Frictional Behaviour of Composite Anodized Layers on Aluminium Alloys

Abstract

Three variants of the micro arc oxidation (MAO) technique have been used to treat a 2017A alloy surface. The first variant was a pure anodized layer, the second an anodized layer with SiC embedded nanoparticles and the third an anodized layer with Si3N4 nanoparticles. Tribological tests were performed for all variants, on three samples for every case. Friction coefficients and wear rates were calculated on the basis of experiments. The pure anodized layer manifested friction coefficient values within the range of 0.48 ÷ 0.52 and a wear rate in the range ~10−15 m3N−1m−1. SiC nanoparticles improved the tribological properties of the layer, as indicated by a reduction of the friction coefficient values to the range of 0.20 ÷ 0.26 with preserved very high resistance against wear (wear rate ~10−15 m3N−1m−1). Si3N4 particles embedded in anodized layer deteriorated the tribological properties, with a reduction in the resistance against fatigue and wear, intensification of friction forces and a change in the nature of friction contact behavior to more a abrasive-like nature (friction coefficients ranging from 0.4 to 0.6 and wear rates ~10−14 m3N−1m−1).

Tribological properties of aluminum alloy coated with graphene oxide/polyvinyl alcohol composites after micro-arc oxidation

“…As shown in Figure 7(d), the average friction coefficient histogram under different lubrication conditions can be seen more intuitively that the GO–PVA composite film shows better tribological properties on the aluminum alloy sample treated by MAO under the condition of oil lubrication (Arrabal et al. , 2015; Atraszkiewicz et al. , 2020).…”

Excellent Lubricity of PVA/PEG/CS Composite on Ceramic Surface and Stainless Steel Friction Pair

“…[1] However, aluminum also has many disadvantages, such as poor wear resistance, ease of corrosion, [2] and ceramic coating treatment on the surface of aluminum material which can significantly improve its disadvantages. [3] However, as the surface hardness increases, the roughness of the surface will also increase, and the more severe the damage caused to its friction substrate. Frictional wear is one of the main causes of machine parts and machine failure [4,5] and has caused substantial economic losses in the machinery lubrication industry over the past decades because of the effects of wear.…”

Effect of SiC addition in electrolyte on the microstructure and tribological properties of micro-arc oxidation coatings on Al-Mg-Sc alloy

“…Ren et al [21] proved that the incorporation of submicron SiC particles decreased the friction coefficient and wear rate of the MAO coatings prepared on Ti alloy. Radomir et al [22] found that SiC nanoparticles directed affected the nature and intensity of wear during the tribological tests and caused an improvement of the tribological properties of the MAO coating on 2017A aluminium alloy. Chang et al [23] found that the MAO coating on Mg alloy AZ31 in silicate electrolyte with SiC nanoparticles showed an enhanced wear resistance.…”