Effect of anodized coating on fretting fatigue characteristic of 6063 aluminum alloy

摘要

Wear, scratch, plain fatigue and fretting fatigue tests were carried out using aluminum alloy JIS 6063-T5 specimens with anodic film and lubricating anodic film. Though the surface hardness of lubricating anodic film was lower than that of anodic film, lubricating anodic film had excellent wear resistance and crack resistance compared to anodic film. Plain fatigue strength of the specimen with anodic film was lower than that of the specimen with lubricating anodic film, which almost coincided with that of the specimen without film. Fretting fatigue strength of the specimen with lubricating anodic film was higher than that of the specimen with anodic film, which was higher than that of the specimen without film. The lubricating anodic film had the lowest coefficient of friction and a higher cracking resistance, which contributed to the late crack initiation and the low crack growth rates. The anodic film also had low coefficient of friction compared to the specimen without film and prevented metal-contact, which may result in higher fretting fatigue strength compared to the specimen without film. The lubricating anodic film is of significant benefit to fretting fatigue strength without degradation of plain fatigue strength.