Plastic mold plating is usually carried out by multilay […]
Plastic mold plating is usually carried out by multilayer plating. If the operation is not strict, poor adhesion may occur, such as blistering and peeling of the coating. The reason is not only the following three main types of influence.
(1) Influence of electroplating process: improper combination of electroplating layer, large temperature difference, and stress of nickel layer will affect the bonding force.
(2) Effect of activation: The combined factors are usually easily overlooked. If the active layer is sufficiently bonded to the rough surface of the substrate, the electroless plating reaction occurs uniformly, and the bonding force is strong. On the contrary, if the catalytic center is small, the distribution of the activator is uneven, and there is an unreduced activator, it can certainly affect the bonding force, and sometimes a good coating will not be formed even after the deposition is completed.
(3) The effect of chemical roughening: the most direct influencing factor of the bonding strength of the plastic mold plating layer is the roughening effect of the product. The lack of roughening, the bonding strength is definitely not good, and the roughening is excessive. The resultant force will also be bad, so it is very important to properly roughen. According to experience, the surface is sufficiently hydrophilic and will lose its gloss after roughening, but it is not suitable for roughening. After electroless plating, the coating is not very bright, but it is not rough or dull. The above are three reasons for "bad adhesion of plastic coatings."