Corrosion Specifics at the Metal-Polymer Interface

A convenient model for studying crevice corrosion specifics at the metal-plastic interface turned out to be the polymer coating on a metal substrate system. 

To investigate the coating adhesion stability one can use a method during which the coating delamination rate is recorded around a handmade point defect (puncture) reaching the substrate [19]. 

Kinetics of electrochemical processes in the electrode-coating-electrolyte systems has been examined by the potentiostatic method within the 4V exponentiation range. The samples were polarized in a three-electrode electrochemical cell installed with a thermostat to maintain a constant temperature regime. The working electrode was a sample in the form of a metal (or graphite) plate with a one-sided coating. 

Moreover, corrosion processes may run on metals covered with varnish -and paint materials in an atmosphere and lead to the formation of numerous tortuous filiform areas of damage. This type of failure, called filiform corrosion, is a specific form of crevice corrosion. The filiform type of corrosion does not, as a rule, lead to metal failure but only impairs its appearance. Filiform 

To combat the crevice corrosion one should seal gaps and clearances by metal materials not provoking corrosion of the basic material and apply electrochemical protection and corrosion inhibitors [13,20]. 

---