Inhibition of AZ31 Mg alloy corrosion by anionic surfactants

Frignani, A.; Grassi, V.; Zanotto, Federica; Zucchi, F.

doi:10.1016/j.corsci.2012.05.012

Cited by 81 publications

(38 citation statements)

References 34 publications

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“…One of the best anionic corrosion inhibitors investigated for the protection of Mg alloy AZ31 in 0.1 M NaCl and 0.05 M Na 2 SO 4 solutions was the sodium salt of a sarcosine derivative, NLS [22]. Its protective effect was attributed to the rapid adsorption on the alloy surface, which limited the cathodic reaction, followed by a precipitation stage with Mg 2+ that made the inhibiting layer thicker and less defective, so, in time, the anodic oxidation was almost blocked in a wide potential range.…”

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confidence: 99%

“…An important step in this research was made by using the well-known linear free-energy relationship (LFER) principle [13] to describe and predict the efficiency of corrosion inhibitors not only in the dissolution and passivation of metals or alloys, but also in the prevention of its local depassivation [1,14,15]. Over the past decade, the high passivating ability of various carboxylates and amino acids was proved not only for iron or low carbon steels [10,[16][17][18][19][20][21][22] but also for nonferrous metals [23][24][25][26][27][28][29].…”

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confidence: 99%

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Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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This article provides an overview of works (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) devoted to the passivation of various metals and the influence of organic carboxylic acids and their salts thereon. The results of corrosion and electrochemical studies, as well studies on the composition and structural features of surface layers on the metals being protected by a variety of physicochemical methods are considered. Protection of metals by organic corrosion inhibitors (CIs) is based mostly on the adsorption of these compounds on a metal surface and subsequent formation of protective layers that minimizes access of corrosive ions to that surface. Adsorption can occur via electrostatic interaction of the CI with the metal substrate (physisorption), or it can involve charge sharing between the surface and CI (chemisorption), or combination of both interaction types can take place. Passivation of metals remains a central problem to be solved by the corrosion science. In the development of nanoindustry methods focused on creating ultrathin layers on metals capable of preventing the corrosion of the metals, an important role is played by surface passivation using CIs. Corrosion inhibitors can form passivating (often polymolecular) layers on metals but with thickness d < 10 nm, making them invisible to an unaided eye and keeping intact the decorative properties of a coated article's surface. This passivation can be done using volatile CIs from the vapor phase or nonvolatile CIs from aqueous solutions. Since metal passivation using conventional corrosion inhibitors of oxidizing type (e.g., nitrites, chromates) is seriously limited in practice due to environmental considerations, requirements for inhibiting formulations keep changing over time.The use of corrosion inhibitors in passivation has played a major role not only in the application of oxidants (chromates, nitrites, etc.) but also in adsorptive, often "oxideless" passivation that we discovered as early as in the mid-1970s [1]. As for corrosion inhibitors

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confidence: 99%

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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“…Various classes of chemical compounds are known as corrosion inhibitors for magnesium and light alloys: carboxylic acid salts [1][2][3], sulfonates, 8-hydroxyquinoline [2,4], azoles [5,6], cerium compounds [7,8], Schiff bases [9], and polyamino acids [10]. The compounds capable of forming insoluble complexes or salts with magnesium cations are of particular interest.…”

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confidence: 99%

Corrosion inhibition of Elektron WE43 magnesium alloy in NaCl solution

2018

Int. J. Corros. Scale Inhib.

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Magnesium alloys have a wide range of applications but suffer low corrosion resistance. One of the most accessible ways to protect metals from corrosion, which can also be combined with other methods, is the use of corrosion inhibitors. The effect of 1,2,3benzotriazole, 5-chloro-1,2,3-benzotriazole and sodium dioctyl phosphate on the corrosion of Elektron WE43 magnesium alloy in 0.05 M NaCl solution was studied using polarization and EIS measurements. Azoles do not exhibit the inhibitive action towards the WE43 alloy, but they slightly reduce the barrier effect of the film of corrosion products. Sodium dioctyl phosphate (DOP) is an effective inhibitor due to its anionic nature. It mainly inhibits the anodic dissolution of the alloy and has a slight effect on the cathodic process. DOP enhances the protective effect in time due to improvement of protective films. An increase in DOP concentration depresses the anodic dissolution of the alloy as well as the local depassivation, which is characterized by a displacement of the pitting potential in the positive direction. Scanning vibrating electrode technique (SVET) measurements confirmed the effectiveness of DOP as a corrosion inhibitor for Electron WE43 alloy.

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“…Unfortunately, their poor corrosion properties hinder their widespread use in many applications 1–3. There are a number of technologies including electrochemical plating, conversion coatings, anodizing, hydride coatings, organic coatings, and vapor‐phase processes available which have been used to enhance their corrosion resistance 4–22, but the vapor‐phase processes cost more and cover rather smaller areas than anodization and conversion coating treatment, which limits their applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy

Liu

Zhang

Shao

et al. 2011

Materials & Corrosion

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AZ91D magnesium alloy was treated by the alternating voltage (AV) treatment technique. The optimal AV‐treatment parameters of the alloy were determined by orthogonal experiments. Polarization curve, electrochemical impedance spectroscopy (EIS), and scanning electrochemical microscopy (SECM) were used to understand the effect of AV‐treatment on the corrosion resistance of the alloy. AFM, contact angle, and XPS were employed to investigate further the influence of AV‐treatment on the properties of the surface film formed on the alloy after AV‐treatment. The results showed that a uniform and stable film was formed and the corrosion resistance of AZ91D magnesium alloy was significantly improved after AV‐treatment. This was caused by the noticeable change of the chemical structure and semi‐conducting properties of the surface film after AV‐treatment.

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Inhibition of AZ31 Mg alloy corrosion by anionic surfactants

Cited by 81 publications

References 34 publications

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Corrosion inhibition of Elektron WE43 magnesium alloy in NaCl solution

Effect of alternating voltage treatment on corrosion resistance of AZ91D magnesium alloy

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