Plastic Plating-Theory of Cohesion of Electroplating Products
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There are two theories on the principle that ABS plastic can improve its adhesion with the metal matrix after being roughened. One is the chemical binding force theory, and the other is the physical (mechanical) binding force theory.
(1)The chemical binding force theory believes that there is a chemical binding force between the polar groups contained in the 8133 plastic itself or generated after chemical treatment and roughening, such as 1090, 0009, 40, etc., and the crystal of the metal coating., that is, intermolecular bonding force. This is an early theory of cohesion, but it is not well documented in practice. However, with the development of surface observation technology, surface infrared spectroscopy has now been used to detect such polar groups on plastic surfaces.
(2)The physical (mechanical) binding force theory holds that this theory is relatively common. This theory holds that after butadiene in the surface and near-surface layer of six-83 plastic is dissolved during the roughening process, a large number of micropores are formed on the surface. The random nature of the distribution of butadiene on the surface also makes the distribution of these micropores random, and the shapes are not exactly the same, but a considerable part of them are semicircular or semi-circular, especially the semi-circular pores, with a structure with small orifices and large pores. When the coating grows in these pores, it is equivalent to forming many small anchors. Thereby increasing the binding force between the coating and the substrate. This can-shaped hole can also be regarded as what is called a dovetail groove in mechanical engineering, so this binding force is also referred to as the dovetail groove effect or anchor effect.
Now a microscope is used to observe the cross-section of the coating and substrate of the 83 plastic electroplated part, and it is found that this mechanical bonding structure does exist. Moreover, it has good consistency with the state of the roughening process in production practice, which proves that the mechanical cohesion theory is valid. However, this does not exclude the theory of chemical binding force, because due to the dissolution of butadiene, the original copolymerized bonds between butadiene and human 3 components are all broken, resulting in much more polar groups and broken bond chains in the pores than on the surface., which will strengthen the binding force of the coating and plastic. Perhaps it is the joint action of the two forces, but obviously the mechanical binding force accounts for a greater proportion.
