Direct potassium galvanizing after activation
The composition and process conditions of galvanizing solution are the same as those of galvanizing solution for commonly used iron and steel workpieces, and it can be used with Bigely potassium salt galvanizing process BZ-528, which is divided into two kinds of softening agent and brightening agent, and it can be added according to the proportion of the product specification in the production.
A few common considerations
Since the rare earth NdFeb alloy substrate is very prone to corrosion in the weakly acidic plating solution, the electroplating factory should increase the current density as much as possible when it is galvanized at the beginning to avoid the poor binding force between the coating and the substrate (due to matrix corrosion).
The current density is different from the plating time, rolling plating and hanging plating.
In addition to the difference in time and cathode current density between the process conditions of roll plating and rack plating, the content of zinc chloride in the composition is not the same, and it is lower in roll plating. Roller speed 6~8r/min; time depends on the thickness of the coating, generally 40~60 mins.
Special emphasis here is the corrosion resistance of the high and low with the galvanized layer itself has a great relationship, some electroplating plant from the economic considerations, potassium salt zinc plating process will be used in the production of cheap low-quality brightening agent, resulting in the plating layer due to the inclusion of organic decomposition products and reduce the corrosion resistance, it is difficult to achieve the blue and white zinc for 24 hours, color zinc for 72 hours of neutral salt spray test does not come out of the requirements of the black spot, blue and white zinc passivation, such as the use of special protective agent treatment, you can further increase the corrosion resistance of the product.
How to choose the right brightener
To solve this problem, you can use Bigely potassium chloride galvanizing brightener BZ-528, because of its good stability, will not be easily decomposed, so as to reduce the organic impurities on the plating solution and coating contamination, on the one hand, can improve corrosion resistance, on the other hand, can reduce the plating layer of the dark fog, passivation is not bright after the problem.
During the galvanizing process, do not add too much potassium chloride galvanizing brightener. Otherwise, it is very easy to cause the edges of the product to become brittle and peel off.
After the galvanized layer has been washed, it is subjected to the usual post-treatments: passivation, drying and immersion in masking coatings.
If you want to purchase Potassium Chloride Galvanizing Brightener, please feel free to contact us.
