Abstract：The non-stick pans have been widely used in daily cooking. The durability and safety are closely related to the human health. The use performance of non-stick pans is mainly depended on the coating quality on surface. However, the conventional test methods at present cannot analyze the composition and structure of coating, thus it is difficult to accurately evaluate the use performance. The coatings of non-stick pans from different manufacturers were analyzed by cross section metallographic examination, spectroscopy and energy spectrum composition analysis. The composition of surface coating was firstly analyzed using spectrometer, and then the structure of coating was investigated using cross section metallographic examination. The results showed that the coatings of non-stick pans from different manufacturers were all composed of external organic matter and internal inorganic substance. The external organic matter was poly tetra fluoro ethylene (PTFE) with thickness of about 14-30 μm. But the composition and thickness of internal inorganic substances were quietly different for the non-stick pans from different manufacturers. They were mixture of diamond-like carbon or nano alumina particles and silicon particles. The thickness varied from 12 μm to 100 μm. The difference of coatings directly led to different properties such as hardness and bonding strength. The experimental method could be used to analyze the structure, defect and thickness of coating, and thus to evaluate the quality of coating. This study could compensate for the shortcomings of test methods in existing standards.
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