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Metaza Pendant Supply Diffusion Barrier Our Metaza pendants use what is called a diffusion barrier. A diffusion barrier is a thin layer (usually micrometers thick) of metal usually placed between two other metals. It is done to act as a barrier to protect either one of the metals from corrupting the other and therefore preventing corrosion and tarnishing. Adhesion of a plated metal layer to its substrate requires a physical interlocking, inter-diffusion of the deposit or a chemical bonding between plate and substrate in order to work. The role of a diffusion barrier is to prevent or to retard the inter-diffusion of the two superposed metals. Therefore, to be effective, a good diffusion barrier requires inertness with respect to adjacent materials.