A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

Shao, Lianlian; Li, Hongtao; Jiang, Bailing; Liu, Cancan; Gu, Xin; Chen, Dichun

doi:10.3390/met8030165

Cited by 32 publications

(20 citation statements)

References 27 publications

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“…Meanwhile, the original micro-cracks became widened, which was more conducive to the penetration of the salt solution [29,30]. The corrosion progress largely depended on the protective effect of the dense inner layer of the MAO coating [15]. When salt spray arrived at the interface between MAO coating and substrate, the latter began to suffer corrosion because of its high chemical activity.…”

Section: Discussionmentioning

confidence: 99%

“…In other words, it appears that the solution flowed along the micro-cracks and penetrated gradually into the substrate. The advancement of corrosion thus seems to depend on the protective effect of the inner dense layer of the MAO coating [12,15].…”

Section: Neutral Salt Spray Test (Nsst)mentioning

confidence: 99%

“…Various methods are applied to evaluate the corrosion resistance of MAO coatings on Al alloys, such as electrochemical corrosion, immersion or salt spray tests [12][13][14]. Among these methods, the neutral salt spray test (NSST) is one of the most common and simple means to assess the corrosion performance [14][15][16]. However, much attention was paid to the consequences of the salt spray test, whereas relatively neglected to trace the corrosion sequential process and observe corrosion channels induced during the salt spray test [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, the neutral salt spray test (NSST) is one of the most common and simple means to assess the corrosion performance [14][15][16]. However, much attention was paid to the consequences of the salt spray test, whereas relatively neglected to trace the corrosion sequential process and observe corrosion channels induced during the salt spray test [14][15][16]. These were owing to the fact that most corrosion channels were locally destroyed due to the formation of corrosion products during the NSST.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

Liu

Hai-long

et al. 2020

Mater. Res. Express

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Micro-arc oxidation (MAO) coating was initially prepared on 6061 Al alloy, and subsequently coated with Ag using magnetron sputtering. Laser beam scan (LBS) treatments were then applied to infiltrate the sputtered Ag into the MAO coating in order to simulate the corrosion behaviour of the MAO coating during the neutral salt spray test (NSST). Cross-sectional morphologies and Ag element distribution maps were studied by using the field emission scanning electron microscopy (FESEM) on the MAO-Ag coated samples after LBS infiltration. The results showed that there existed the microcracks with tree-root or lightning shape within the MAO coating. Interconnected aggregates, including micro-pores, large cavities far beneath the surface and tree-root like micro-cracks, served as complex corrosion channels during salt spray corrosion. Through these corrosion channels, the salt spray penetrated gradually into the interface between the MAO coating and the original Al substrate, thus causing corrosion of the Al substrate during the NSST. The LBS treatment is presented as a method to explore the subtle micro-crack and pore channels associated to the MAO coating and to provide information that paves the way towards understanding of corrosion phenomena in these porous systems.

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Section: Discussionmentioning

confidence: 99%

Section: Neutral Salt Spray Test (Nsst)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

Liu

Hai-long

et al. 2020

Mater. Res. Express

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“…Comparison of corrosion resistance for PEO coatings on pure aluminum and alloys substrate in literature[63][64][65][66].…”

mentioning

confidence: 99%

Effects of Processing Parameters on the Corrosion Performance of Plasma Electrolytic Oxidation Grown Oxide on Commercially Pure Aluminum

Mengesha

Chu

Lou

et al. 2020

Metals

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The plasma electrolyte oxidation (PEO) process has been considered an environmentally friendly surface engineering method for improving the corrosion resistance of light weight metals. In this work, the corrosion resistance of commercially pure Al and PEO treated Al substrates were studied. The PEO layers were grown on commercially pure aluminum substrates using two different alkaline electrolytes with different addition concentrations of Si 3 N 4 nanoparticles (0, 0.5 and 1.5 gL −1 ) and different duty cycles (25%, 50%, and 80%) at a fixed frequency. The corrosion properties of PEO coatings were investigated by the potentiodynamic polarization and electrochemical impedance spectroscopy test in 3.5 wt.% NaCl solutions. It showed that the weight gains, layer thickness and surface roughness of the PEO grown oxide layer increased with increasing concentrations of Si 3 N 4 nanoparticles. The layer thickness, surface roughness, pore size, and porosity of the PEO oxide layer decreased with decreasing duty cycle. The layer thickness and weight gain of PEO coating followed a linear relationship. The PEO layer grown using the Na 2 B 4 O 7 ·10H 2 O contained electrolyte showed an excellent corrosion resistance and low surface roughness than other PEO coatings with Si 3 N 4 nanoparticle additives. It is noticed that the corrosion performance of PEO coatings were not improved by the addition of Si 3 N 4 nanoparticle in the electrolytic solutions, possibly due to its detrimental effect to the formation of a dense microstructure.Metals 2020, 10, 394 2 of 21 hardness restrict their wider application in crucial environments [1,2]. One of the efficient approaches to improve these disadvantages of aluminum is by surface modification for enhancing its anticorrosion performance, such as plasma electrolytic oxidation (PEO), ion implantation, laser surfacing, diffusion treatment, thermal spraying, physical vapor deposition (PVD), chemical vapor deposition (CVD) and conversion coatings such as anodizing, etc. Among several kinds of surface modification techniques, PEO is one of the most promising surface treatment methods [3], because it is an environmentally friendly and cost-effective technique for surface engineering and a suitable method for producing thick, hard and dense ceramic coatings on light metals.PEO, also known as micro-arc oxidation (MAO) [4], is an electrochemical induced plasma surface treatment process for creating oxide ceramic coatings on light metals [5,6]. PEO is a relatively new surface modification technique which can significantly improve the hardness, corrosion and wear resistance, adhesion strength, thermal and other desirable properties of Al alloys by efficiently growing thick alumina rich ceramic coatings [7][8][9][10]. During this process, plasma discharge can cause the formation of a highly adhesive and dense oxide layer on the substrate [11,12]. PEO is also considered an environmentally friendly and cost-effective coating process with real industrial applications [3,[13][14][15][16][17][18]. Several par...

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Effect of Morphological Features on Dielectric Properties of Plasma Electrolytic Oxidation Coatings on D16T Aluminum Alloy

Севидова

Pupan

Gutsalenko

et al. 2020

Advances in Design, Simulation and Manufacturing III

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A Comparative Study of Corrosion Behavior of Hard Anodized and Micro-Arc Oxidation Coatings on 7050 Aluminum Alloy

Cited by 32 publications

References 27 publications

Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

Simulation of salt spray corrosion behaviour of micro-arc oxidation coating by laser induced Ag infiltration

Effects of Processing Parameters on the Corrosion Performance of Plasma Electrolytic Oxidation Grown Oxide on Commercially Pure Aluminum

Effect of Morphological Features on Dielectric Properties of Plasma Electrolytic Oxidation Coatings on D16T Aluminum Alloy

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