Geng Cheng *,Chao Tieyan,Ge Yuwei,et al.Heat treatment and corrosion & wear resistance of steel surface coatings for anchoring highway slopes[J].Plating & Finishing,2025,(01):91-97.
doi: 10.3969/j.issn.1001-3849.2025.01.014 公路边坡锚固用钢表面涂层的热处理与耐蚀耐磨性能
- Title:
- Heat treatment and corrosion & wear resistance of steel surface coatings for anchoring highway slopes
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 为了提升公路边坡锚固用钢的表面耐蚀和耐磨性能，采用化学镀和热处理相结合的方法在锚固用45#钢基体表面制备了Ni-B涂层，研究了热处理温度对表面涂层显微形貌、物相组成、疏水性、硬度、耐蚀和耐磨性能的影响。结果表明，250 ℃和350 ℃热处理后涂层表面致密性提高，450 ℃热处理后涂层表面致密性降低，局部颗粒产生裂纹；热处理前和250 ℃热处理后锚固用钢表面涂层呈非晶态特征，升高热处理温度至350 ℃及以上时涂层主要由Fe、Ni2B、Ni3B和Ni4B3相组成，呈晶态特征；经过不同温度热处理后，锚固用钢表面涂层的硬度有不同程度增大，热处理温度为350 ℃时涂层的硬度最大（832 HV）。350 ℃热处理涂层的磨痕深度明显小于热处理前、250 ℃热处理和450 ℃热处理涂层，耐磨性较好；相较于热处理前锚固用钢表面涂层，350 ℃热处理涂层的腐蚀电位发生正向移动、腐蚀电流密度减小，450 ℃热处理涂层的腐蚀电位发生负向移动、腐蚀电流密度增大，350 ℃热处理涂层的耐蚀性最好。适宜的锚固用45#钢表面涂层的热处理温度为350 ℃，此时表面涂层的硬度最高，耐蚀和耐磨性最好。
- Abstract:
- In order to improve the surface corrosion resistance and wear resistance of steel used for anchoring highway slopes, a Ni-B coating was prepared on the surface of 45 # steel substrate for anchoring using a combination of chemical plating and heat treatment. The effect of heat treatment temperature on the microstructure, phase composition, hydrophobicity, hardness, corrosion resistance and wear resistance of the surface coating was studied. The results showed that after heat treatment at 250 ℃ and 350 ℃, the surface density of the coating increased, while after heat treatment at 450 ℃, the surface density of the coating decreased, and local particles produced cracks; The surface coating of anchoring steel before and after heat treatment at 250 ℃ exhibits amorphous characteristics, when the heat treatment temperature is raised to 350 ℃ or above, the coating is mainly composed of Fe, Ni2B, Ni3B, and Ni4B3 phases, exhibiting crystalline characteristics; After heat treatment at different temperatures, the hardness of the surface coating on anchoring steel increases to varying degrees, the hardness of the coating is highest at a heat treatment temperature of 350 ℃ (832 HV). The wear depth of the 350 ℃ heat treated coating is significantly lower than that of the pre-heat treated, 250 ℃ heat treated, and 450 ℃ heat treated coatings, indicating better wear resistance; Compared to the steel surface coating used for anchoring before heat treatment, the corrosion potential of the 350 ℃ heat treatment coating shifts forward and the corrosion current density decreases, while the corrosion potential of the 450 ℃ heat treatment coating shifts negatively and the corrosion current density increases. The corrosion resistance of the 350 ℃ heat treatment coating is the best. The suitable heat treatment temperature for the surface coating of 45 # steel for anchoring is 350 ℃. At this time, the surface coating has the highest hardness, corrosion resistance and wear resistance
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