Generation of Multifunctional Oxide Coatings on Surface of Val10 Alloy in a Polysilicate Solution

Abstract

Experiments on the effective deposition of an oxide-ceramic coating on cast aluminum alloy VAL10 have been carried out, alloowing quick application of hardening coatings that minimize main disadvantages of aluminum alloys, such as low strength and surface hardness. Protective coatings were applied using a LIS-25 laser device with a laser radiation wavelength of 1.06 μm. The substrates had dimensions of 10x10x3 mm. Laser treatment of the samples was carried out in a solution of polysilicate Na2SiO3 of various concentrations. Empirically, the optimal concentration of the solution was clarified. The chemical composition of the prepared sample surface was studied by Auger electron spectroscopy. A JAMP-10 S setup (JEOL, Japan) was used as an Auger microanalyzer. A control sample with treated in air surface was made for comparison. The composition of the coating obtained in a solution of polysilicate, in addition to aluminum, includes: carbon, calcium, oxygen, sodium, silicon. In the form of Auger lines, aluminum is in an oxidized state, and carbon and silicon are in the form of carbide. The coating obtained in a polysilicate solution has significant differences from the coating obtained in air. The coating obtained in a polysilicate solution has a more uniform structure, less roughness, and there are no characteristic craters from laser radiation exposure.