Corrosion behavior of polypyrrole coated mild steel

Reut, Jekaterina; Öpik, Andres; Idla, K.

doi:10.1016/s0379-6779(98)01036-4

Cited by 78 publications

(26 citation statements)

References 5 publications

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“…The anodic and broad cathodic peaks are observed. Pyrrole oxidation again commences at 0.6 V. This result is generally consistent with a report by Reut et al, 35 showing the existence of anodic and cathodic peaks that they assigned to reversible formation of an electroactive PPy doped with sodium dodecylsulphate (NaDS). The pyrrole in that work, however, began to oxidize at 0.8-1.0 V in NaDS.…”

Section: Resultssupporting

confidence: 92%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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Electrically conducting polypyrrole films doped with dodecylbenzenesulphonic acid (PPy-DBSA) have been electrochemically polymerized on stainless steel. The surface and electrochemical properties of the films were investigated by a combination of cyclic voltammetry (CV), scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS). The CV results showed an irreversible reaction of electropolymerization. All PPy-DBSA films had a nodular or cauliflower-like surface morphology. The grain size was dependent on the growth current density and the growth time. The ratio of incorporated DBSA anions to pyrrole repeat units in the films was ∼1 : 2. The doping level, calculated from the positive charge accumulated in the polymer chain (at.% ratio .N + + N 2+ //N total /, varied as a function of the growth current density and the growth time. The maximum doping level occurred at a growth current density of 0.5 mA cm −2 , consistent with an oxidation peak of the pyrrole monomer observed by CV. The interfacial layer between the polymer and substrate was also studied. A sulphur-rich layer was observed, indicating the presence of a thin layer of DBSA at the interface. In addition, iron was detected on the metal side of the film as a result of its dissolution from the stainless-steel electrode during the electropolymerization process. These results have implications for the use of polypyrrole films as environmentally friendly corrosion mitigants.

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Section: Resultssupporting

confidence: 92%

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Prissanaroon

Brack

Pigram

et al. 2002

Surface & Interface Analysis

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“…44,45 During immersion in a corrosive environment, reduction of the oxidized PPy, which is electrically conductive, proceeds, along with oxidation of the substrate. The reduction of PPy releases dopant anions to maintain the charge balance in the conducting polymer.…”

Section: Resultsmentioning

confidence: 99%

Formation of Porous Anodic Films on Carbon Steels and Their Application to Corrosion Protection Composite Coatings Formed with Polypyrrole

Konno

Farag

Tsuji

et al. 2016

J. Electrochem. Soc.

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The growth behavior of nanoporous anodic films on carbon steel containing 0.213 mass% carbon has been examined. The films were grown by anodizing in an ethylene glycol (EG) electrolyte containing 0.1 mol dm −3 NH 4 F and 0.5 mol dm −3 H 2 O. The steel contains carbide precipitates with sizes in the range 50-800 nm. The anodic film formed on the carbide phase grew more slowly and was more chemically soluble during anodizing, resulting in submicrometer pits on the anodic film. The nanoporous morphology of the anodic films formed on an α-Fe matrix resembled those formed on iron. Heat treatment of the anodized specimens caused transformation of the chemically soluble fluoride-containing amorphous or poorly crystalline anodic films to crystalline oxide films containing α-Fe 2 O 3 and Fe 3 O 4 . Polypyrrole (PPy) was electropolymerized on the transformed surfaces to form a corrosion-protective composite coating. The resultant specimens coated with the composite coating showed improved durability compared to passivated steel with a PPy coating. Porous oxide films formed on aluminum and magnesium alloys by anodizing have been extensively studied for their ability to protect alloys from corrosion and wear; in addition, an anodizing process is of fundamental interest for the growth of self-ordered porous films. 1-3Recently, attention has been drawn to the formation of highly ordered nanoporous structures on aluminum, which are formed by the anodizing process, and their use in nanoscience and nanotechnology. 4 Furthermore, the formation of self-ordered nanoporous oxide films on a range of metals, including titanium, 5 zirconium, 6-8 niobium, 9 tantalum, 10 tungsten is also of interest. 11,12Iron is the most widely used metal. Recently, self-ordered nanostructured oxide films have been developed on iron using organic electrolytes containing fluoride and trace amounts of water. [13][14][15][16][17][18][19][20][21][22][23][24][25][26] Depending upon the anodizing conditions, either nanoporous or nanotubular anodic films are formed on iron. 14,18,24,27 The as-formed anodic films are often amorphous and contain a relatively high concentration of fluoride species; however, such films are not chemically stable. Heat treatment of the anodized iron samples causes crystallization of the amorphous anodic film, forming mainly α-Fe 2 O 3 .16,17,21 α-Fe 2 O 3 is a promising material for solar-driven water splitting due to its low bandgap, low cost, abundance, and high chemical stability; consequently, nanostructured porous α-Fe 2 O 3 films formed by anodizing and subsequent heat-treatment have recently attracted much attention. 17,18 In addition to photocatalytic applications, porous anodic films on iron can be used to protect iron and steel from corrosion. Iron and steel alloys are often coated with paints to protect them from environmental corrosion. In addition, interest in the use of conducting polymer coatings has increased because they provide anodic protection due to their oxidizing ability; in addition, they act as a physical ba...

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“…[17][18][19][20][21] There have been fewer reports of corrosion studies involving polypyrrole on active metals, the majority of these studies involving films that were electrochemically deposited onto steel. [22][23][24][25][26][27] There appears to be little or no reported work involving polypyrrole on aluminum alloys.…”

mentioning

confidence: 99%

Conducting Polymers and Corrosion III. A Scanning Vibrating Electrode Study of Poly(3-octyl pyrrole) on Steel and Aluminum

He¹,

Gelling²,

Tallman³

et al. 2000

J. Electrochem. Soc.

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Electroactive conducting polymers (ECPs) continue to be of considerable interest as components of corrosion‐resistant coating systems. ECPs, in addition to being conductive, are redox active materials, typically with potentials that are positive of iron and aluminum. Thus, as with chromate, interesting and potentially beneficial interactions of ECPs with active metal alloys such as steel and aluminum are anticipated. In this work, the scanning vibrating electrode technique (SVET), also known as the current density probe, was used to probe such interactions between a poly(3‐octyl pyrrole) coating (POP) and cold‐rolled steel and aluminum (Al 2024‐T3) substrates. The POP coatings were scribed to simulate a defect through the coating to the metal substrate surface. The SVET was used to map the current flowing in and around the defect while the sample was immersed in either 3% NaCl (steel) or in dilute Harrison solution (aluminum), an aqueous solution consisting of 0.35% false(NH4)2SO4 , 0.05% NaCl. Although there were significant differences in the behavior of the POP‐coated steel and POP‐coated aluminum substrates, both exhibited a significant delay before the onset of any observable current compared to uncoated or epoxy‐coated samples. Current density maps for the steel clearly indicate that the reduction reaction occurred on the conducting polymer surface, with oxidation confined to the defect. Current density maps for the aluminum alloy never displayed significant oxidation at the defect. Rather, reduction (after a significant delay) occurred at the defect as well as across the polymer surface, with concomitant localized undercoating oxidation of the aluminum substrate. © 2000 The Electrochemical Society. All rights reserved.

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Corrosion behavior of polypyrrole coated mild steel

Cited by 78 publications

References 5 publications

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Surface and electrochemical study of DBSA‐doped polypyrrole films grown on stainless steel

Formation of Porous Anodic Films on Carbon Steels and Their Application to Corrosion Protection Composite Coatings Formed with Polypyrrole

Conducting Polymers and Corrosion III. A Scanning Vibrating Electrode Study of Poly(3-octyl pyrrole) on Steel and Aluminum

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