Effect of Citric Acid on Cerium Conversion Coating of Hot-Dip Galvanized Steel

Zhang, Shuang Hong; Yang, Bo; Li, Mao Dong; Zhai, Wei; Wang, Zhi Gang; Li, Shuang

doi:10.4028/www.scientific.net/kem.814.144

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…[5,6,8]. In order to increase the corrosion resistance of the resulting cerium films, the addition of various compounds to the basic passivation compositions including Na2SO4, NaNO3, citric acid and some organic additives such as 2-butene 1,4 diol propoxylate has been investigated [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the inhibiting effect of environmentally friendly cerium-containing conversion films on the corrosion of zinc coatings

Peshova,

Bachvarov

2024

J. Phys.: Conf. Ser.

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In the present work, the inhibiting effect of environmentally friendly cerium and phosphorus-based conversion films on zinc corrosion in 5% NaCl and 1 N Na2SO4 test media was investigated. The films were prepared by immersion and stirring in the passivating/converting solution for time periods of 3,5,7, 10 min., respectively. The chemical composition of the films was determined by EDX analysis. The results of the electrochemical studies showed that in 5% NaCl medium, cerium- and phosphorus-based films exhibited high inhibition effect only during the first days of polarization resistance (Rp) measurement. In 1 N Na2SO4 medium, the Rp of the conversion films was up to 2.5 times higher than that of pure zinc coatings throughout the test period.

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