Effect of pitting radius and pitting depth on texture state of surface

Effect of pitting radius and pitting depth on texture state of surface

The smaller the pitting radius and the larger the pitting amount, the more uniform and delicate the texture effect will be.The larger the pitting depth, the larger the texture roughness Ra.For different texture requirements, the depth of pitting and pitting radius have different requirements.Such as laser printer/copier/fax machine toner, aluminum alloy tube surface rough processing, requires a dense and thin surface texture effect, but also requires a large roughness, that is, a large R: value.This kind of texture effect needs the aluminum alloy surface pitting radius is small and the pitting depth is large, can achieve this special requirement.From the perspective of pitting formation, the smaller pitting radius is, the more likely pitting is to be passivated and "die". In order to have a large pitting depth, a larger pitting radius is required. However, for texture effect of special functional use, the coarse grain means the loss of product function.In this case, the etching solution needs to be prepared, and the acidity and halogen ions need to be selected and matched.Choosing a combination of low acidity and low C1 1 formula can easily meet this functional requirement, and it is also important to choose the right aluminum alloy material.For some decorative aluminum alloy workpiece with low roughness requirements, this scheme can also be used.

For other textures with larger roughness and coarser grain size, larger pitting radius and smaller pitting depth are required.The small pitting depth is mainly to ensure the reduction of the etching amount of the aluminum alloy and to prevent the size of the workpiece from changing too much due to corrosion.Similarly, from the formation of pitting, the larger the pitting radius, the greater the pitting depth, the deeper and larger pitting effect does not produce a beautiful appearance, but gives a rough feeling.This can be achieved by increasing the concentration of acid and the combination of halogen ions.Only when the material and etching solution are properly matched, the beautiful texture effect can be obtained by brightening the surface of the aluminum alloy after etching.

As for the effect of pitting radius and pitting depth on the texture effect, both small pitting radius and deep pitting radius and large pitting radius and shallow pitting need to be matched by etching solution and aluminum alloy material.Different types of alloy materials will have different texture effects in the same etching fluid. Similarly, different etching fluid will produce different texture effects on the same type of alloy material.Therefore, in the process of texture etching, the corrosion behavior of various types of aluminum alloy should be understood and studied as much as possible, so as to allocate the required texture etching solution to meet different requirements.