Application of Inhibited Films in Sealing Systems

Inhibited polymer and combined film materials display corrosion-inhibiting properties together with good barrier and strength characteristics that can be efficiently employed in sealing systems as well. 

An important field of application of inhibited polymer films is insulation of anticorrosion coatings applied on metal structures by either hot or cold methods. In the latter case inhibited film materials with an adhesive layer are used, into which the contact Cl is commonly impregnated [58,166]. 

A modification of the laminated anticorrosion film coat used on trunk Pipelines is shown in Fig. 2.58 [4,165]. The film consists of two barrier PE-based layers, 1 and 2. The first of these has strip substrates 1 bonded by glue 4 to a cellular layer 3 containing a mixture of heat-resistant mineral oil and Cl (sodium benzoate) 5. The second layer 2 is a separating layer and is weakly adhered to layer 3. Prior to application of the coating, layer 2 is removed and the film material is pasted over the metal pipeline, with inhibited layer 3 facing the surface being protected. Laminated materials of this t q)e are usually based on very strong cross-linked or oriented films to make the insulation more reliable and reduce its penetrability to ambient matter [4]. 

Insulation coats based on inhibited films with an adhesive layer will be discussed in more detail further in Sect. 3.5.3. 

Inhibited films are also employed in shell-type seals. A shell seal means a thin-walled lining that separates the sealed medium from the ambient space hollow seals of contact gaskets also belong to this category [167]. 

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