Wear-resistant and corrosion-resistant composite coating on surface of high-end connector and preparation method thereof

The invention belongs to the technical field of metal surface treatment, and particularly relates to a high-end connector surface wear-resistant and corrosion-resistant composite coating and a preparation method thereof. Comprising the following steps: carrying out pretreatment on the surface of the connector, sequentially carrying out chemical nickel layer plating, gold layer electroplating, rhodium layer electroplating or iridium layer electroplating according to a composite coating structure, cleaning, and drying to obtain the wear-resistant and corrosion-resistant composite coating on the surface of the high-end connector. The surface of the connector is firstly plated with the nickel layer, the substrate can be well blocked, outward diffusion of the substrate bottom of the connector made of copper and alloy materials of the copper is avoided, the nickel layer can be firmly attached to the surface of the substrate, the stability of the composite coating is ensured, and the upper coating is prevented from