Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 12, Pages 3485-3494Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2021.03.012
Keywords
Phosphate conversion coating; Surface pre-activator; Magnesium alloy; Morphology; Corrosion
Categories
Funding
- National Key Research and Development Program of China [2017YFB0103904, 2016YFB0301105]
- National Natural Science Foundation of China [51804190]
- Youth Science Funds of Shandong Academy of Sciences [2020QN0022]
- Youth Innovation and Technology Support Program of Shandong Provincial Colleges and Universities [2020KJA002]
- Jinan Science & Technology Bureau [2019GXRC030]
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In this study, a phosphate conversion coating was prepared on a magnesium alloy by pre-activating it with phosphoric acid, oxalic acid, and colloidal Ti. The coating pre-activated by phosphoric acid showed the best corrosion resistance.
In this study, Mg-6.0Zn-3.0Sn-0.5Mn (ZTM630) magnesium alloy was pre-activated by colloidal Ti, oxalic acid, and phosphoric acid, and a phosphate conversion coating (PCC) was prepared on the alloy surface. The morphology and corrosion resistance of the prepared PCCs were investigated. Surface morphology studies showed that the phosphate crystals that formed the coating were the smallest for the sample pre-activated by phosphoric acid. The coating on the colloidal Ti and the phosphoric acid samples had the largest and the smallest thickness and surface roughness, respectively. The reason for the discrepancy was analyzed by comparing the surface morphologies of alloy samples immediately after the pre-activation treatment and various phosphating treatments. X-ray diffraction analysis revealed that all three PCCs contained the same compounds. The corrosion resistance time from the copper sulfate drop test and the electrochemical data from the potentiodynamic polarization curves showed that the coating pre-activated by phosphoric acid had the best corrosion resistance. Finally, the 1500 h neutral salt spray corrosion test confirmed that the phosphating treated magnesium alloy, which was pre-activated by phosphoric acid, exhibited excellent corrosion resistance and behavior. (c) 2021ChongqingUniversity. PublishingservicesprovidedbyElsevierB.V. onbehalfofKeAiCommunicationsCo. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer review under responsibility of Chongqing University
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