Corrosion of titanium nitride deposits on AISI 630 stainless steel used in radioactive water with and without chloride at pH 11

Bellanger, Gilbert; Rameau, J.J.

doi:10.1016/0013-4686(94)00326-v

Cited by 27 publications

(5 citation statements)

References 14 publications

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“…The technique relies on detecting extremely small potential variations which exist over the surface of active materials in an electrolyte. The SRET technique has been to investigate weld metal corrosion, 20 pit initiation, 21 and localized corrosion of stainless steels [22][23][24] and galvanized steels. 25 Several variants of the SRET techniques now exist.…”

Section: Sret Backgroundmentioning

confidence: 99%

A Mechanistic Investigation of Polyaniline Corrosion Protection Using the Scanning Reference Electrode Technique

Kinlen

Menon

Ding

1999

J. Electrochem. Soc.

276

155

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Growing environmental concerns regarding the use of heavy metals in coating formulations have lead to a new coating strategy employing inherently conducting polymers (ICPs), such as polyaniline (PANI), as a key component. The principal potential advantage offered by the ICP coating technology is toleration of pinholes and minor scratches. This paper describes the application of the scanning reference electrode technique (SRET) to the study of PANI coatings on carbon steel. SRET results demonstrate that conductive PANI "passivates" pinhole defects in coatings on carbon steel. In addition, it is shown that phosphonic acid salts of PANI are more effective for corrosion protection than sulfonic acid salts. A model is proposed which entails passivation of the metal surface through anodization of the metal by PANI and formation of an insoluble iron-dopant salt at the metal surface.

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Section: Sret Backgroundmentioning

confidence: 99%

A Mechanistic Investigation of Polyaniline Corrosion Protection Using the Scanning Reference Electrode Technique

Kinlen

Menon

Ding

1999

J. Electrochem. Soc.

276

155

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“…to study weld-metal corrosion, 28 localized corrosion of stainless steels, 29,30 carbon steel, 14 and galvanized steels, 18,31 as well as pit initialization. 32 Its principle attractive feature is that it can map out regions of localized corrosion while the sample is still immersed within the test solution.…”

Section: Scanning Reference Electrode Technique-sret Has Been Usedmentioning

confidence: 99%

Investigations of the Mechanism of Corrosion Inhibition by Polyaniline. Polyaniline-Coated Stainless Steel in Sulfuric Acid Solution

Gašparac

Martin

2001

J. Electrochem. Soc.

114

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The objective of this work was to elucidate the mechanism by which polyaniline ͑PANI͒ films passivate stainless steel surfaces in highly corrosive H 2 SO 4 solution. A variety of experimental methods, including measurements of the open-circuit potential, Auger depth profiling, and the scanning reference electrode technique ͑SRET͒, was used. These studies have shown that passivation is achieved because the oxidized and protically doped emeraldine-salt form of PANI holds the potential of the underlying stainless steel electrode in the passive region. Because of this electrostatic mechanism of corrosion inhibition, the entire stainless steel surface does not have to be coated with PANI in order to achieve passivation. Auger depth profiling experiments show that, in analogy to the case of a bare stainless steel surface whose potential is potentiostatically maintained in the passive region, the stainless steel surface beneath the PANI film is enriched in Cr after exposure to the H 2 SO 4 solution. Finally, SRET was used to explore passivation of the stainless steel in regions exposed to solution by pinholes intentionally cut through the PANI film. SRET shows that the PANI film surrounding the pinhole can heal the stainless steel in the pinhole region.Polyaniline ͑PANI͒ is one of the most intensively investigated of the electronically conductive polymers. 1-7 In 1985, DeBerry found that PANI films electrodeposited on stainless steel passivated the surface to corrosion in sulfuric acid solution. 8 Since then there have been numerous studies of the corrosion inhibition properties of PANI 9-14 and other electronically conductive polymers. 15 Nevertheless, there is no universally agreed upon mechanism by which these polymers provide anticorrosion properties. We have investigated corrosion inhibition by chemically synthesized PANI films coated onto stainless steel surfaces in aqueous sulfuric acid solution. The emeraldine-base form of the polymer was coated onto the electrode surface; however, exposure to the H 2 SO 4 solution converted this to the protically doped emeraldine salt form.A variety of experimental methods, including measurements of the open-circuit potential ͑OCP͒ Auger depth profiling, and the scanning reference electrode technique ͑SRET͒, was used to explore the mechanism by which the PANI film passivates the underlying stainless steel surface. These studies have shown that passivation is achieved because the PANI film holds the potential of the underlying stainless steel electrode in the passive region. The Auger results lend especially strong support to this conclusion. In analogy to the case of a bare stainless steel surface whose potential is potentiostatically maintained in the passive region, the stainless steel surface beneath the PANI film is enriched in Cr after exposure to the H 2 SO 4 solution. Because the PANI film passivates the electrode by simply holding the potential in the passive region, the entire stainless steel surface does not have to be coated with PANI in order to achieve passivation;...

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“…The equivalent circuit in Figure 6 also could be used for the analysis of this impedance spectrum. However, the element C coat described instead the electrochemical characteristics of the oxide layer on the surface of the metallic material (Bellanger and Rameau, 1995).…”

Section: Discussionmentioning

confidence: 99%

Corrosion properties of plasma electrolytic coated samples

Taheri

Mahmood

Dehghanian

et al. 2007

Anti-Corrosion Methods and Materials

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Purpose -Plasma electrolytic saturation (PES) treatments were applied on the surface of AISI H13 steel and corrosion resistance of the treated samples was investigated using electrochemical test methods. The aim was to obtain optimal corrosion resistance of the differently treated samples. Design/methodology/approach -Nitrocarburized and boride layers were produced on AISI H13 steel by the means of the PES technique. Different experimental parameters during each treatment provided different microstructural and electrochemical properties. The techniques used in the present investigation included X-ray diffraction, SEM, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). Findings -The plasma electrolytic nitrocarburising coating was characterized by lower integrity than a PEB coating. All PES coated steels had a noble electrochemical behavior compared to the untreated steel. Different nano-structures and morphologies obtained by different experimental parameters produced different electrochemical behaviors. Practical implications -The results obtained in this research into PES techniques can be used wherever good corrosion resistance with the highest efficiency is required. Originality/value -The speed of treatment by plasma electrolytic saturation techniques makes this method very suitable for industrial production of components.

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Corrosion of titanium nitride deposits on AISI 630 stainless steel used in radioactive water with and without chloride at pH 11

Cited by 27 publications

References 14 publications

A Mechanistic Investigation of Polyaniline Corrosion Protection Using the Scanning Reference Electrode Technique

A Mechanistic Investigation of Polyaniline Corrosion Protection Using the Scanning Reference Electrode Technique

Investigations of the Mechanism of Corrosion Inhibition by Polyaniline. Polyaniline-Coated Stainless Steel in Sulfuric Acid Solution

Corrosion properties of plasma electrolytic coated samples

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