| 摘要: |
| 为了探讨非晶 Ni-Mo-P 镀层中微观组织和结构的变化对镀层耐腐蚀性能的影响,利用化学镀方法制备出非晶 Ni-Mo-P 镀层,随后对其进行 250 ℃不同时间的热处理,获得了 5 种具有不同微观组织结构的镀层。 利用 XRD 曲线和其对应的径向分布函数对镀层的微观结构进行分析。 利用 TEM 方法对镀层的微观组织进行观察和分析。 通过 DSC 曲线放热峰的面积可以粗略估计非晶镀层中微观颗粒和有序团簇所占的比例。 利用电化学方法研究镀层在 0. 5 mol / L 硫酸溶液中的耐腐蚀性能并利用 XPS 方法对腐蚀产物进行分析。 结果表明: 250 ℃ 热处理后,镀层整体仍保持非晶结构特征,但内部的微观组织和结构均发生变化。 随着热处理时间的延长,非晶镀层中微观颗粒和有序团簇所占比例增大, 析出晶体相的种类也在增多,镀层的耐蚀性能在逐渐变差。 |
| 关键词: 非晶镀层 热处理 微观结构 有序团簇 耐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20201121001 |
| 分类号:TG174.441 |
| 文章编号:1007-9289(2020)06-0093-07 |
| 文献标识码:A |
| 基金项目:山东省重点研发计划(2019GGX102072)； 山东省自然科学基金(ZR2020ME165)； 国家自然科学基金(51975331) |
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| Influence of Microstructure Evolution on Corrosion Resistance of Amorphous Ni-Mo-P Coating |
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Zhao Guanlin, Liu Shushuai, Wu Dongting, Zou Yong
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School of Materials Science and Engineering, Shandong University, Jinan 250061 , China
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| Abstract: |
| In order to investigate the influence of microstructure evolution on corrosion resistance of amorphous Ni-Mo-P coat- ing, the amorphous Ni-Mo-P coating was prepared by electroless plating method, and then five coatings with different microstruc- ture were obtained by heat treatment at 250 ℃ for different time. The local atomic structure of these coatings were analyzed by XRD patterns and the corresponding atomic pair distribution functions. TEM results were used to analyze coatings microstruc- ture. The proportion of microscopic particles and order clusters in amorphous matrix was rough estimated through the DSC exo- thermic peak areas. Corrosion resistance in 0. 5 mol / L sulfuric acid solution was investigated via electrochemical techniques and the corrosive products were evaluated by XPS method. Results show that all annealed coatings still remain amorphous structure, as a contrast, the microstructures are changed. With the heating time increased, the content of microscopic particles and order clusters inside the matrix is increasing, and more types of crystal phases appeare. Meanwhile, the decreasing of corrosion resist- ance of these coatings is in agreement with the extension of heating time. |
| Key words: amorphous coating heat treatment microstructure order cluster corrosion resistance |
