scholarly journals Corrosion protection of iron using porous anodic oxide/conducting polymer composite coatings

2015 ◽  
Vol 180 ◽  
pp. 479-493 ◽  
Author(s):  
Yoshiki Konno ◽  
Etsushi Tsuji ◽  
Yoshitaka Aoki ◽  
Toshiaki Ohtsuka ◽  
Hiroki Habazaki
Keyword(s):  
Oxide Layer ◽  
Composite Coating ◽  
Corrosion Protection ◽  
Composite Coatings ◽  
Anodic Oxide ◽  
Oxide Interface ◽  
Self Organized ◽  
Anodic Oxide Layer ◽  
Poor Adhesion ◽  
Protection Of Metals

Conducting polymers (CPs), including polypyrrole, have attracted attention for their potential in the protection of metals against corrosion; however, CP coatings have the limitation of poor adhesion to metal substrates. In this study, a composite coating, comprising a self-organized porous anodic oxide layer and a polypyrrole layer, has been developed on iron. Because of electropolymerization in the pores of the anodic oxide layer, the composite coating showed improved adhesion to the substrate along with prolonged corrosion protection in a NaCl aqueous corrosive environment. The anodic oxide layers are formed in a fluoride-containing organic electrolyte and contain a large amount of fluoride species. The removal of these fluoride species from the oxide layer and the metal/oxide interface region is crucial for improving the corrosion protection.

scholarly journals An In Situ Reflection Mode Quick Scanning EXAFS Study of Anodic Oxide Layer Formation on Silver

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-717-C2-722 ◽  
Author(s):  
D. Hecht ◽  
P. Borthen ◽  
R. Frahm ◽  
H.-H. Strehblow
Keyword(s):  
Oxide Layer ◽  
Anodic Oxide ◽  
Layer Formation ◽  
Reflection Mode ◽  
Exafs Study ◽  
Anodic Oxide Layer

The nature of the luminescence centers of the anodic oxide layer on aluminum

1971 ◽  
Vol 14 (11) ◽  
pp. 1584-1586
Author(s):  
T. Z. Tseitina ◽  
M. I. �idel'berg
Keyword(s):  
Oxide Layer ◽  
Anodic Oxide ◽  
Luminescence Centers ◽  
Anodic Oxide Layer

A review on corrosion protection with single-layer, multilayer, and composites of graphene

2018 ◽  
Vol 36 (2) ◽  
pp. 155-225 ◽  
Author(s):  
András Gergely
Keyword(s):  
Corrosion Protection ◽  
Composite Coatings ◽  
Single Layer ◽  
Comprehensive Overview ◽  
Environmental Friendliness ◽  
Thin Carbon ◽  
Graphene Derivatives ◽  
Research Findings ◽  
And Performance ◽  
Protection Of Metals

AbstractIn this review, most of the works are attempted to cover about corrosion protection of metals with molecular-tight atomic thin carbon layers of all sorts of graphene derivatives from the very beginning to the latest theoretical and experimental research findings, so as engineering achievements in the field up to date. Although high and tuneable electrical conductivity of graphene is the main feature exploited in majority of the applications such as catalysis, photocatalysis, electrocatalysis, low electrical but high chemical resistivity electrodes in batteries, and ultracapacitors, corrosion protection of metals favours the opposite – good physical separation and electrical insulation. Both of the latter ones lead to durable excellent protection, which can only be ensured by special design and implementation. Thus, the milestones of major hardships both on theoretical and practical sides are delineated similarly as utmost developments in circumventing all problems with an aim to ensure timely transfer from the research phase to successful industry utilisations. Relying on numerous works, this paper gives a comprehensive overview in the subjects of preparation, modification, and use of multiple sorts of graphene in the forms of neat, combined layers, and composite coatings on numerous metals. All performance parameters are given in detail. Chronological order of the article serves the purpose to give the reader a clear picture and an important clue on viability of strategies in the aspects of environmental friendliness, attainable maximum durability, and performance of corrosion protection with graphene films, as well as further advancements in the field expected to occur in the near future.

Growth of Anodized Layer and Cerium Sealing on Al7xxx/SiC Composite

2015 ◽  
Vol 1119 ◽  
pp. 212-217
Author(s):  
Badrul Munir ◽  
Vika Rizkia ◽  
Johny W. Soedarsono ◽  
Bambang Suharno ◽  
Andi Rustandi
Keyword(s):  
Oxide Layer ◽  
Current Density ◽  
Room Temperature ◽  
Composite Layer ◽  
Protective Layer ◽  
Anodic Oxide ◽  
Anodic Film ◽  
Micro Cracks ◽  
Density Values ◽  
Anodic Oxide Layer

Anodizing process conducted in Al7xxx/SiC produced non-uniform thickness of porous anodic film with cavities, micro-pores and micro-cracks. Cerium sealing was chosen as a post treatment to remedy the poor anodic film by providing a composite layer in order to further enhance the corrosion resistance in aggressive environment. In this study, anodizing process was conducted in H2SO4solution at current density values of 15, 20, and 25 mA/cm2at room temperature, 0°C and-25°C for 30 minutes. Subsequently, electroless sealing was conducted in CeCl3.6H2O + H2O2solution at room temperature and pH 9 for 30 minutes. Integrated protection composed of anodizing at 0°C and cerium sealing process in Al7xxx/SiC produced cerium rich deposits in the diameter of 64 nm (± 3nm) on the surface of anodic oxide layer. These spherical deposits covered the entire surface of anodic oxide layer in accordance with the morphology of the oxide layer. Otherwise, almost no cerium deposit formed on the surface of the oxide layer by conducted integrated protection at room temperature and-25°C. The integrated process conducted at anodizing temperature of 0°C presented a highest protection degree. The cerium protective layer which leads to the decreasing of corrosion rate and current density up to 99,99% or four orders magnifications than that of bare composite.

The composition of an anodic oxide layer on titanium

1965 ◽  
Vol 16 (8) ◽  
pp. 1213-1214 ◽  
Author(s):  
M Fox ◽  
R H Hanson ◽  
B S Munro
Keyword(s):  
Oxide Layer ◽  
Anodic Oxide ◽  
Anodic Oxide Layer
Sign in / Sign up

Export Citation Format

Share Document