Abstract
The results of surface modification of magnesium alloys by plasma electrolytic oxidation (PEO) and post-treatment in suspension of tetrafluoroethylene (TFE) telomeric solution or superdispersed polytetrafluoroethylene (SPTFE) dispersion have been presented. Electrochemical, tribological properties and wetting ability of obtained protective composite coatings were investigated. The fabricated coatings decrease both the corrosion current density (1.7×10 -9 –5.4×10 -11 A/cm 2 ) and wear (9.8×10 -6 –7.6×10 -7 mm 3 /(N m)) by orders of magnitude as compared to bare magnesium alloy (5.3×10 -5 A/cm 2 and 3.8×10 -3 mm 3 /(N m)) and base PEO-coating (2.4×10 -7 A/cm 2 and 1.7×1 -3 mm 3 /(N m)). Moreover, coatings obtained by means of PEO and polymer dispersion dipping possess hydrophobic and superhydrophobic properties. Such multifunctional coatings have high corrosion resistance and good friction coefficient under dry wear conditions that extends the application field of magnesium alloys.
Highlights
Plasma electrolytic oxidation (PEO) is an advanced surface modification process, which leads to the formation of similar to ceramic and well-adhered coatings on the valve metals such as aluminium, magnesium, titanium, and a wide range of their alloys [1,2,3,4]
The post-treatments are often applied in order to seal the pores and improve the protection effect in practical industrial applications where the PEO-layer is used as a base for composite coating formation [5,6,7]
This paper describes the results of investigation of protective properties of multifunctional composite coatings (CC) on magnesium alloys with various polymer
Summary
Plasma electrolytic oxidation (PEO) is an advanced surface modification process, which leads to the formation of similar to ceramic and well-adhered coatings on the valve metals such as aluminium, magnesium, titanium, and a wide range of their alloys [1,2,3,4]. There are many advantages of PEO-coatings, such as a high hardness, corrosion and wear resistances and biocompatibility. PEO-layers provide better protection than conventional anodic oxide films, which makes PEO suitable for many industrial applications. In spite of many advantages, the PEO-coatings can have structural defects such as cracks and pores, which could dramatically reduce the corrosion resistance of even relatively thick coatings. The post-treatments are often applied in order to seal the pores and improve the protection effect in practical industrial applications where the PEO-layer is used as a base for composite coating formation [5,6,7]
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