1. Current density: generally refers to the current value passing through the surface of the electrode (such as electroplating parts) unit area, and A/dm2 is usually used as the unit of measurement.
2. Polarization: Usually refers to the phenomenon that the electrode potential deviates from its average potential when a direct current passes through the electrode. Under the benefit of current, the electrode potential of the anode shifts in the positive direction, which is called anodic polarization; the electrode potential of the cathode shifts to the negative direction, which is called cathodic polarization.
3. Hydrogen embrittlement: In the process of electrochemical degreasing, strong corrosion, hard chromium electroplating, etc., the recovered one-sided hydrogen penetrates the base metal or the coating in the state of atomic hydrogen to cause stress, which makes the base metal and the coating tough The phenomenon of brittleness occurs due to decline.
4. Coating roughness: due to improper control of main salt concentration, bath pH, ??temperature and current density, as well as excessive solid impurities, the coating crystals are coarse and small.
5. Pockmarks: due to excessive heavy metal or organic impurities in the hard chromium electroplating bath, insufficient wetting agent, abnormal pH value and other reasons, the plating layer appears fine pits, sharp protrusions or large pores.
6. Blooming: Due to the increase agent, especially the imbalance of the brightener, too much organic impurities, poor cleaning between processes, and improper control of temperature and current density, the color of the coating is uneven, small pieces of gray, and dark.
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