Zhuji Huaxin Electroplating

Zinc plating is judged by how long the plated part survives neutral salt spray before white or red rust appears. A high salt-spray specification means the coating thickness, the passivation type and any post-treatment are chosen to reach a longer test duration than a standard commercial finish. The hours are agreed against the drawing — the figure is a test result on the actual part, not a catalogue number.

Blue-white and coloured (yellow / rainbow) passivation are both run. The choice is made on appearance and on the corrosion requirement, and it is confirmed before the batch starts.

Yes. Where the part is high-strength or spring-tempered, dehydrogenation baking is carried out after plating to reduce hydrogen embrittlement risk. The requirement has to be stated on the drawing or in the RFQ, because it adds a process step and time.

Yes — the company is registered for metal surface treatment and pickling, and runs pickling as part of its own process line.

The plating requirement is reviewed together with the part drawing before tooling: coating thickness, masking needs, hydrogen embrittlement risk and the dimensional effect of the coating are considered in the process and inspection plan. Plating is then scheduled against the production plan.

Yes, and it is declared as such — together with heat treatment, passivation, electropolishing, phosphating, electrophoretic coating, liquid painting and slow-wire EDM.