Influence of aluminium oxidation on insulation properties of oxide coating

Abstract

The article presents the influence of aluminium oxidation parameters on the insulating properties of oxide coatings on aluminium strips of electrical windings. The effect of H 2 SO 4 electrolyte concentration, its temperature and anode current density on the value of unit breakdown voltage was determined. A significant influence of the contact surface area of the measuring electrode with the coating on the breakdown voltage was found. The error of breakdown voltage measurement does not exceed 5% if the contact surface area of the electrode is a minimum of 10 cm 2 . Constant and varying components of the breakdown voltage were distinguished. The constant component is up to 55% of the value and depends mainly on the thickness of the coating. The varying component depends on the surface topography of the oxide, mainly on the number of roughness peaks per unit area.

Remanufacturing a Synchronous Reluctance Machine with Aluminum Winding: An Open Benchmark Problem for FEM Analysis

“…For example, 1050 is aluminium with a minimum purity of 99.5%, and it maintains a high corrosion resistance [21]. It is also possible to use an electrolytic oxide coating on aluminium for low-voltage electric insulation, which also has the advantage of protecting the aluminium from further corrosion [22,23]. The price of aluminium and copper showed historically similar trends between 2011 and 2021, but the cost of aluminium is significantly lower by ∼67% [24].…”

DOE Application for Analysis of Tribological Properties of the Al2O3/IF-WS2 Surface Layers

“…Aluminum alloys have high friction coefficient wherefore without appropriate surface treatment it is unsuitable as friction material. To improve poor wear or/and corrosion resistance of aluminum, various methods such as hard anodizing [1][2][3][4], sol-gel coating [5,6], lubricating additives [7,8], anodic oxidation [9][10][11] and polymer coating [12,13], have been applied. The tribological partner in the sliding nodes can be a plastic (for acetabular bearings, guides and seals) with selected properties improved in different directions.…”