Passivation of mild steel by sodium octylphosphonate in neutral aqueous solution

doi:10.17675/2305-6894-2017-6-3-7

Cited by 5 publications

(7 citation statements)

References 20 publications

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“…C 8 PNa has the highest inhibiting efficiency among the studied C n PNas [190]. C 8 PNa is capable of transferring steel to a passive state, but the formation of a protective film is slow.…”

Section: Phosphonic Acids and Phosphonatesmentioning

confidence: 94%

“…However, the formation of thin films by them from aqueous solutions is limited due to low solubility and formation of colloids. At the same time, the use of C n PAs with n c ≤ 12 or diphosphonic acids with good water solubility at low concentrations makes it possible to obtain their thin layers, including SAMs, even in aqueous solutions [187][188][189][190][191]. For example, it was shown [188] that propylphosphonic acid (C 3 PA), together with Zn 2+ , efficiently (Z = 90%) inhibits the dissolution of carbon steel in an aqueous solution containing 60 mg/L Cl − .…”

Section: Phosphonic Acids and Phosphonatesmentioning

confidence: 99%

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Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Kuznetsov

Redkina

2022

Coatings

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Protection of metals in neutral media with pH 5.0–9.0 (in humid atmospheres and various aqueous solutions) can be achieved by formation of thin coatings (up to several tens of nm) on their surfaces due to adsorption and more complex chemical interactions of organic corrosion inhibitors (OCIs) with the metal to be protected. The review contains three sections. The first section deals with coatings formed in aqueous solutions, while the second one, with those formed in organic and water-organic solvents. Here we consider metal protection by coatings mainly formed by the best-known classes of OCI (carboxylates, organophosphates and phosphonates) and estimation of its efficiency. The third section discusses the peculiarities of protection of metals in the vapor-gas phase, i.e., by volatile OCIs, and a relatively new type of metal protection against atmospheric corrosion by the so-called chamber inhibitors. OCIs with relatively low volatility under normal conditions can be used as chamber OCIs. To obtain a protective coating on the surfaces of metal items, they are placed in a chamber inside which an increased concentration of vapors of a chamber OCI is maintained by increasing the temperature. This review mainly focuses on the protection of iron, steels, copper and zinc.

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Section: Phosphonic Acids and Phosphonatesmentioning

confidence: 94%

Section: Phosphonic Acids and Phosphonatesmentioning

confidence: 99%

Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Kuznetsov

Redkina

2022

Coatings

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“…The specific features of the formation of SAMs in the presence of C n PAs and their passivating ability have been most studied in relation to various steels, aluminum, and titanium alloys [ 2 , 8 , 10 , 11 , 12 , 13 , 14 ]. There are much fewer studies of their corrosion inhibition of zinc or zinc coatings, and the available studies mainly concern the modification of the zinc oxide surface [ 9 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

et al. 2022

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The composition, structure, and protective and hydrophobic properties of nanoscale films formed layer-by-layer in solutions of sodium dodecylphosphonate (SDDP) and vinyltrimethoxysilane or n-octyltriethoxysilane (OTES) on the zinc surface with different morphologies were studied by SEM, XPS, water contact angle measurements, and electrochemical and corrosion tests. The protective, hydrophobic properties of phosphonate–siloxane films on zinc and their stability in a corrosive media are determined both by the initial surface morphology and composition of the surface oxide layer, and by the nature of inhibitors. It was shown that preliminary laser texturing of the zinc surface is preferable than chemical etching to enhance the anticorrosive properties of the resulting thin films. The most stable films with excellent superhydrophobic and protective properties in atmospheres of high humidity and salt spray are formed on the zinc surface with fractal morphology during layer-by-layer passivation with SDDP and OTES.

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“…Hetero atoms in organic corrosion inhibitors increase the efficiency in the order of O ˂ N ˂ S ˂ P [1][2][3][4][5][6]. The adsorption depends on the electron density of the donor atom and of the functional group, which is influenced by the charge, type of electrolyte, and the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of the nanolayer’ post-treatment on the anticorrosion activity

2018

Int. J. Corros. Scale Inhib.

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The study of self-assembled molecular layer (SAM) of undecenyl phosphonic acid amphiphilic molecule was in the focus of experiments. This molecule has a double bond at the end of the hydrophobic carbon chain, which does not allow the formation of a very compact SAM layer. The nanolayers were developed on carbon steel surface polished before layer deposition. To increase the compactness of the nanolayer, post-treatments were applied. In one case UV light, in the other case gamma-ray irradiation were used to polymerize the double bonds and form a film with net-like structure on the metal surface. The influence of the SAM layer treatments on the layer structure was followed by monitoring the change in water wettability and by atomic force microscopic (AFM) visualization of the morphological alteration. At the UV treatment the time dependence, at the irradiation the change in the dose were the altered factors. The post-treatments of the self-assembled undecenyl phosphonic acid molecular layer resulted in denser nanolayer structures and the consequence was a significantly improved anticorrosion activity. The change in the roughness parameters (maximum height of the profile, roughness average and the root means square roughness) arisen from the AFM measurements proved the influence of post treatments on the layer structure, which could be correlated with the increase in the anticorrosion ability as it is known that with increasing surface roughness the possibility of pitting corrosion increases. The increased anticorrosion activity is due to the formation of a more effective, compact barrier layer between the nanolayer-covered metal surface and the corrosive environment.

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Passivation of mild steel by sodium octylphosphonate in neutral aqueous solution

Cited by 5 publications

References 20 publications

Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology

Influence of the nanolayer’ post-treatment on the anticorrosion activity

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