INFLUENCE OF THE CATHODIC PULSE ON THE FORMATION AND MORPHOLOGY OF OXIDE COATINGS ON ALUMINIUM PRODUCED BY PLASMA ELECTROLYTIC OXIDATION

被引：45

作者：

Gebarowski, W. ^{[1
]}

Pietrzyk, S. ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, Fac Nonferrous Met, PL-30059 Krakow, Poland

来源：

ARCHIVES OF METALLURGY AND MATERIALS | 2013年 / 58卷 / 01期

关键词：

Plasma electrolytic oxidation; PEO; Alumina coatings; Aluminium oxide;

D O I：

10.2478/v10172-012-0180-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Plasma electrolytic oxidation (PEO) is an effective method to obtain hard ceramic coatings on Al, Mg and Ti alloys. Micro-discharges occurring on the electrode surface during process promote the creation of crystalline oxides phases which improve mechanical properties of the coating. By using alternate current (AC) at some current conditions the process can be conducted in 'soft' spark regime. This allows producing thicker layers, increasing growth rate and uniformity of layer, decreasing amount of pores and defects. These facts proof the importance of cathodic pulse in the PEO mechanism; however its role is not well defined. In this work, influence of anodic to cathodic current density ratio on kinetics of coating growth, its morphology and composition were investigated. The PEO process of pure was conducted in potassium hydroxide with sodium metasilicate addition. The different anodic to cathodic average currents densities ratios of pulses were applied. The phase composition of coatings was determined by XRD analysis. Morphology of obtained oxide layers was investigated by SEM observations.

引用

页码：241 / 245

页数：5

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