-The surface has been cleaned of all kinds of oil, rust and dirt.
Thanks to the surface treatment, the necessary conditions for a good adhesion of the paint are provided.
– As a result of scratches and distortions that may occur on the painted parts for various reasons, the corrosion that starts from this weak spot and can continue under the paint will be greatly slowed down.
– The salt test values expected from the painted parts will be max.
3. Why Should Degreasing Be Applied?
The degreasing process is the first and most important stage of the surface treatment process. There are mineral oils used to interrupt the reaction with the air on the metal. The duty of these oils is to cut the contact with the oxygen in the air and prevent the metal from rusting. The same oils make phosphating and chromating impossible. Therefore, the material should be made free from oil, dirt and rust.
The degreasing process can be applied as wiping, dipping and spraying at a temperature of 50-90 ºC in 5-10 minutes. The materials to be used can be alkaline, acidic or neutral. The system to be applied varies according to the conditions of the metal and the business.
Temperature, time, concentration and system are the parameters to be considered in the degreasing process. Since temperature affects the cleaning quality logarithmically, it is the most important parameter together with the concentration. If the temperature or concentration is low, it can be compensated by extending the processing time. The hardness of the water also negatively affects the degreasing process. In general, soft waters should be preferred. The life of the bath is directly proportional to the amount of oil and pollution. The more oily parts enter, the shorter the bath life will be. It is not economical to add after adding half of the amount of bathroom establishment, and it is more meaningful to pour and re-install.
It is easiest to understand whether oil remains on a piece in the rinsing bath. If water remains on the rinsed part, we can say that the oil has not been removed.
