A new corrosion inhibitor for zinc chamber treatment

A set of physicochemical (ellipsometry, wetting angle measurement), electrochemical (electrochemical impedance spectroscopy, electrochemical polarization measurements) and corrosion methods (recurrent moisture condensation conditions, salt fog) was used to study the properties of adsorption films formed on copper by the chamber method from benzotriazole (BTA), 1,2,4-1H-triazole (TZ), tolyltriazole (TTA), 5-chloro-1,2,3-benzotriazole (Cl-BTA), 3amino-1H-1,2,4-triazole and 4-amino-1H-1,2,4-triazole vapors at 100°C. It was shown that upon one-hour treatment of copper with vapors of these compounds, nanosized hydrophobic adsorption films were formed on it, which hindered the thermal oxide growth but stabilized the passive state of the metal and improved its corrosion resistance. Of various triazole derivatives studied as chamber corrosion inhibitors, BTA and its derivatives can be distinguished. After one-hour chamber treatment of copper, the protective after-effect of their adsorption films grows symbatically with the saturated vapor pressure at the CT temperature, i.e., in the series BTA > TTA > Cl-BTA. This may indicate that at 100°C, there is not enough time for the formation of equilibrium adsorption films on the metal. There are reasons to believe that upon prolonged copper treatment with vapors of substituted benzotriazoles (24 hours or more), equilibrium adsorption films of inhibitors are formed thereon. In this case, the character of the effect of the properties of chamber inhibitors on their protective after-effect changes. Under these conditions, the best metal protection is provided by Cl-BTA, i.e., the least volatile and most hydrophobic of the substituted benzotriazoles studied.

Section: Introductionmentioning

confidence: 99%

Triazole derivatives as chamber inhibitors of copper corrosion

2018

“…For this purpose, metal samples were suspended above a CI to be tested (ODA, BTA or their mixture) in glass cells, which were sealed and placed in a thermostat with a given temperature. After the exposure (usually 0.5-1.0 h), samples of copper, steel [54,55] and zinc [56,57] were removed and tested for the PAE by electrochemical, accelerated and environmental corrosion methods. Important advantages of the chamber vapor-phase protection of metals are that the requirements for permeability of barrier packaging are mitigated and the range of non-toxic and available reagents for vapor-phase protection of metals is expanded.…”

Section: Vapor Phase Corrosion Inhibitionmentioning

confidence: 99%

“…Important advantages of the chamber vapor-phase protection of metals are that the requirements for permeability of barrier packaging are mitigated and the range of non-toxic and available reagents for vapor-phase protection of metals is expanded. With this in mind, a new CI, IFKhAN-121, was developed at the Frumkin Institute of Physical Chemistry and Electrochemistry, RAS and the peculiarities of chamber zinc passivation by the СI were studied [56]. At present, chamber treatment of zinc with IFKhAN-121 demonstrates the best results as shown in Figure 6.…”

Section: Vapor Phase Corrosion Inhibitionmentioning

confidence: 99%

Progress in the inhibition of metal corrosion and the prospects of its use in the oil and gas industry

Kuznetsov¹,

Чиркунов²,

Семилетов³

2019

A brief review of the main scientific areas of research and development of efficient corrosion inhibitors of metals (CIs) and their application methods is given. Temporary protection against atmospheric corrosion of steel pipes and equipment for storage (at least one year) or during transportation is often achieved by passivation using aqueous solutions of non-toxic CIs. They efficiently protect not only steel, but also copper or aluminum alloys; therefore, they successfully replace environmentally hazardous passivating solutions, not only nitrite but also chromate ones. Such solutions are often based on salts of higher carboxylic acids, for example, oleic acid or oleoylsarcosine. Temporary protection includes the use of vapor phase CIs, which, in addition to traditional volatile CIs, include the recently proposed so-called chamber CIs. A relatively new and rapidly developing method of temporary protection of metals is the superhydrophobization of their surface, which provides water contact angles θ above 150°. CIs are used in solutions of strong acids that are injected into the reservoir to increase oil production and in H 2 S-containing media in the fight against corrosion and hydrogenation. Examples of CI applications in paint systems, and more precisely in the primer layer, where they are introduced being immobilized in micro or macro containers to prevent the adverse effect of a CI on the coating while maintaining a high efficiency of metal corrosion protection, are considered. To prevent the destruction of high-pressure gas pipelines, it is important to slow down not only steel corrosion, but also its stress corrosion cracking (SCC). The properties of CIs that are necessary for their use in polymer coatings to reduce the accident incidence rate due to SCC on gas pipelines are discussed.

“…Development of the chamber treatment method was intensely performed for the past three years, and CINs suitable for the protection of monometallic products made of steel, copper, aluminum alloys, magnesium and zinc [4][5][6][7] have already been found. However, versatile CINs capable of simultaneously protecting several metals and alloys are not yet available.…”

Section: Introductionmentioning

confidence: 99%

IFKhAN-140, a chamber corrosion inhibitor for brass

2020

A combination of accelerated electrochemical (potentiodynamic and impedance) and corrosion methods (performed under intense condensation of moisture and neutral salt fog), as well as outdoor tests were used to study the protective aftereffect of adsorption films formed on brass on exposure to a mixture of octadecylamine and benzotriazole (IFKhAN-140) at 100 and 120℃. It was shown that the components of IFKhAN-140 synergistically enhance the protective aftereffect of the adsorption layers. The protective aftereffect of the adsorbed inhibitor films is most pronounced at a chamber treatment temperature of 120℃, although at 100℃ the corrosion inhibition factors are also high. The protective properties of the inhibitor at the chamber treatment temperatures studied increase symbiotically with the treatment duration. However, chamber treatment for more than one hour leads to undesirable metal tarnishing. Using the ellipsometry method, it was found that the thickness of the surface films on brass that provides a significant increase in its corrosion resistance does not exceed 20 nm. The high protective properties of IFKhAN-140 toward steel, copper and brass at once allow it to be regarded as a formulation suitable for the protection of polymetallic products.