Abstract
Use of corrosion inhibitors in solid form promotes the development of a new technique for internal corrosion protection of oil & gas pipelines and operations of oil wells acidification, because the controlled dissolution of the corrosion inhibitor forms a surface on metallic parts, a protective film that prevents or minimizes undesirable reactions to corrosion. In addition, this technique has important social and environmental benefits, ensures the operator has a lower risk of contamination when handling the product, changes the type of industrial packing, facilitates transportation, reduces solvent use and consequently reduces the waste that normally results from the use of inhibitors. The purpose of this article is to present a class of solid corrosion inhibitor tested in the laboratory and offer proposals for its application in industrial pipes such as gas and oil pipelines.
Highlights
The study of the modification of polymers obtained by condensation or addition is of growing interest in several industrial segments because of the function of the reactive groups present in the polymers’ structure
The modified polymers in the form of solids can be used as corrosion inhibitors, but they must possess, inter alia, the following features: anti-corrosion protection capability, proper consistency to use controlled dissolution rate and chemical compatibility with the material, corrosive medium and other additives used in petroleum industry operations
Laboratory testing with hydrochloric acid solution showed that the inhibitor constituted of poly (2-vinyl-2oxazoline) presented 87% efficiency in corrosion protection of carbon steel coupons
Summary
The study of the modification of polymers obtained by condensation or addition is of growing interest in several industrial segments because of the function of the reactive groups present in the polymers’ structure. The modified polymers in the form of solids can be used as corrosion inhibitors, but they must possess, inter alia, the following features: anti-corrosion protection capability, proper consistency to use controlled dissolution rate and chemical compatibility with the material, corrosive medium and other additives used in petroleum industry operations. The reaction mixture was distilled to eliminate excess amino-ethanol, filtered, purified and dried under vacuum [3] [4] This polymer has oxazolinic rings hanging on the main chain in place of nitrile groups and, the polymer formed will have the characteristics of a paraffin-like appearance associated with the properties of oxazoline-2-substituted. Considering the protonation in acid medium the most likely mechanism is the adsorption of the oxazolinic rings on the metallic surface which forms a protective film and reduces or prevents the cathodic reactions
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