Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings

Barik, R.C.; Wharton, J.A.; Wood, R.J.K.; Stokes, K.R.; Jones, Richard L.

doi:10.1016/j.surfcoat.2004.09.038

Cited by 190 publications

(80 citation statements)

References 13 publications

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“…The PEO alumina coating did offer higher erosion-corrosion resistance at relatively low impingement energies compared with either cast or HVOF sprayed nickel aluminium bronze surfaces. This superior performance of the PEO coating is probably due to its being 3-6 times harder, Barik et al [73].…”

Section: Plasma Electrolytic Oxidation (Peo) Coatingsmentioning

confidence: 99%

Tribo-corrosion of coatings: a review

Wood¹

2007

J. Phys. D: Appl. Phys.

230

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This paper reviews the available literature relating to the emerging research into the performance of coatings under combined wear and corrosion conditions. Understanding how coatings perform under these tribo-corrosion conditions is essential if the service life of equipment is to be predicted and to allow service life to be extended. Therefore, the tribo-corrosion performance of coatings deposited by a variety of techniques is discussed and the main mechanisms associated with their degradation under combined wear and corrosion highlighted. Coating composition, microstructure, defect level, adhesion, cohesion and substrate properties are seen as some of the critical elements in coating performance when subjected to tribo-corrosion contacts. The importance of post-coating deposition treatments such as laser resurfacing and sealing are also discussed. Interactions between wear and corrosion mechanisms are identified along with some models and mapping techniques that aim to inform coating selection and predict performance. Recent investigations into mono-layer as well as multilayered and functionally graded coatings are reviewed as candidates for wear-corrosion resistant surfaces. The review reveals the need for a more considered approach to tribo-corrosion testing and the way in which the results are analysed and presented. For example, the test conditions should be appropriate to the coating system under test; the level of in situ instrumentation deployed and the post-test analysis of in situ electrochemical data should be carefully selected as well as details given of the composition of any surface tribofilms formed and the identification of the degradation mechanisms.

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Section: Plasma Electrolytic Oxidation (Peo) Coatingsmentioning

confidence: 99%

Tribo-corrosion of coatings: a review

Wood¹

2007

J. Phys. D: Appl. Phys.

230

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“…The 24 h plot exhibits a slightly different behavior (i.e., a flat tail) more representative of finite-length diffusion (as shown in Figure 5 (b)) and suggests that there is less open porosity making the diffusion process slow and difficult. These porosity results show that the accumulation of corrosion products in the pore network, which will have the effect of blocking the difficult channels [19]. sion time the phase angle decreased corresponding to the higher frequency range of 1 MHz, but phase angle slightly varies in 0.5 M NaCl in the range of 85-95 ∘ due to the concentration of the solution, which means that the coating porosity increases during exposure to the corrosive solution.…”

Section: Parameters Specimen Uncoated 304 Ssmentioning

confidence: 81%

Corrosion studies of DC reactive magnetron sputtered alumina coating on 304 SS

Thangaraj¹,

Mahadevan²

2017

Electrochemical Energy Technology

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Aluminum oxide films on SS 304 deposited by DC reactive magnetron sputtering technique were studied with respect to the composition of the sputter gas (Ar:O 2 ), gas pressure, substrate temperature, current etc. to achieve good insulating films with high corrosion resistance. The films were characterized by XRD and SEM techniques. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements were made under static conditions in order to evaluate the corrosion performance of the alumina-coated SS 304 for various immersion durations in 0.5 M and 1 M NaCl solution. Alumina-coated SS 304 has low corrosion value of 0.4550 and 1.1090 MPY for 24 h immersion time in both solutions. The impedance plots for the alumina coated SS 304 in 1 M NaCl solution at different durations are slightly different to when compared to its immersion in 0.5 M NaCl solutions and are composed of two depressed semi circles. For the alumina coated film, the impedance spectrum decreased, when immersion time increased.

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“…The Warburg arc shrinkage is clearly observable in the Nyquist plot of the 15 vol. % CG bimodal sample (Figure 6a) and can be attributed to the blockage of the pores in the outer coarse layer by the accumulation of corrosion products [49].…”

Section: Resultsmentioning

confidence: 99%

Significant Corrosion Resistance in an Ultrafine-Grained Al6063 Alloy with a Bimodal Grain-Size Distribution through a Self-Anodic Protection Mechanism

Oskooie

Asgharzadeh

Sadighikia

et al. 2016

Metals

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Abstract:The bimodal microstructures of Al6063 consisting of 15, 30, and 45 vol. % coarse-grained (CG) bands within the ultrafine-grained (UFG) matrix were synthesized via blending of high-energy mechanically milled powders with unmilled powders followed by hot powder extrusion. The corrosion behavior of the bimodal specimens was assessed by means of polarization, steady-state cyclic polarization and impedance tests, whereas their microstructural features and corrosion products were examined using optical microscopy (OM), scanning transmission electron microscopy (STEM), field emission scanning electron microscopy (FE-SEM), electron backscattered diffraction (EBSD), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) techniques. The bimodal Al6063 containing 15 vol. % CG phase exhibits the highest corrosion resistance among the bimodal microstructures and even superior electrochemical behavior compared with the plain UFG and CG materials in the 3.5% NaCl solution. The enhanced corrosion resistance is attributed to the optimum cathode to anode surface area ratio that gives rise to the formation of an effective galvanic couple between CG areas and the UFG matrix. The operational galvanic coupling leads to the domination of a "self-anodic protection system" on bimodal microstructure and consequently forms a uniform thick protective passive layer over it. In contrast, the 45 vol. % CG bimodal specimen shows the least corrosion resistance due to the catastrophic galvanic corrosion in UFG regions. The observed results for UFG Al6063 suggest that metallurgical tailoring of the grain structure in terms of bimodal microstructures leads to simultaneous enhancement in the electrochemical behavior and mechanical properties of passivable alloys that are usually inversely correlated. The mechanism of self-anodic protection for passivable metals with bimodal microstructures is discussed here for the first time.

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Corrosion, erosion and erosion–corrosion performance of plasma electrolytic oxidation (PEO) deposited Al2O3 coatings

Cited by 190 publications

References 13 publications

Tribo-corrosion of coatings: a review

Tribo-corrosion of coatings: a review

Corrosion studies of DC reactive magnetron sputtered alumina coating on 304 SS

Significant Corrosion Resistance in an Ultrafine-Grained Al6063 Alloy with a Bimodal Grain-Size Distribution through a Self-Anodic Protection Mechanism

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