Influencing Factors of Barrel Plating Process

There are many factors that affect the quality of barrel plating, including equipment and operating process conditions, as well as the influence of the plating solution itself.

Influence of speed

The rotational speed of barrel plating affects the range and dispersion ability of the thickness change of the coating. When the number of barrel plating revolutions is too low, the thickness of the coating will change greatly, and the dispersion ability will not be good. With the increase of the speed, the thickness difference will decrease, and the dispersion ability will increase. When the speed is further increased, the thickness of the coating will decrease. Both the change difference and the dispersion ability have deteriorated again. Therefore, an appropriate barrel plating speed can only be obtained through actual trials.

As the speed increases, the thickness of the coating will decrease after a certain speed reaches the highest value, and finally stabilize, and the dispersion ability is the same, but after the highest value, it drops sharply. Because at high speeds, the flipping of the parts in the barrel is reduced due to inertia. Decreased dispersion ability. In addition, the value of each point of the thickness curve is the average value of the sampling, and the upper and lower ends of the vertical line are the variation range of the coating thickness at this point (both the maximum and minimum).

The influence of barrel hole diameter

The barrel plating of the barrel plating machine should be filled with densely packed holes. These holes not only facilitate the flow of the plating solution, but also ensure the passage of current. It can be intuitively estimated that a large aperture is conducive to the passage of current. The size of the aperture and the thickness of the coating show a more complicated relationship.

The general trend is that as the aperture increases, the thickness of the coating increases. In the end, the total amount of coating metal still increased linearly, but the local thickness of the coating decreased due to the increase in dispersion ability. When the brightener is added to the plating solution, the thickness of the plating layer increases with the increase of the hole diameter, but the dispersion ability decreases with the increase of the hole diameter. At the same time, the thickness difference of the plating layer increases when the aperture is small.

Influence of bath composition

Different electroplating solutions have an important influence on the thickness and dispersion ability of the barrel plating layer. Therefore, choosing the appropriate barrel plating formula is a very important point in the barrel plating process. Different electroplating solutions have important effects on the thickness and dispersion ability of the barrel plating layer. The test piece for barrel plating test is a box-shaped angular piece with an opening on one side. After barrel plating of this type of test piece and placed in the test barrel plating tank, the 6 different parts on the test piece are Metallographic method for thickness measurement.

Influence of product shape in barrel plating

Like rack plating, the shape of the speed-plated parts has a great influence on the electroplating effect, but the shape of the plated parts has a greater influence on the barrel plating. First of all, there are some shapes that cannot be barrel-plated at all, such as sheet products and fine needle products. Secondly, when some shapes are not suitable for barrel plating, it is necessary to extend the plating time or mix easy-to-plated products and difficult-to-plated products for plating. This can increase the pass rate of hard-to-plated parts.

The influence of current intensity

When the load of the drum is constant, with the increase of the current, the variation of the thickness of the coating increases, and the uniformity of the coating decreases. This tendency increases when there are additives in the plating solution.