writer：Shuya Yin, Yi Xie, Ruilong Li, Jihai Zhang, and Tao Zhou*
keywords：Nano-rivets; mechanical interlocking; electrochemical treatment; polymer-metal; direct bonding
source：期刊
Issue time：2020年
This study fabricated polymer-metal hybrid (PMH) materials with an ultra-high-strength using an effective electrochemical treatment strategy and the direct molding bonding. It is found that the bonding strength of the prepared PMH between polymer and metal reached as high as 21.0 MPa. Characterizations revealed the formation of a new multi-nanoporous Al2O3 layer on aluminum (Al) alloy after electrochemical treatment. The thickness of Al2O3 layer was 6.2-15.3 μm, and nanopores with an average diameter of 7.8-14.3 nm were parallel distributed throughout the whole Al2O3 layer. The formation of countless nano-rivets brings a large-area mechanical interlocking at the interface between the polymer and Al alloy, which is thought to be the key mechanism of achieving an ultra-high strength. At the optimal treatment voltage of 18 V, the maximum mechanical strength of the PMH material was obtained, and the corresponding number of the formed nano-rivets was 5.75×1010 in theory. Besides, the average size of nanopores was 14.3 nm. Compared to the traditional chemical treatments, the electrochemical method is no doubt a more prospective way.