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Abstract
In order to obtain a dense thin coating film and improve corrosion resistance of coating steel CrN thin film deposited on 0.37wt%C steel with multi-stage PVD method was studied. From an anodic polarization test in aerated 2% F^SC^ solution, the steel coated with the multi-stage method showed better corrosion resistance than the specimen coated with a common method . This is due to the decrease of small defects in the coating film by means of multi-stage deposition. Evaluation of corrosion fatigue strength on the multi-stage coating steel was performed under cantilever-type rotating bending fatigue test in 3% NaCl solution. From the experimental results, corrosion fatigue strength improved with the multi-stage coating as compared with those without coating. But an effort to improve corrosion fatigue strength was less in the multi-stage deposition than the common one, by contraries to the expectation of corrosion resistance obtained from the anodic polarization test.
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