How to judge the cause of pinholes in the nickel plating layer

The defect of pinholes in the nickel plating layer is relatively common, which not only affects the decorative effect, but also reduces the protective performance of the plating layer. There are many reasons for pinholes, and careful observation of the parts and conditions of pinholes is helpful to determine the cause.

(1) Dense pinholes are generated in the local area of u200bu200bthe plated parts, and there are no or almost no pinholes in the remaining parts, which are generally caused by poor pre-plating treatment, and there are oil stains, water-repellent films, oxides, etc. on the local surface of the parts.

(2) There are pinholes in the plating layer on the bottom of the plated parts, which are often caused by the adsorption of organic impurities and inclusion on the surface of the plating layer, making this part hydrophobic and gas easily staying in this part.

(3) The plated parts are coated with pinholes on the upper side, which are usually caused by dense non-conductor suspensions that settle there, making the coating rough.

(4) There are pinholes in the high current density area of u200bu200bthe plated parts, which are caused by excessive dissimilar metal impurities, insufficient boric acid content, high pH value of the solution or excessive current density, resulting in dissolution of dissolving metal impurities in water Hydroxide or basic salt is included in the coating, making the coating rough and bubbles are easily adsorbed on it.

(5) There are pinholes in all parts of the coating, which are often caused by insufficient anti-pinhole agents.