Surface Morphology and Anticorrosion Properties of Zinc Phosphate Coating Deposited with Various Concentrations of Zinc Oxide
DOI:
https://doi.org/10.58987/xecxnm05Keywords:
Phosphating, Zinc phosphate, Corrosion, Metal protectionAbstract
In this investigation, the influence of zinc oxide concentration on the microstructural evolution and corrosion resistance of zinc phosphate coating formed on mild steel was studied. Phosphate layers were deposited from phosphating bath containing different concentrations of zinc oxide (1.25 ~ 10 g/L). The surface morphology and composition of phosphate coatings were investigated via scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). Corrosion behavior of the formed coatings was evaluated using immersion test in a 3.5% NaCl solution and salt spray test in 5% NaCl. The results showed that the increase in zinc oxide content facilitated the precipitation of phosphate coating and increased its surface coverage. Immersion test results revealed that the corrosion resistance of the phosphate coatings was markedly improved as the zinc oxide concentration increased. However, the salt spray test results showed that the underfilm corrosion of phosphated-painted steel was increased as the zinc oxide content increased to high levels. The best underfilm corrosion performance was observed for the coatings obtained with phosphating bath containing 2.5 and 3.5 g/L of zinc oxide. This behavior indicates that low zinc phosphate coating serves as a good pretreatment process for subsequent organic painting finishes.
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Copyright (c) 2024 A. A. Alfasi , Walid S. Muhammad , K. Abdalla (Author)
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