SVET and SECM imaging of cathodic protection of aluminium by a Mg-rich coating

Simões, A.M.; Battocchi, Dante; Tallman, Dennis E.; Bierwagen, Gordon P.

doi:10.1016/j.corsci.2007.03.045

Cited by 120 publications

(73 citation statements)

References 24 publications

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“…All electrochemical investigations were performed using a scanning electrochemical microscope (SECM), which allows various types of corrosion processes to be investigated [34][35][36][37][38][39][40]. Pits were generated using a modified SECM setup including a 3-axis positioning system (VP-25XA, Newport) driven by a motion encoder (ESP300, Newport) allowing a spatial resolution of 100 nm in the three directions [8].…”

Section: Experimental Setup and Electrode Preparationmentioning

confidence: 99%

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

Aouina¹,

Balbaud-Célérier²,

Huet³

et al. 2013

Electrochimica Acta

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In this paper, an ion micro dispenser (IMD) was used to initiate a single pit by generating chloride anions above a 316L stainless steel electrode in either H 2 SO 4 or HClO 4 electrolyte.The current variations with respect to time provided an unambiguous characterization of the single pit evolution. Different pit shapes were observed depending on both the nature of the electrolyte and potential applied to the electrode. Substituting SO 4 2-for ClO 4 -gave smaller (in diameter) but deeper pits at the early stage of pitting. However, when using a different setup that allows the sustaining of the pit propagation with a continuous supply of Cl -, the deeper pits were observed in HClO 4 rather than H 2 SO 4 . The formation of an iron sulphate salt film at the bottom of the pit by precipitation of dissolution products in H 2 SO 4 slowed down the corrosion rate. At high potentials, the repassivation mechanism outweighed the metal dissolution in the ClO 4 -solution containing solution.

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Section: Experimental Setup and Electrode Preparationmentioning

confidence: 99%

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

Aouina¹,

Balbaud-Célérier²,

Huet³

et al. 2013

Electrochimica Acta

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“…38,39 Magnesium-rich primer (MgRP) technology provides cathodic protection to the aluminum alloy by galvanic coupling of the metallic magnesium pigment and the aluminum alloy. 40,41 While the MgRP technology shows very promising performance, the industry still needs an alternative for chromate using the traditional leaching mechanism. Hence, the search for chromate-free inhibitor technology is continuing.…”

Section: Introductionmentioning

confidence: 99%

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

et al. 2016

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Lithium salts are being investigated as leachable corrosion inhibitor and potential replacement for hexavalent chromium in organic coatings. Model coatings loaded with lithium carbonate or lithium oxalate demonstrated active corrosion inhibition and the formation of a protective layer in a damaged area during neutral salt spray exposure. The present paper provides an abridged overview of the initial studies into this novel inhibitor technology for the active corrosion protection of aluminum alloys. Coating defects were investigated by microscopic techniques before and after exposure to corrosive conditions. Scanning electron microscopy analysis of cross-sections of the coating defect area demonstrated that the protective layer comprises a typical threelayered structure, which included a dense layer near the alloy surface, a porous middle layer, and a flakeshaped out layer. Potentiodynamic polarization measurements obtained with a microcapillary cell positioned in the coating defect area and electrochemical impedance spectroscopy confirmed the corrosion protective properties of these protective layers. The longterm corrosion inhibition of the lithium-based coating technology was tested in industrial coating systems.

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“…SECM imaging experiments can be performed by either feedback or generation-collection (G-C) mode. [6] SECM has been applied successfully to a great variety of corrosion processes including the visualization of anodic and cathodic areas, [7,8] the identification of precursor sites for pitting corrosion, [9][10][11][12] the detection of metastable pit nucleation, [13] the generation of single pits on passive metals, [14][15][16][17][18] the dissolution of inclusions in alloys, [19][20][21] the water uptake and blister formation at organic-coated metals, [22][23][24] the degradation of organic coatings from metal-coating interfaces, [25][26][27][28] the permeation of hydrogen through metals, [29] and the characterization of chemical inertness of ceramic coatings on metals. [30,31] In most instances, the corrosion process is followed through the detection of the metal ion released in the aqueous phase from the corresponding corroding metal or metal alloy.…”

Section: Introductionmentioning

confidence: 99%

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

González-García

Battistel

Daniele

2011

Chemistry A European J

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This work presents a scanning electrochemical microscopy (SECM)‐based in situ corrosion probing methodology that is capable of monitoring the release of zinc species in corrosion processes. It is based on the use of Hg‐coated Pt microelectrodes as SECM tips, which offer a wider negative potential range than bare platinum or other noble‐metal tips. This allows for the reduction of zinc ions at the tip to be investigated with low interference from hydrogen evolution and oxygen reduction from aqueous solutions. The processes involved in the corrosion of zinc during its immersion in chloride‐containing solutions were successfully monitored by scanning the SECM tip, set at an adequate potential, across the sample either in one direction or in the X–Y plane parallel to its surface. In this way, it was possible to detect the anodic and cathodic sites at which the dissolution of zinc and the reduction of oxygen occurred, respectively. Additionally, cyclic voltammetry (CV) or constant potential measurements were used to monitor the release of zinc species collected at the tip during an SECM scan.

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SVET and SECM imaging of cathodic protection of aluminium by a Mg-rich coating

Cited by 120 publications

References 24 publications

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

Initiation and growth of a single pit on 316L stainless steel: Influence of SO42− and ClO4− anions

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

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