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The ability of a cathodic dip coating (i.e. E-Coat) to apply to areas of the component which are difficult to access and thus protect against corrosion, is known as engulfing.


Engulfing functions as follows:

In the application process, direct current is established between the electrode and the object to be coated. Initially, the current seeks out the path of least resistance, which means the exterior surfaces are coated first as these are closest to the electrode. The coating on the exterior of the component leads to increased electrical resistance. The current consequently seeks the path with least resistance, even if it may be further from the electrode. As a result, this enables even difficult to access areas of the parts to be coated. The process is repeated continuously, until the electrical resistance is too high and the minimum current density required for coating can no longer be achieved. The end result is an even coating thickness on the component to be coated (i.e. both outside and inside) and therefore effective corrosion protection for the part


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Technical terms cannot always be avoided. As corrosion experts, we not only want to give you comprehensive advice, we are also interested in making you a corrosion expert yourself.

The variety around the topic of corrosion and corrosion protection is also in our glossary at home: explanations from A as in Adhesion to T as in Thread tolerance. Have fun clicking through!