Investigation of corrosion and wear resistance of PEO coated D16T aluminium alloys in the marine tropical climate conditions

Abstract

The effect of critical technical parameters such as the current density ratio between anode and cathode (ianode/icathode) and composition of the electrolyte solution on the morphology, structure, phase formation, hardness, abrasion, and corrosion resistance of D16T aluminum alloy with plasma-electrolytic oxidized (PEO) coatings was studied. The research results show that the properties and morphology of the obtained coatings are different when the technological regime is changed, and substances are added to the basic electrolyte solution. Aluminum oxide, silicon oxide, cobalt oxide, and manganese oxide are the critical components of the coatings, which are split into an outside porous technical layer and an interior denser working layer. The coating obtained from the base electrolyte with Co(OH)2 has the best properties, morphology, and the highest corrosion resistance.