The corrosion
behaviour of coatings was examined by cyclic potentiodynamic polarization test. Results showed that in all samples, in the range
of selected laser parameters, the interface between coating and substrate remains after the LST. The density of porosity on surface
and cross-sectional area is reduced by about 75% in hybrid coatings of laser treated PEO (L-PEO) compared to PEO coatings. By
an increase in pulse duration, deep cracks appear and transport electrolytes to substrates; therefore, the corrosion resistance of
coatings are decreased.