There are many reasons for coating defects, and the same problem may be caused by different reasons. Therefore, it is unrealistic to give a complete definition of coating defects, but a comprehensive judgment definition is given, and It is effective to refine it by classification. Coating film defects refer to complex and diverse situations that do not conform to the normal state, testing and acceptance standards or agreed conditions in the process of production, storage, construction and application of the coating. The problems and phenomena are called film defects. Its characteristics are manifested in the following aspects:
(1) Coating defects will appear in every link of coating realization, including raw materials, production, storage, transportation, construction and application, etc.;
(2) The defects of the coating film are very complicated, and the appearance phenomena are various. Usually one factor may produce several ill phenomena, or one ill phenomenon is caused by several factors. Such characteristics make it difficult to analyze the ills of the coating film, and may cause confusion, and even polar opposites. bring some difficulties to solve the problem;
(3) For the so-called ills or problems, there must be a comparison of normal conditions. These references can be the default state of everyone, or they can be agreed requirements. The most standardized ones are the testing and acceptance standards of various countries or industries.
