Microstructure and Corrosion Performance of Silica Coatings on Aluminum Surface Prepared by Plasma Electrolysis Technique
Publish Year: 1388
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJE-22-3_008
تاریخ نمایه سازی: 18 بهمن 1400
Abstract:
Silica phases were precipitated on aluminum surface by potentiostatic plasma electrolysis technique. Aqueous sodium silicate solutions with different concentrations were used for this purpose. SEM, EDS, XRD, surface profiles and polarization curves were used to study coatings properties. The results showed that the growth of the silica containing phases on aluminum surface was promoted by increasing sodium silicate content of the electrolyte. However, in very high concentration solutions, the morphology of the oxide films changed and the roughness of the coating increased. Moreover, the amorphous compounds were substituted for crystalline phases. Coated specimens showed high corrosion resistance in ۳.۵ % NaCl media.
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Authors
Maryam Ehteshamzadeh
Materials Engineering, Shahid Bahonar University of Kerman
Davood Salehi Doolabi
Materials Engineering, SBUK
Mahdi Asadi Zarch
Materials Engineering, Islamic Azad University of Yazd