surface roughness of the amorphous Co-Mo-P alloy coating is only 0.41 μm, and the flatness and compactness of the amorphous Co-Mo-P alloy coating are better than those of Zn-Ni alloy coating and hot-dip galvanizing coating with the same thickness. Compared with Zn-Ni alloy coating and hot-dip galvanizing coating, the amorphous Co-Mo-P alloy coating has higher film resistance, charge transfer resistance, low frequency impedance (|Z|0.01Hz) and maximum phase angle, which are 1.44×103 Ω·cm 2, 8.95×103 Ω·cm 2, 1.50×104 Ω·cm 2, 66.6 °, respectively. After 10 days of immersion in simulated concrete pore solution, the overall corrosion degree of amorphous Co-Mo-P alloy coating is the lightest, and the corrosion weight loss is only 1.42×10-3 g/cm2, indicating that amorphous Co-Mo-P alloy coating possesses excellent corrosion resistance and it can provide long-term effective corrosion protection for Q235 steel. The reason is that the amorphous Co-Mo-P alloy coating has no grain boundary and no dislocation defects, and the surface holes are few, which can more effectively block the corrosive medium and block its diffusion path
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