Bright Tin Plating Method And Requirements For Push-in Terminals

The metal contacts of push in terminal undergo bright tin plating. Bright tin plating is achieved by adding a brightener to the plating solution and using organic additives to form a fine-grained structure, resulting in a mirror-like finish.

After bright tin plating, push in type terminal block should undergo cleaning and drying processes to remove plating residue and prevent organic matter from remaining on the tin layer surface. A well-adhered and smooth tin layer reduces insertion force in push-in structures, making wire insertion smoother and ensuring low and stable contact resistance.

push in terminal block wire connector When inserting a wire or wire sheath, the bare wire end or the conductor end of the sheath must be in full contact with the bottom of the solder layer, and must not only contact the edge of the solder layer. The bright tin plating must cover the conductor contact area to form a complete metal contact surface.

In production batches, bright tin plating push connector block should undergo reliability tests such as mechanical vibration and temperature cycling to observe whether the tin layer remains intact under long-term vibration or temperature rise conditions, without peeling, discoloration, or tin whisker formation.