The corrosion and protection characteristics of phosphate coatings formed on aluminum alloy (AA)6061 (UNS A96061) in a phosphating solution containing mainly zinc oxide (ZnO), phosphoric acid (H3PO4), and sodium fluoride (NaF), using yttrium oxide (Y2O3) as additive, were investigated through scanning electron microscopy (SEM), polarization curves, electrochemical impedance spectroscopy (EIS) diagrams, the salt water immersion test, and the adhesion test. The results show that the corrosion and protection of phosphate coatings have been improved when Y2O3 is added to the phosphating solution, making the free corrosion potential shift to the positive direction and corrosion current to decrease. The phosphate coatings formed in the phosphating solution with 10 mg/L and 20 mg/L Y2O3 have finer crystal structures, and they exhibit better corrosion resistance and adhesion than those with 0 or 40 mg/L Y2O3.
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1 January 2008
Research Article|
January 01 2008
Corrosion and Protection Characteristics of Phosphate Coatings on Aluminum Alloy 6061 Using Yttrium Oxide as Additive
S.-L. Zhang;
S.-L. Zhang
‡
*School of Mechanical, Electronic, and Information Engineering, China University of M&T, Beijing 100083,
China
.‡Corresponding author. E-mail: [email protected].
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H.-H. Chen;
H.-H. Chen
*School of Mechanical, Electronic, and Information Engineering, China University of M&T, Beijing 100083,
China
.
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X.-L. Zhang;
X.-L. Zhang
**School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450052,
China
.
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M.-M. Zhang
M.-M. Zhang
***Chemistry and Environmental Science College, Henan Normal University, Xinxiang, Henan 453007,
China
.
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‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2008
CORROSION (2008) 64 (1): 30–34.
Citation
S.-L. Zhang, H.-H. Chen, X.-L. Zhang, M.-M. Zhang; Corrosion and Protection Characteristics of Phosphate Coatings on Aluminum Alloy 6061 Using Yttrium Oxide as Additive. CORROSION 1 January 2008; 64 (1): 30–34. https://doi.org/10.5006/1.3278458
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