Influence of some synthesized pyrimidine derivatives on corrosion inhibition of mild steel in hydrochloric acid medium

Gurudatt, Doddahosuru Mahadevappa; Mohana, K. N.

doi:10.5155/eurjchem.5.1.53-64.899

Cited by 7 publications

(2 citation statements)

References 35 publications

(28 reference statements)

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“…The efficiency of the CIs increases in the series: I  II  III  IV. Other conditions being equal, the inhibitive effect of such CIs is improved upon replacement of an oxygen atom with sulfur or an ethoxy group with a hydrazine residue [62]. Conversely, the efficiency of compounds with the structures…”

Section: N-containing Six-membered Heterocyclic Compoundsmentioning

confidence: 99%

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

2018

Int. J. Corros. Scale Inhib.

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The current state of studies on metal protection from corrosion in mineral acid solutions by six-membered N-containing heterocyclic compounds is reviewed. Literature data on the protection of various metals in acid solutions by these compounds are summarized. The specific features of their protective action mechanism are discussed. The feasibility of metal protection by formulations containing these compounds, even in high-temperature corrosion, is noted. N-Containing six-membered heterocyclic compounds are prone to adsorption on metal surfaces from mineral acid solutions. Based on the free adsorption energy values of these corrosion inhibitors (CIs) on metal surfaces, it can be deemed with high probability that they are mostly bound to a metal by physical forces, but upon adsorption on its surface they slow down the cathodic and anodic reactions, and eventually inhibit its corrosion. Compounds containing S atoms or bulky substituents are most interesting. These compounds are adsorbed on metals more strongly and behave as more efficient CIs. It often happens that such CIs hinder metal corrosion in HCl solutions but do it much more weakly in H 2 SO 4 , HClO 4 , and H 3 PO 4. A known method for improving the protective effect of N-containing six-membered heterocyclic CIs in these media involves combining them with anionic additives, e.g., halide or rhodanide anions. The heterocycles discussed behave as CIs in "cold" solutions but lose these properties at higher temperatures. Examples of the use of six-membered N-containing heterocycles as CIs of various steels and non-ferrous metals (Al, Cu, Sn, Zn and their alloys) are available in literature. The industrial application of individual six-membered N-containing heterocycles and their derivatives for metal protection in acid media is of little promise and is unjustified. It is more appropriate to use these compounds as components of inhibitor mixtures. Mixed CIs containing these compounds can hinder corrosion even in such corrosive media as high-temperature HCl solutions or hot H 3 PO 4 solutions. The base for creating prospective mixed corrosion inhibitors for metals in acids should be searched for among six-membered heterocyclic compounds containing two or more nitrogen atoms or compounds obtained from natural raw materials. The bibliography includes 150 references.

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Section: N-containing Six-membered Heterocyclic Compoundsmentioning

confidence: 99%

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

2018

Int. J. Corros. Scale Inhib.

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“…-methyl-4-morpholin-4-yl-2-oxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid ethyl ester, 6-methyl-4-morpholin-4-yl-2-thioxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid ethyl ester, 6-methyl-4-morpholin-4-yl-2-oxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid hydrazide, 6-methyl-4-morpholin-4-yl-2-thioxo-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid hydrazide [20] [21] in 0.1 M HCl; pyrimidine, 2-aminopyrimidine, 2-hydroxypyrimidine hydrochloride, 2-mercaptopyrimidine, 2,4-diaminopyrimidine, 2,4,6-triaminopyrimidine, 2,4-diamino-6-hydroxypyrimidine and 2,4-diamino-6-meracaptopyrimidine [7], N-(pyrimidin-2-ylcarbamothioyl)- [26], thiazolo-pyrimidine derivatives [27], aminopyrimidine derivatives [28] [39] for stainless steel 304 have been studied by using various techniques (Table 1). Studies reported that the adsorption of the pyrimidine derivative on steel surface mainly depends on its physico-chemical properties, electronic density of donor atom and possible interaction of its π-orbitals with d-orbitals of the surface atom.…”

Section: Corrosion Inhibitorsmentioning

confidence: 99%

Pyrimidine derivatives as potential corrosion inhibitors for steel in acid medium – An overview

2018

Int. J. Corros. Scale Inhib.

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Acidic environments are widely used in several industrial operations, such as oil well acidification, acid pickling, acid cleaning and acid descaling, which generally lead to serious metallic corrosion. Despite the relatively limited corrosion resistance of carbon steel, it is widely used in marine applications, chemical processing, petroleum production and refining, construction and metal-processing equipments due to its excellent mechanical properties and low cost. Out of several methods, usage of corrosion inhibitor is one of the most important techniques for controlling the corrosion. Several organic inhibitors have been tried for the corrosion inhibition of steel, out of which organic compounds with more than one heteroatom containing pi-electrons are found to exhibit high inhibiting properties by providing electrons which interact with metal surface. However, the use of several heterocyclic inhibitors has caused negative effects on the environment because of their toxicity and nonbiodegradability. In this context, pyrimidine derivatives are found to attract great interest due to their environmentally benign properties. In this article, it is aimed to review the usefulness of pyrimidine derivatives for the corrosion inhibition of steel in acid medium.

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Efficiency of a pyrimidine derivative for the corrosion inhibition of C1018 carbon steel in aqueous acidic medium: Experimental and theoretical approach

Rasheeda

Alamri

Krishnaprasad

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Influence of some synthesized pyrimidine derivatives on corrosion inhibition of mild steel in hydrochloric acid medium

Cited by 7 publications

References 35 publications

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

Nitrogen-containing six-membered heterocyclic compounds as corrosion inhibitors for metals in solutions of mineral acids – A review

Pyrimidine derivatives as potential corrosion inhibitors for steel in acid medium – An overview

Efficiency of a pyrimidine derivative for the corrosion inhibition of C1018 carbon steel in aqueous acidic medium: Experimental and theoretical approach

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