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Abstract

Characterization of Zinc Phosphate Coatings: Influence of pH and Temperature on Morphology and Corrosion Resistance †

by
Sheila Silva-Fernández
*,
Belén Díaz
and
X. Ramón Nóvoa
ENCOMAT Group, CINTECX, Campus Universitario As Lagoas Marcosende, Universidad de Vigo, 36310 Vigo, Spain
*
Author to whom correspondence should be addressed.
Presented at the First Corrosion and Materials Degradation Web Conference, 17–19 May 2021; Available online: https://cmdwc2021.sciforum.net/.
Mater. Proc. 2021, 6(1), 20; https://doi.org/10.3390/CMDWC2021-10051
Published: 14 May 2021
(This article belongs to the Proceedings of The 1st Corrosion and Materials Degradation Web Conference)

Abstract

:
Zinc phosphate coatings are commonly used to protect high-strength steel rods and improve the corrosion protection ability. The temperature and the pH of the phosphating bath are important parameters that affect to the film’s appearance, porosity, and composition. In this work, some variations in the phosphating solution have been analysed. In particular, the temperatures were modified in the range of 50–75 °C and the pH values were fixed at 2.4, 2.8 and 3. Phosphate coatings were investigated via scanning electron microscopy (SEM) and energy dispersive X-ray (EDX), which allow a complete surface analysis, including of both the morphology and the composition. The coating’s mass was also determined by the gravimetric method. For the corrosion resistance of the film, the linear polarization curves obtained in Na2SO4 0.1 M were analyzed. The results show that the phosphating baths at 60–65 °C and pH at 2.44 produce a thicker film, with the highest amount of Zn and improved corrosion resistance.
Keywords:
phosphate; corrosion; SEM

Supplementary Materials

The conference presentation file is available at https://www.mdpi.com/article/10.3390/CMDWC2021-10051/s1.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Silva-Fernández, S.; Díaz, B.; Nóvoa, X.R. Characterization of Zinc Phosphate Coatings: Influence of pH and Temperature on Morphology and Corrosion Resistance. Mater. Proc. 2021, 6, 20. https://doi.org/10.3390/CMDWC2021-10051

AMA Style

Silva-Fernández S, Díaz B, Nóvoa XR. Characterization of Zinc Phosphate Coatings: Influence of pH and Temperature on Morphology and Corrosion Resistance. Materials Proceedings. 2021; 6(1):20. https://doi.org/10.3390/CMDWC2021-10051

Chicago/Turabian Style

Silva-Fernández, Sheila, Belén Díaz, and X. Ramón Nóvoa. 2021. "Characterization of Zinc Phosphate Coatings: Influence of pH and Temperature on Morphology and Corrosion Resistance" Materials Proceedings 6, no. 1: 20. https://doi.org/10.3390/CMDWC2021-10051

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