Abstract
The rotating bending fatigue tests were conducted using wrought magnesium alloy AZ80 with multi-layered DLC film in the laboratory air and in the pure water and the effect of the number of layers and the thickness of the DLC film on fatigue behaviour of the material under corrosion environment was investigated. It is clarified that the multiple and/or thick DLC film is effective to improve the fatigue strength under corrosion environment; however the single and/or thin DLC film is not. It is attributed to the defects in DLC film. In the single and thin DLC film, defects of which the size is 20〜30 μm exist and penetrate to the parent material; however in the multiple and thick DLC layer, defects which penetrate to the parent material were scarcely observed and the DLC layer could fully coat a specimen.-
