Effects of Surface Structure and Hydrogen on the Fatigue Strength of Electroless Nickel-Phosphorus Plated Al-2%Cu Alloy

Abstract:

In this study, the effect of the surface structure and hydrogen on the fatigue strength of electroless Ni-P plated Al-2%Cu alloy was investigated. As the results, the following points were clarified. Large precipitates were recognized near the specimen surface of the furnace-cooled Al-Cu alloy, but these were not recognized in the aged Al-Cu alloy. Fatigue strength of the Al-Cu alloy specimen subjected to Ni-P plating after a furnace cooling treatment was overall reduced rather than one of the non-processed specimens. Fatigue strength of the Al-Cu alloy specimen subjected to Ni-P plating after the aging treatment showed a clear increase in comparison to one of non-processed materials. In the Al-2%Cu alloy specimens subjected to Ni-P plating after the furnace cooling treatment or aging treatment, a clear hydrogen desorption was recognized. On the other hand, there was only hydrogen desorption from a few of the non-processed specimens. It is considered that the poor fatigue strength of the plating materials is mainly due to the interaction between the surface precipitates and hydrogen gas.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1821-1826
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1821
• Online since: December 2018
• Authors: Teruto Kanadani*, Norihito Nagata, Keitaro Horikawa, Keiyu Nakagawa, Makoto Hino
• Keywords: Aging, Al-Cu Alloy, Fatigue Strength, Hydrogen Gas, Ni-P Plating, Surface Precipitate

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