Specifics and Methods of Inhibiting the Underfilm Corrosion of Carbon Steel
Maxim Petrunin, Tatyana Yurasova, Alevtina Rybkina, Liudmila Maksaeva
TL;DR
This paper studies how carbon steel corrodes under damaged polymer coatings and proposes a method using organosilanes to prevent this corrosion.
Contribution
A new method using organosilane pre-treatment to inhibit underfilm corrosion of carbon steel is proposed.
Findings
Protective current decreases sharply near the edge of coating defects.
Carbon dioxide and hydrogen sulfide significantly increase corrosion rates.
Localized corrosion can lead to stress corrosion cracking in carbon steel.
Abstract
The process of metal dissolution under a delaminated insulating polymer coating (underfilm dissolution) has been studied. For this purpose, we used an experimental setup that simulates the process of corrosion of underground metal structures in the presence of through defects in the polymer coating and/or extended areas of peeling of the polymer coating from the metal (loss of adhesion)—subfilm cavities partially or completely filled with electrolyte. In particular, the distribution of the protective current under a peeled polymer coating was studied, and a sharp decrease in the value of the protective current was shown at a distance of 1–3 cm from the edge of the defect with a gap between the metal and the coating of 1–6 mm. The localized nature of metal corrosion under the exfoliated polymeric coating has been demonstrated. The ratio of the areas with accelerated corrosion to the…
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Taxonomy
TopicsCorrosion Behavior and Inhibition · Material Properties and Failure Mechanisms · Hydrogen embrittlement and corrosion behaviors in metals