1. The chemical composition of copper ingot was determined by imported spectrometer.
2. Cut a copper ingot, polish the set process section and conduct visual inspection.
3. High ammonium sulfate solution was prepared according to the formula to detect the microstructure of copper ingot.
4. Take the copper solution from the smelting process for cup-shaped detection of the surface of the copper ingot.

The hardware faucet produced by this product can be directly electroplated with chromium after polishing, which greatly reduces the cost and improves the production efficiency.