Surface Pretreatment of Parts Designed for Adhesive Bonding.

The strength of a bond effected with adhesives depends to a particular extent on the treatment given beforehand to the surfaces to be joined. Apart from the various means of degreasing, there are mechanical and chemical methods for an erosion of the surfaces. The latter, commonly known as picking or etching, must be engineered to suit the material of the surfaces to be bonded. A number of baths are available for this purpose. Details are given on the surface pretreatment of aluminum and alloys, magnesium alloys, copper and alloys, brass, cast iron, and steel.