In the actual production process, the impact of the speed and quality of galvanized common factors are: (1) Pre-treatment is not thorough.
The surface of the workpiece has oxide film, which affects the normal deposition of zinc. (2) Poor conductivity.
The current is consumed on the wire, and the current allocated to the workpiece surface is too small. (3) High carbon content of the workpiece.
High carbon steel, iron castings, etc. will reduce the hydrogen precipitation potential, the workpiece surface hydrogen acceleration, the current efficiency is reduced. (4) The workpiece is lashing too tight.
When galvanized, the workpiece is partially shielded and the coating is too thin. (5) The bath temperature is low.
When the plating liquid temperature is low, the current density of distribution is correspondingly reduced, and the deposition speed of the coating is reduced inevitably. (6) The content of sodium hydroxide in plating bath is high.
When the content of sodium hydroxide is high, the current efficiency decreases correspondingly. (7) The content of the additives in the plating bath is low.
The low content of the additive can affect the dispersion ability, and the coating is too thin locally.
(8) The area of the plating is not estimated, the current density of distribution at the time of plating appears too small.
(9) The workpiece suspension method is improper, and the zinc anode spacing is too large, should adjust the position. (10) The workpiece is too corroded. Reducing the hydrogen precipitation potential, the surface hydrogen accelerating current efficiency of the workpiece is reduced, thus affecting the deposition rate of zinc.
Should be in the pickling solution to add an appropriate amount of corrosion inhibitor, the local oxidation of the skin is thick first by mechanical method to remove, pickling process for more inspection. (11) Anode passivation.
The effective area is reduced, which affects the normal distribution of current. (12) The content of sodium hydroxide is relatively low. If the sodium hydroxide content is low, the current density is not high, anode passivation.