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Abstract
Stainless steel 304L coatings were deposited at a low temperature on AZ31B magnesium alloy by magnetron sputtering, both with and without the use of Ar+ ion bombardment during deposition. Energy dispersive spectroscopy tests showed that the elemental composition of stainless steel sputtered on magnesium alloy is similar to the elemental composition of the stainless steel target for the two investigated processes regardless of the method of deposition. The measurements of polarisation and corrosion current density indicated that the 304L stainless steel coatings on AZ31B magnesium alloy showed excellent corrosion properties for the coatings deposited only when using Ar+ ion bombardment during deposition. X-ray diffraction (XRD) studies indicated that stainless steel 304L has a face centred cubic structure composed of Fe, Cr and Ni atoms, whereas the magnetron sputtered coating on the AZ31B substrate has a body centred cubic structure (bcc) with a crystallite size of ∼16 nm regardless of the method of deposition. The XRD peak Fe 110 is shifted towards lower diffraction angles, which may indicate formation of a solid solution of chromium in iron as the atomic radius of Fe in bcc structure (0·1241 nm) is lower than that of Cr (0·1243 nm).