Paint is an ancient name; paint, which is a modern civilization, contains more technological ingredients and is widely used in modern technology and industry. However, there are some customary names for the paint, such as latex paint, primer, topcoat, etc. In general, a coating is a material that can be applied to the surface of an object to be coated and that forms a continuous film that is firmly attached. It can be inorganic, such as electroplated copper, electroplated nickel, electrogalvanized, and the like. It can also be organic, such as most organic polymer materials, organic polymer materials constitute a major part of today's coatings market.
The main reasons for the blistering of paint coatings are:
1. Foaming due to swelling of the film due to swelling.
That is, the high-polymer coating used for anti-corrosion, long-term exposure to aqueous parallel electrolytes usually absorbs 0.1%-3% (by weight of coating) of water. In the case of water immersion or condensation and high humidity, the coating film will cause swelling and increase the volume. If this expansion occurs in a localized range, if the stress generated when the water is swollen is greater than the adhesion, it will foam. In time, this absorbed water does not really swell the coating, but also accumulates at some internal interfaces, causing foaming.
2, due to gas inclusions or gas cattle into the bubble
During the formation of the coating film or during the cathodic protection, bubbles are generated due to the presence of volatile components in the paint film or the formation of volatile substances. This ingredient may be air bubbles incorporated during the preparation of the paint or during the application, or it may be some solvent inclusions or volatile condensate products brought into phase separation. These bubbles do not necessarily limit the world of the cup. On the surface, the old one should be seen in the entire Xu layer, and the well is easy to share with the internal reasons. The bubble may also be coated with the gas surface of the remaining surface 41. The afternoon is generated. Hydrogen, if the painted steel plate is immersed in an acidic medium towel, hydrogen ions will pass through the pore defect to generate hydrogen gas at the cathode.
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