What problems may result from uneven Teflon coating thickness?

Uneven Teflon coating thickness may cause the following problems:
Affecting performance consistency
Reduced corrosion resistance: The thinner coating area cannot effectively prevent the external corrosive medium from contacting the substrate, making the substrate susceptible to corrosion and shortening the service life. For example, in chemical equipment, the thickness of the Teflon coating is uneven, and the thin coating may be quickly corroded by chemicals, causing equipment leakage.
Affecting wear resistance: Uneven thickness will make the coating wear resistance inconsistent. Thin parts are easily worn, exposing the substrate, affecting the normal operation of the equipment. For example, if the thickness of the Teflon coating on the surface of mechanical parts is uneven, the thin coating area will be worn through first during frequent friction, losing its friction reduction and protective effects.
Change lubricity: Teflon coating has good lubricity, but uneven thickness will cause inconsistent surface roughness, affecting the lubrication effect. In some mechanical parts that require high-precision lubrication, this may cause unstable friction and affect the accuracy and stability of the equipment.
Causing appearance defects
Produce color differences: Different coating thicknesses will cause differences in light reflection and absorption, resulting in inconsistent coating surface color, affecting the aesthetics of the product. For example, on some kitchenware products with high appearance requirements, uneven Teflon coating thickness will cause the surface of the pot to have different shades of color.
Uneven surface: Uneven thickness will make the coating surface uneven, with convexities or depressions. This not only affects the appearance of the product, but may also make it difficult to clean during use, and it is easy to leave dirt and bacteria.
Cause safety hazards
Affect insulation performance: In electrical equipment, Teflon coating is often used as an insulating material. Uneven thickness may cause local insulation performance to decline, there is a risk of leakage, and threaten the safety of operators and the normal operation of equipment.
Cause stress concentration: Uneven coating thickness will cause different expansion or deformation degrees of different parts when heated or stressed, resulting in stress concentration. In extreme cases, it may cause the coating to crack, fall off, or even damage the substrate, causing safety accidents. For example, for pipes working in high temperature environments, uneven Teflon coating thickness may cause the coating to rupture due to thermal stress problems, causing the pipe to be corroded by high temperature media.