YAO Zhishen,NIU Zongwei*,LIU Bin,et al.Effect of Ultrasonic Vibration on Surface Morphology and Corrosion Resistance of 65 Steel Electrolytic Phosphating Film[J].Plating & Finishing,2019,(9):24-28.[doi:10.3969/j.issn.1001-3849.2019.09.005]
超声振动对65钢电解磷化膜表面形貌与耐蚀性的影响
- Title:
- Effect of Ultrasonic Vibration on Surface Morphology and Corrosion Resistance of 65 Steel Electrolytic Phosphating Film
- Keywords:
- phosphating; ultrasonic field; electrolytic phosphating; surface morphology; corrosion resistance
- 文献标志码:
- A
- 摘要:
- 为减少锌系电解磷化液中对人体有害的促进剂，同时改善磷化膜的力学性能及化学性能，本文借助超声辅助作用对65钢进行电解磷化处理。采用不同磷化方式在65钢表面制备磷化膜，借助扫描电子显微镜（SEM）、能谱仪（EDS）、电化学工作站、膜厚测量仪等设备对磷化膜的形貌、结构、成分、耐蚀性进行表征。结果表明，超声辅助电解磷化方式下生成的磷化膜主要成分为磷酸锌沉积层，磷化膜均匀、细致、表面粗糙度小；晶体成簇状方式生长，呈粒状分布，尺寸约为1 μm，晶体之间排列紧密；当磷化时间为120 s时，膜厚可达到20 μm，自腐蚀电位由基材的-0.91 V提高到-0.75 V，自腐蚀电流密度减小为电解磷化膜的二分之一，基材的三分之一。超声辅助电解磷化处理方式能明显提高磷化膜与基体结合强度，缩短磷化时间，改善基体耐蚀性。
- Abstract:
- In order to reduce the harmful agent in the zinc-system electrolytic phosphate solution and improve mechanical properties and chemical properties of the phosphating film, electrolytic phosphating treatment of 65 steel was carried out with the aid of ultrasound. Phosphating film was prepared on the surface of 65 steel by different phosphating methods and the morphology, structure, composition and corrosion resistance were studied by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), electrochemical workstation, film thickness measuring instrument, etc. The results show that the main component of the phosphating film formed by ultrasonic assisted electrolytic phosphating is zinc phosphate deposits. The phosphating film is uniform, compact and the surface roughness is low. Its crystals grow in a cluster-like manner and distributed in a granular shape with a size of about 1 μm, and the crystals are arranged tightly. When the phosphating time is 120 s, the film thickness can reach 20 μm. The corrosion potential increased from -0.91 V to -0.75 V and the self-corrosion current density is reduced to one-half of the electrolytic phosphating film and one-third of the substrate. Ultrasound-assisted electrolytic phosphating treatment can increase the bonding strength between the phosphating film and the matrix, shorten the phosphating time and improve the corrosion resistance of the substrate.
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备注/Memo
收稿日期： 2019-04-16；修回日期： 2019-05-16
通信作者： 牛宗伟，email:niuzongwei@sdut.edu.cn
基金项目： 山东省自然科学基金资助项目（ZR2015EM053）；黄河三角洲研究院创新研究基金资助项目