The Ni-5%Al alloy and Ni-5% Al-Al2O3 composite coatings were obtained by a flame spraying method, “Casto-
Dyn DS 8000” torch was used. The coatings onto a substrate made of austenitic stainless steel (X5CrNi18-10) were
sprayed. The coatings were subjected to turning, burnishing and grinding. The evaluation of corrosion properties
were based on the measurements of direct current (potentiodynamic method) and the alternating current (EIS
method). Corrosion tests were performed in a 3.5% sodium chloride solution.
On the basis of studies, the effect of finishing type on the corrosion properties of flame sprayed coatings has been
demonstrated. The lowest corrosion current density was found for Ni-5%Al coatings after burnishing, icorr value equal
to 0.76 μA/cm2, and the charge transfer resistance was 31063 Ω/cm2. The lowest resistance to corrosion of grinded
Ni-5%Al-Al2O3 composite coatings was observed. These coatings were characterized by the following parameters of
corrosion process: icorr = 14.01 μA/cm2, Rct = 3260 Ω/cm2.
Burnishing caused increased corrosion resistance of both coatings. Due to reduced roughness and waviness are
obtained reduction of the area of the actual burnished coatings compared to turned coatings. Thus, it is resulting in
reduced values of corrosion current density.
After finishing treatment, the thermally sprayed Ni-5%Al-15%Al2O3 coatings characterized by lower corrosion
resistance compared to the alloy coating. The presence of the reinforcing phase in the coating promotes the increase
of the porosity. Burnishing does not cause a significant change in porosity of the coating. The flame sprayed coatings
on nickel-based have a tendency to localized corrosion in seawater environment.
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