Herein, an efficient strategy is proposed to prepare the ultrahigh-strength polymer–metal hybrids (PMHs) using direct molding bonding. The key to this strategy is the 355 nm ultraviolet (UV) laser treatment on the metal surface. Compared with traditional chemical or electrochemical treatments, laser treatment is much more efficient and environmentally friendly, and it is no doubt more promising. A square grid scanning of laser beam is designed. The bonding strength of PMHs, which is strongly related to the line spacing of laser scanning, can achieve up to 22.4 MPa when the line spacing is 30 μm. The super depth of field 3D microscope shows that the depth of the laser-etched grooves is 22–29 μm, and the average width is 17 μm. Scanning electron microscope (SEM) confirms that the polymer and the metal's actual bonding points are exactly the position of the grooves etched by laser. X-ray photoelectron spectroscopy (XPS) reveals that the laser just destroys the Al₂O₃ film on the Al alloy surface and exposes a portion of the metallic Al. The mechanism to obtain a direct bonding with ultrahigh strength is that grid-shaped micron-level rivets are formed as a whole frame at the bonding interface, providing the large-area mechanical interlocking between the polymer and metal.

中文翻译：

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具有超高强度的聚合物和金属直接粘合：激光处理和机械互锁

在这里，提出了一种有效的策略，可以使用直接成型粘合来制备超高强度聚合物-金属杂化材料（PMH）。该策略的关键是在金属表面进行355 nm紫外线（UV）激光处理。与传统的化学或电化学处理相比，激光处理更有效，更环保，而且无疑具有更大的前景。设计了激光的方格扫描。与激光扫描的行距密切相关的PMH的结合强度在行距为30μm时可以达到22.4 MPa。超景深3D显微镜显示，激光蚀刻的凹槽深度为22–29μm，平均宽度为17μm。扫描电子显微镜（SEM）确认聚合物和金属 实际的结合点恰好是被激光蚀刻的凹槽的位置。X射线光电子能谱（XPS）显示，激光只是破坏了Al在铝合金表面上形成₂ O ₃膜，并暴露出一部分金属Al。获得具有超高强度的直接粘合的机制是，在粘合界面处将网格状的微米级铆钉作为一个整体形成框架，从而在聚合物和金属之间提供大面积的机械互锁。