Journal
MATERIALS RESEARCH EXPRESS
Volume 6, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab194c
Keywords
magnesium alloy; corrosion protection; zinc phosphate conversion coating; ZnO nanoparticle
Categories
Funding
- National Natural Science Foundation of China [51571102, 51871111, 51701081]
- Natural Science Foundation of Shandong Provincial, China [ZR2017BEM001, ZR2018LE001, ZR2017BB002]
- Shandong Association for Science Technology [301-1505001]
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In this work, micron and nano ZnO powders were used to assist in the formation of zinc phosphate coatings to improve the corrosion resistance of AZ91D magnesium alloy, respectively. The results showed that the ZnO particles acted as the nucleation sites to promote the formation of flower-like Zn-3(PO4)(2)center dot 4H(2)O phase, which was the main component of the zinc phosphate conversion coatings. In addition, the micron ZnO-assisted zinc phosphate conversion coatings (MACC) reduced the corrosion rate of AZ91D alloy from 3.36 to 3.20 mm.a(-1). Besides, the corrosion resistance nano ZnO-assisted zinc phosphate conversion coating (NACC) was four times as high as that of MACC, due to that the NACC had the finer grains and more compact structure. The more compact structure resulted from that the nano ZnO particles not only increased the number of nucleation sites but also decreased the concentration of Zn2+ in the phosphatization solution to inhibit the growth of Zn-3(PO4) (2)center dot 4H(2)O phase.
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