Thiourea and N-Methylthiourea as Corrosion Inhibitors for Steel in Phosphoric Acid

The corrosion of zinc in phosphoric acid containing hexamine has been studied at different acid concentrations, inhibitor concentration and temperatures. Corrosion increases with the concentration of acid and the temperature. The inhibition efficiency (IE) of hexamine increases with the concentration of inhibitor. The IE decreases with the increase in concentration of acid. As temperature increases, percentage of inhibition decreases. The plot of log (Θ/1-Θ)versuslog C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Longmuir isotherm. Galvenostatic polarization curves show polarization of both anodes as well as cathodes.

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Corrosion inhibition of steel in phosphoric acid

Corrosion Reviews ◽

10.1515/corrrev-2017-0104 ◽

2018 ◽

Vol 36 (3) ◽

pp. 267-280 ◽

Cited By ~ 4

Author(s):

Anees A. Khadom ◽

Salah N. Farhan

Keyword(s):

Adsorption Isotherm ◽

Synergistic Effect ◽

Phosphoric Acid ◽

Corrosion Inhibitors ◽

Acid Corrosion ◽

Industrial Applications ◽

Mixed Effect ◽

Steel Alloys ◽

Organic Inhibitors ◽

Anodic Reactions

AbstractPhosphoric acid has been used in many industrial applications and can be in contact with a lot chemical and petrochemical equipment. Most of this equipment is made of steel alloys that may be damaged because of contact with acid. Corrosion inhibitors can be used for to protect steel alloys against several forms and various environments of corrosion. In this paper, the efficiency and applications of organic and inorganic inhibitors in different environments of phosphoric acid are investigated. More than 40 papers were collected and reviewed. Surveys of the stated works in phosphoric acid environments are documented. It was concluded that organic inhibitors performed as good corrosion inhibitors and are used widely. The use of inorganic inhibitors was limited. Most of studied inhibitors follow Langmuir’s adsorption isotherm, and the mechanism of the inhibition can be ascribed to the mixed effect on cathodic and anodic reactions. The synergistic effect was also addressed in the present work.

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Electrochemical and theoretical study of newly quinoline derivatives as a corrosion inhibitors adsorption onmild steel in phosphoric acid media

Inorganic Chemistry Communications ◽

10.1016/j.inoche.2020.108222 ◽

2020 ◽

Vol 121 ◽

pp. 108222

Author(s):

N. Dkhireche ◽

M. Galai ◽

M. Ouakki ◽

M. Rbaa ◽

E. Ech-chihbi ◽

...

Keyword(s):

Phosphoric Acid ◽

Corrosion Inhibitors ◽

Theoretical Study ◽

Quinoline Derivatives ◽

Acid Media

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ChemInform Abstract: ANILINES AS CORROSION INHIBITORS FOR AN ALUMINUM-COPPER ALLOY IN PHOSPHORIC ACID

Chemischer Informationsdienst ◽

10.1002/chin.197652027 ◽

1976 ◽

Vol 7 (52) ◽

pp. no-no

Author(s):

J. D. TALATI ◽

J. M. PANDYA

Keyword(s):

Phosphoric Acid ◽

Copper Alloy ◽

Corrosion Inhibitors ◽

Aluminum Copper Alloy

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Safety Assessment of Phosphoric Acid and Its Salts as Used in Cosmetics

International Journal of Toxicology ◽

10.1177/10915818211014499 ◽

2021 ◽

Vol 40 (1_suppl) ◽

pp. 34S-85S

Author(s):

Wilbur Johnson ◽

Ivan Boyer ◽

Wilma F. Bergfeld ◽

Donald V. Belsito ◽

Ronald A. Hill ◽

...

Keyword(s):

Phosphoric Acid ◽

Safety Assessment ◽

Corrosion Inhibitors ◽

Chelating Agents ◽

Expert Panel ◽

Cosmetic Products

The Expert Panel for Cosmetic Ingredient Safety (Panel) assessed the safety of Phosphoric Acid and its salts (31 ingredients), which are reported to function as buffering agents, corrosion inhibitors, chelating agents, and pH adjusters in cosmetic products. The Panel reviewed data relating to the safety of these ingredients and concluded that Phosphoric Acid and its salts are safe in the present practices of use and concentration in cosmetics when formulated to be nonirritating.

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