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In situ fabrication of blue ceramic coatings on wrought Al Alloy 2024 by plasma electrolytic oxidation
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Image of FIG. 1.
FIG. 1.

(Color online) Macro- (a) and micromorphologies (b) as well as a cross-sectional micrograph of the prepared ceramic coating sample 4.

Image of FIG. 2.
FIG. 2.

XRD pattern of the PEO ceramic coating sample 4 prepared with T on = 400 μs and T off = 100 μs.

Image of FIG. 3.
FIG. 3.

(Color online) Surface morphology of the blue ceramic coating at high magnification (a), and the corresponding EDX surface analysis (b) and (c) on the position marked in (a) as M and N, respectively.

Image of FIG. 4.
FIG. 4.

(Color online) Schematic illustration of the discharge models for the PEO process for an Al sample (modified from Ref. 20).

Image of FIG. 5.
FIG. 5.

(Color online) Macro- and micromorphologies of three kinds of samples. (a) sample 1, (b) sample 2, and (c) sample 3.

Image of FIG. 6.
FIG. 6.

(Color online) Polarizing curves of the blue ceramic coating sample 4, anodic film, and aluminum substrate in an aerated 3.5 wt. % NaCl solution.

Image of FIG. 7.
FIG. 7.

Cross-section morphologies of (a) blue ceramic coating sample 4 after subjected for 120 times of thermal cycling, (b) anodic film after suffered for one time thermal cycling and (c) anodic film after subjected for 10 times thermal cycling.

Image of FIG. 8.
FIG. 8.

(Color online) SEM micrographs of wear tracks (between arrows) on (a) uncoated Al substrate, (b) anodic film coated sample, and (c) blue ceramic coating coated sample.


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Sample number and corresponding PEO processing current mode as well as their appearance.

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Results of potentiodynamic corrosion tests of the samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In situ fabrication of blue ceramic coatings on wrought Al Alloy 2024 by plasma electrolytic oxidation