140MXC (based on Fe, W, Cr, Nb), 530AS (AISI 1015) and 560AS coatings (AISI 420) were deposited on AISI 4340 steel using the electric arc thermal spray technique and the same deposition parameters and were evaluated for corrosion re-sistance.
The 140MXC monolayer and bilayers proved to have very simi-lar polarisation curves, thus indicating that the electrolyte mainly interacted with the top bilayer. This suggested that combining 140MXC wire with carbon or stainless steel wire would not lead to a reduction in an industrial application’s corrosion resistance.
Moreover, the simultaneous monolayer’s polarisation curve differed from its precursors and did not agree with the mixed potential theory; further investigation of corrosive phenomena is thus needed, using another technique, for instance electrochemi-cal impedance spectroscopy.