Abstract
A plasma electrolytic oxidation (PEO) coating fabricated on AZ31 Mg alloy was sealed with polymeric sealant. The sealant penetrated into the PEO coating and filled the micropores and microcracks of the coating. The effect of the sealant treatment on the sliding wear behavior of the PEO coating was investigated by systematically varying the axial wear loads applied onto the unsealed and sealed PEO coatings. The results of the sliding wear tests revealed that the polymeric sealing treatment enhanced the wear resistance of the Mg-based PEO coating by reducing the wear rate and by improving the load-bearing capacity.
Highlights
Mg and its alloys are extensively utilized in many fields due to its lightweight and outstanding properties [1,2]
In order to eliminate the influence of the resin layer on the sliding wear process, the coating after sealing treatment was ground on 1000 mesh and 1500 mesh sandpapers in order to ensure that the excess resin layer on the surface of Plasma electrolytic oxidation (PEO) film was completely removed
The Mg-based PEO coating fabricated in silicate electrolyte was mainly composed of
Summary
Mg and its alloys are extensively utilized in many fields due to its lightweight and outstanding properties [1,2]. The polymeric sealing treatment is a simple, easy, low-cost and effective post-coatingtreatment to seal the surface of the Mg-based PEO coatings, which can significantly enhance their mechanical and corrosion properties [11,12,16]. Dichtol WFT (1532) type sealant was chosen (main component: ketone), sinceit is a fast-curing capillary sealer that can impregnate micropores and hairline cracks without the need for vacuum or pressure It is commonly applied onto thermal sprayed coatings, which results in an excellent sealing effect [21]. In this work, this sealant with ketone as the main component was used to seal the AZ31 Mg–PEO coating, having similar pores and cracks as that of the thermal sprayed coatings to some extent This investigation is mainly intended to explore the effect of sealing treatment on the sliding wear behavior of the AZ31 Mg–PEO coating
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