Study on phosphating treatment of aluminum alloy: role of yttrium oxide
作者： Shenglin ZHANG
DOI: 10.1016/S1002-0721(08)60271-9
关键词: Oxide 、 Materials science 、 Phosphate 、 Scanning electron microscope 、 Coating 、 Zinc phosphate 、 Corrosion 、 Yttrium 、 Alloy 、 Inorganic chemistry
摘要: Abstract Zinc phosphate coatings formed on 6061-Al alloy, after dipping in phosphating solutions containing different amounts of Y 2 O 3 (yttrium oxide), were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical measurements. Significant variations the morphology corrosion resistance afforded zinc coating especially observed as solution varied from 0 to 40 mg/L. The addition changed initial potential interface between aluminum alloy substrate increased number nucleation sites. thereby was less porous structure covered surface completely within short time. Phosphate mainly composed Zn (PO 4 ) ·4H (hopeite) AlPO (aluminum phosphate). , an additive phosphatization, accelerated precipitation refined gain size coating. 3% NaCl improved shown polarization measurement. In present research, optimal amount 10–20 mg/L, time 600 s.
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