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Corrosion Resistance of Plasma Electrolytic Oxidation Coatings on LD7 Alloy in Oxalate and Dihydrogen Phosphate Electrolytes

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Two plasma electrolytic oxidation (PEO) coatings were fabricated on LD7 aluminum alloy in oxalate and dihydrogen phosphate electrolytes. The phase composition, morphology and corrosion resistant of the two PEO coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical test. Both PEO coatings presented three-layer structure, i.e., a porous outer layer, a relative dense intermediate layer with nano-size micro-pores and an inner nanoscale barrier layer at the coating/substrate interface. It was found that the porosity of the coating in oxalate electrolyte was lower than that in dihydrogen phosphate electrolyte. The small quantity of the nanosize micro-pores might be attributed to the appearance of “soft spark” in oxalate electrolyte, whereas the large number of micro-pores and cracks should be related to intensive micro-discharges in dihydrogen phosphate electrolyte during PEO process. The compact coating with nano-size micropores in oxalate electrolyte provided better protection than that in dihydrogen phosphate electrolyte from corrosion.
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Keywords: Corrosion Resistance; Electrolyte; LD7 Aluminum Alloy; Nano-Size Pore; Plasma Electrolytic Oxidation

Document Type: Research Article

Affiliations: 1: College of Materials Science and Engineering, Harbin Engineering University, Harbin 150001, China 2: Corrosion and Protection Division, Institute of Metal, Shenyang National Laboratory for Materials Science, Shenyang 110016, China 3: Fujian Longxi Bearing (Group) Corporation Limited, Zhangzhou 363000, China

Publication date: January 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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