Enhancement of Oxide Coatings Quality Formed by Electrolytic Oxidation Methods on Inner Surfaces of Lengthy Products

IF 0.9 Q3 Engineering Surface Engineering and Applied Electrochemistry Pub Date : 2023-12-14 DOI:10.3103/s1068375523060169

O. E. Tchufistov, V. N. Malyshev, A. N. Zolkin, E. A. Tchufistov

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Abstract

It is known that the methods of electrolytic oxidation, including traditional anodizing and microarc oxidation, implemented according to classical schemes in electrolytic baths with mechanical, pneumatic, and magnetic mixers, cannot provide high-quality homogeneous oxide coatings on the inner surfaces of products made from valve metal alloys. In this paper, the principal possibility of obtaining high-quality uniform coatings on the extended internal surfaces of products, including the surfaces of deep holes, when an electrolyte solution is passed through them, is revealed. It has been experimentally proved that, based on the proposed approach, it is possible to process products with deep holes, achieving a ratio of both minimum and maximum values of the thickness and the breakdown voltage of coatings on the internal and external surfaces in a range of 0.85–0.93. A possibility of forming coatings exclusively on the internal surfaces of products without changing the state of their external surfaces, moreover, without using expensive electrolytic baths—inside internal cavities of products themselves, is shown. A good correlation between the values of the thickness and of the breakdown voltage of coatings has been established. As a result, a possibility of indirectly determine the coatings thickness based on the results of their breakdown voltage measuring has been substantiated.

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提高通过电解氧化方法在长形产品内表面形成的氧化物涂层的质量

摘要:众所周知，传统的电解氧化方法，包括传统的阳极氧化和微弧氧化，在机械、气动和磁力搅拌器的电解槽中进行，不能在阀门金属合金制成的产品的内表面提供高质量的均匀氧化涂层。本文揭示了当电解质溶液通过产品扩展内表面(包括深孔表面)时，在产品扩展内表面获得高质量均匀涂层的主要可能性。实验证明，基于所提出的方法，可以加工深孔产品，实现内外表面涂层厚度和击穿电压的最小值和最大值之比在0.85-0.93之间。在不改变产品外表面状态的情况下，仅在产品内表面形成涂层的可能性，而且，不使用昂贵的电解浴-产品本身的内腔。建立了涂层厚度值与击穿电压值之间的良好相关性。结果表明，根据击穿电压测量结果间接确定涂层厚度的可能性得到了证实。

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来源期刊

Surface Engineering and Applied Electrochemistry Engineering-Industrial and Manufacturing Engineering

CiteScore

1.60

自引率

22.20%

发文量

期刊介绍： Surface Engineering and Applied Electrochemistry is a journal that publishes original and review articles on theory and applications of electroerosion and electrochemical methods for the treatment of materials; physical and chemical methods for the preparation of macro-, micro-, and nanomaterials and their properties; electrical processes in engineering, chemistry, and methods for the processing of biological products and food; and application electromagnetic fields in biological systems.