Definition - What does Crazing mean?
Crazing refers to a network of visual cracks on a metal coated surface. It occurs due to tension stresses in some glassy thermoplastic polymers.
Corrosionpedia explains Crazing
Crazing is propagated in metal surface regions of high tension. This leads to the formation of microvoids and small cracks. If an applied tensile stress is sufficient, these cracks elongate and break, causing the microvoids to grow and expand. The phenomenon of crazing has no influence on corrosion resistance.
Industrially, crazing is considered a glaze defect due to the vessel being significantly weaker than an uncrazed metal of the same application. In polymers, a craze is different from a crack because it cannot be felt on the surface and it does not affect the structural integrity of a material - allowing it to still successfully support a load.
Crazing forms at significantly stressed regions associated with scratches and molecular inhomogeneities.