Electroplating of Hardware Screw Fasteners to Master Four Points to Control Quality
2024-08-02
Electroplating of Hardware Screw Fasteners to Master Four Points to Control Quality.
1. Appearance: Hardware screw products are not allowed to have local plating, burning, rough, gray, peeling, crust and obvious stripes on the surface. Pinhole pitting, black slag plating, loose passivation film, cracking, falling off and serious passivation marks are not allowed.