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Open AccessArticle

The Effect of Vanadate, Phosphate, Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions

1
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40502, USA
2
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1325; https://doi.org/10.3390/ma13061325
Received: 19 February 2020 / Revised: 7 March 2020 / Accepted: 12 March 2020 / Published: 14 March 2020
(This article belongs to the Special Issue Corrosion and Corrosion Protection for Light Metals/Alloys)
The anodic polarization response of magnesium alloy AZ31 was first characterized during exposure to aerated 0.1 M NaCl solutions with millimolar additions of NaVO3, Na3PO4, Na2HPO4, NaF and various pairings to assess their ability to inhibit corrosion kinetics and retard localized corrosion. Each of the candidate inhibitors reduced the corrosion rate of the alloy to some degree. A Na3PO4–NaVO3 pair produced a good inhibiting effect decreasing the corrosion rate to about 10−7 A/cm2, which was two orders of magnitude lower than the uninhibited control case. A Bliss Independence assessment indicated that this inhibitor pair acted synergistically. A Na2HPO4–NaVO3 pair reduced the corrosion rate to 10−6 A/cm2 but was not assessed to be acting synergistically. The NaVO3–NaF pair did not reduce the corrosion rate significantly compared to the control case and was an antagonistic pairing. SEM imaging showed film formation due to exposure, which appears to be the origin of the observed inhibition. The resistance to localized corrosion was assessed as the difference in the breakdown potential and the corrosion potential, with larger values indicating a lower probability of localized corrosion during free corrosion exposures. The effects of the inhibitors on this characteristic were mixed, but each of the inhibitor pairs yielded potential differences in excess of 100 mV. A conceptual conversion coating process based on a mixture of vanadate and phosphate compounds were demonstrated. A fluoride-bearing formulation produced coatings whose total impedance was increased by a factor of two compared to an uncoated control. A fluoride-free formulation produced coatings whose corrosion resistance was increased by more than a factor of three. View Full-Text
Keywords: light alloys; magnesium; corrosion; vanadate; phosphate; fluoride; inhibition; conversion coating light alloys; magnesium; corrosion; vanadate; phosphate; fluoride; inhibition; conversion coating
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MDPI and ACS Style

Feng, Z.; Li, J.; Yang, Z.; Buchheit, R. The Effect of Vanadate, Phosphate, Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions. Materials 2020, 13, 1325. https://doi.org/10.3390/ma13061325

AMA Style

Feng Z, Li J, Yang Z, Buchheit R. The Effect of Vanadate, Phosphate, Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions. Materials. 2020; 13(6):1325. https://doi.org/10.3390/ma13061325

Chicago/Turabian Style

Feng, Zhiyuan; Li, Jichao; Yang, Zi; Buchheit, Rudolph. 2020. "The Effect of Vanadate, Phosphate, Fluoride Compounds on the Aqueous Corrosion of Magnesium Alloy AZ31 in Dilute Chloride Solutions" Materials 13, no. 6: 1325. https://doi.org/10.3390/ma13061325

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