钢铁基体上置换镀铜工艺研究

Chemical Replacement Copper Plating on Iron and Steel

为了提高钢铁基体上化学置换镀铜的结合强度,采用原子力显微镜与电化学测试相结合的方法,研究了H2SO4-CuSO4体系置换镀铜工艺。结果表明,在该体系中加入高效添加剂可抑制置换反应的速度,控制铜的结晶过程,在2～3s内在铁基体上获得0.1～0.3μm厚、结合强度高的致密铜层,进一步通过专用钝化剂处理后,能够满足CO2气保焊丝、轮胎钢丝等线材镀铜的工艺要求。

Galvanic current-time test, polarization curve measurement, and atom force microscopic observation were conducted to analyze the process of chemical replacement copper plating for iron and steel in H2SO4-CuSO4 bath, aiming at increasing the bonding strength of the copper plating. Results indicated that the introduction of highly efficient additives decreased the dissolution speed of Fe anode and retarded the crystallization of copper, generating copper plating with good bonding strength and thickness of 0.1-0. 3 μm within 2-3s. After introducing specifically designed passivation agents, the Cu plating process could be readily used for CO2 gas shield welding wire arid tyre wire steel as well, and the resulting Cu coating had improved antirust ability.