Corrosion inhibitors for carbon steel: A review

Abstract

Corrosion inhibitors are one of the practical and cost‐effective way of preventing and inhibiting corrosion. An inhibitor's primary function includes creating a barrier by forming one or more molecular layers to protect against corrosive attacks. Organic molecules are one of the most popular, efficient, and practical corrosion inhibitors, and all studies demonstrate that organic compounds, preferentially those containing nitrogen (N), sulphur (S), and oxygen (O), have high inhibitory efficiency. Also, corrosion inhibitors include inorganic compounds. Since inorganic and organic inhibitors are both toxic and expensive; emphasis is being placed on developing green corrosion inhibitors as well as on modification of inhibitors. We are focusing on carbon steel (CS) substrate in this review as it is the first‐line material and is widely employed in various industrial applications. Whereas corrosion resistance of CSs in acidic environments is a constantly evolving topic, working on better performance of CSs as more cost‐effective alternatives to other alloys.

The Power of Lichens: New Eco‐Friendly Corrosion Inhibitors from Nature

“…This type of steel has a wide range of uses in many different sectors. [40] The three lichens studied are rich in several secondary metabolites. [18] They included the atranorin and (+)-iso-usnic acid from Parmotrema hypoleucinum as well as the methyl orsellinate from Roccella phycopsis, and parietin from Xanthoria parietina.…”

Electrochemical, Structural and Thermodynamic Investigations of Methanolic Parsley Extract as a Green Corrosion Inhibitor for C37 Steel in HCl

“…Nevertheless, the introduction of a corrosion inhibitor results in the displacement of the adsorbed water molecules. The substitution of water with inhibitor molecules results in the obstruction of active areas on the metal surface, where corrosion reactions usually take place [38].…”

Natural Sources Extract as Acidic Corrosion Inhibitors

“…Organic inhibitors have been shown to be suitable for reducing the corrosion rate in an acidic medium more effectively than inorganic inhibitors and are often mixed inhibitors that affect both anodic and cathodic types of reactions, while inorganic inhibitors are often cathodic inhibitors or anodic inhibitors [10].…”