Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 32, Issue 9, Pages 1111-1121Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-019-00900-8
Keywords
Impedance spectroscopy; Magnesium alloy; Corrosion resistance; Electrodeposition; Hydrophobic coating
Categories
Funding
- National Natural Science Foundation of China [51272055, 51501050]
- Science and Technology Innovation Fund of Shanxi Agricultural University [2017YJ14]
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A calcium stearate-based hydrophobic coating was formed on an anodized magnesium alloy by the electrodeposition method. The influences of the working voltages on the characteristics of the coatings were researched. The results indicate that the working voltages have significant effects on the morphology, thickness, roughness, and wettability of the hydrophobic coatings, but little influence on the phase composition. Higher working voltages promote the nucleation of the coatings during the deposition process. The thickness, roughness, and water contact angle of the coatings increase with the increase in working voltage. In addition, the influences of the working voltages on the corrosion properties and corrosion mechanisms of the coated magnesium alloys are discussed in detail. When the working voltage is 50V, the best corrosion resistance is obtained, but when the working voltages are 20V and 100V, respectively, a low corrosion resistance is obtained because of the presence of the thinner and cracked coating on the substrate surfaces.
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