Electrodeposition of a roughened copper coating onto steel was carried out to produce a bonding surface for thermoplastic resin (polyphenylenesulfide). The roughened copper film was electrodeposited using a copper sulfate bath containing polyacrylic acid (PAA). Following injection molding of the resin, the bonding strength was evaluated in a tensile lap shear strength test, followed by durability testing at high temperature and humidity (85 ± 2 °C and 85 ± 2% relative humidity, respectively) for 2000 h, and a thermal shock test (−50 °C–150 °C) for 1000 cycles. An analysis of the boundary microstructure showed that the PAA concentration had a large effect on the surface morphology of the copper film. The shear strength of the joint between the coated steel substrate and the resin was more than 40 MPa, and the bonding strength also remained above 40 MPa throughout the durability test. During the thermal shock test, although the bonding strength gradually decreased with increasing number of cycles, it remained at over 20 MPa, even after 1000 cycles. This method achieves not only high initial bonding strength, but also durability for joints between dissimilar materials such as steel and resin.

中文翻译：

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钢与热塑性树脂异种连接的钢表面粗糙电沉积铜涂层的制备

进行在钢上的粗糙化的铜涂层的电沉积，以产生用于热塑性树脂（聚苯硫醚）的粘合表面。使用包含聚丙烯酸（PAA）的硫酸铜浴对粗糙的铜膜进行电沉积。树脂注塑成型后，在拉伸搭接剪切强度测试中评估粘合强度，然后在高温和高湿（分别为85±2°C和85±2％相对湿度）下进行2000小时的耐久性测试，以及进行1000次循环的热冲击测试（−50°C–150°C）。边界微观结构的分析表明，PAA浓度对铜膜的表面形态有很大的影响。涂层钢基材和树脂之间的接合点的剪切强度大于40 MPa，在整个耐久性试验中，粘结强度也保持在40 MPa以上。在热冲击试验中，尽管结合强度随着循环次数的增加而逐渐降低，但即使经过1000次循环，其结合强度仍保持在20 MPa以上。该方法不仅实现了高初始粘合强度，而且还实现了异种材料（例如钢和树脂）之间的接合处的耐久性。