[Introduction] A cyanide-free copper electroplating process for aeroengine needs to be developed to meet the requirement of environment protection. [Method] The properties of cyanide-free copper plating bath and cyanide-based copper plating bath were compared in terms of cathodic current efficiency, covering power, throwing power, and deposition rate. The excellent properties of copper coating electroplated from the cyanide-free bath were verified by comparing its appearance, adhesion, impermeability, and hydrogen embrittlement with the copper coating electroplated from the cyanide-based bath. [Result] All the said properties of the cyanide-free bath were comparable to those of the cyanide-based bath, and the properties of Cu coating obtained from it met the requirements of the aviation standard HB/Z 5069-2011. [Conclusion] The cyanide-free copper electroplating process in this study can replace the cyanide-based one, meeting the needs in manufacturing of aeroengine parts.
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