Investigation of the properties of oxide coatings on titanium alloys obtained by plasma electrolytic oxidation

IF 0.8 Q4 METALLURGY & METALLURGICAL ENGINEERING
Z. Ramazanova, M. Zamalitdinova, M. Kovalenko
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Abstract

The use of structures made of titanium and its alloys, which have improved corrosion, physical and mechanical properties, are in demand in many industries. In this regard, the processes of modifying the surface of metals are of interest. One of the modern and promising methods of metal surface treatment is plasma electrolytic oxidation. Currently, there is a problem of widespread use of this process when DC modes are used in the implementation of the process. This is due to the large consumption of electricity. The purpose of this work is to study the morphological and corrosion properties of oxide coatings obtained in the pulsed anode-cathode mode on titanium alloys VT1-0 and VT5 in various electrolyte solutions. Modification of the surface of titanium alloys was carried out at the duration of the anode current pulse of 250 ± 25 microseconds, the duration of the cathode current pulse of 5 ± 0.5 ms, the repetition frequency of the anode and cathode pulses of 50 ± 0.5 Hz. Alkaline solutions served as electrolytes. Oxide coatings obtained in various electrolytes are characterized by different porosity and coating thickness. Coatings with a finely porous structure, with an average pore diameter from 0.09 microns to 0.4 microns, and larger pore sizes of 0.6 – 0.7 microns were obtained. The porosity of the coatings ranges from 6.12% to 12.2%. According to the data of energy dispersion analysis, it was found that the structure of oxide coatings includes both components of the processed metal and components of the electrolyte solution. The main components, in this case, are oxygen and processed metal, as well as other elements such as boron, phosphorus, aluminium, fluorine, sodium, silicon and others. Corrosion tests according to GOST 9.308-85 under the influence of neutral salt mist at a temperature of (35 ± 2) °C with 1500 hours in the Ascott CC 450 chamber, it was shown that there was no corrosion damage to the coatings.
等离子体电解氧化钛合金氧化膜的性能研究
许多行业都需要使用钛及其合金制成的结构,因为钛及其合金具有更好的腐蚀、物理和机械性能。在这方面,修饰金属表面的过程是令人感兴趣的。等离子体电解氧化是金属表面处理的现代和有前途的方法之一。目前,当采用直流模式实现该工艺时,存在着广泛使用该工艺的问题。这是由于电力的大量消耗。本工作的目的是研究脉冲阳极-阴极模式下钛合金VT1-0和VT5在不同电解质溶液中的氧化膜的形态和腐蚀性能。阳极电流脉冲持续时间为250±25微秒,阴极电流脉冲持续时间为5±0.5 ms,阳极和阴极脉冲重复频率为50±0.5 Hz时,对钛合金表面进行改性。碱性溶液作为电解质。在不同的电解质中得到的氧化物涂层具有不同的孔隙率和涂层厚度。涂层具有良好的多孔结构,平均孔径为0.09 ~ 0.4微米,孔径较大为0.6 ~ 0.7微米。涂层孔隙率为6.12% ~ 12.2%。根据能量分散分析的数据,发现氧化膜的结构既包括被加工金属的成分,也包括电解质溶液的成分。在这种情况下,主要成分是氧气和加工过的金属,以及其他元素,如硼、磷、铝、氟、钠、硅等。按照GOST 9.308-85标准,在(35±2)℃的中性盐雾作用下,在雅诗阁CC 450恒温箱中进行1500小时的腐蚀试验,结果表明,涂层无腐蚀损伤。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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