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Magnesium coatings were fabricated on stainless steel substrates (1Cr11Ni2W2MoV) by a plane magnetron sputteringtechnique. The argon pressure and the substrate condition (including temperature and the substrate was rotated orfixed) were varied in order to evaluate the influence of the parameters on the crystal orientation and morphology of thecoating. The corrosion behavior of the coatings in 1 wt pct NaCl solution was studied by electrochemical methods.The results showed that all coatings exhibited preferred orientation (002) as the argon pressure increased from 0.2 to0.4 Pa. The morphologies of the coatings varied with the argon pressure and with whether the substrate was rotatedor fixed. The open circuit potential of the coatings was more positive than that of cast AZ91D magnesium alloy.However, the immersion test in 1 wt pct NaCl solution showed that the corrosion rates of the coatings were higherthan that of cast AZ91D magnesium alloy.