Measures to Improve the Dispersion Ability of Fastener Galvanizing Solution

The dispersion of the fastener galvanizing solution mainly refers to the dispersing ability of the electrolyte, which is the ability to obtain a uniform coating on all parts of the workpiece under the condition that the distance between the anode and the anode in the electrolyte is unequal. It is the process of evaluating the electrolyte. An important indicator of the quality of the formulation and coating. How to maintain and improve the dispersion ability of electrolyte in daily work is an important research object of electroplating workers. The following are ten measures to improve the dispersibility of the fastener galvanizing solution.

Measures 1. Take shielding cathode. For workpieces that are complex in shape and cannot use auxiliary anodes, the method of shielding the cathode can be adopted, that is, the protruding part of the tip is protected, so that the current intensity can be increased, the current density of the deep concave part can be increased, and the electrolyte dispersion ability can be improved. purpose.

Measure 2. Adopt auxiliary anode. Adopting an auxiliary anode is an effective method to improve the dispersion ability of the electrolyte, which can make the concave part of the workpiece obtain the opportunity of ion discharge at the same time. In mass production, only the insulation problem between the cathode and the anode is handled, and the anode and the anode are assembled together. , The operation is also very convenient. (Guide: Microstructure and depth of decarburization layer of high-strength and high-quality spring steel)

Measure 3. Expand the distance between the cathode and anode. Enlarging the distance between the anode and the cathode can reduce the proportion of the distance between the convex part and the concave part of the workpiece and the anode, which is beneficial to the smooth deposition of the zinc layer on the concave part. The specific operation method: move the position of the cathode bar and deflect the cathode bar to the opposite pole.

Measure 4. Change the hanging direction of the workpiece. When rack plating, the deep concave surface is deliberately facing the anode, so that the power lines can be evenly distributed, so as to obtain the opportunity of ion discharge at the same time.

Measure 5. Increase the anode area. The ratio of the anode area to the anode area of u200bu200bzincate zinc plating is 1:2. Insufficient anode area is prone to passivation. At this time, the effective anode area is further reduced, which affects the conductivity and the required current density, and then affects the dispersion ability of the electrolyte. .

Measure 6. Distribute anodes reasonably. A reasonable distribution of anodes is also the key to improving the dispersion ability of the electrolyte. During operation, the anodes should be distributed according to the shape of the workpiece, and the anodes should be concentrated on the concave part of the workpiece, away from the convex part of the workpiece, so as to adjust the current density of different parts and different requirements. the goal of. Increasing the current density of the concave surface is beneficial to improve the dispersion ability of the part; reducing the current density of the convex surface is also beneficial to avoid the possibility of scorching the part.

Measure 7. Use impulse current. In the initial stage of the workpiece being hung in the plating tank, a current that is twice the normal current density is used for impact. This method can make the parts that are not easy to sink the plating layer first sink a thin layer of zinc, and then apply the thin layer of zinc when the normal current density continues to be plated. It is easy to deposit zinc, that is, under normal current density conditions, the deposition of zinc on zinc is easier than the deposition on the surface of steel, otherwise it may not be plated eventually.

Measure 8. Take moving cathode. Moving the cathode can appropriately increase the current density, which is also conducive to improving the dispersion ability of the electrolyte. The protruding part of the tip is not easy to scorch. If the plating tank is not equipped with a cathode moving device, it can be replaced by shaking the workpiece manually.

Measure 9. Maintain a normal additive concentration. Containing a proper amount of additive concentration in the electrolyte can expand the current density range, and can significantly improve the dispersion and coverage of the plating solution.

Measure 10. Adjust the ratio of zinc oxide to sodium hydroxide. When the zinc ion content in the plating solution exceeds the concentration of the sodium hydroxide ratio in the process formula, it will affect the dispersion ability of the plating solution. At this time, it should be adjusted in time.

Zincate galvanizing is the main process in many galvanizing processes at present, and the zincate galvanizing process is more sensitive to the dispersion ability of the solution. When the shape of the workpiece is complex, the electrolyte composition changes slightly, and the process When the conditions are slightly deviated, the dispersion ability of the electrolyte will be affected, which often affects the application and promotion of the process, and this phenomenon in the zincate zinc plating process is closer to some plating types. Therefore, it can be used as a reference for other plating species with similar quality problems, so everyone pays more attention to this process.

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