Inhibitive characteristics of cetylpyridinium chloride and potassium chromate addition on type A513 mild steel in acid/chloride media

Linear polarization resistance and open circuit potential methods were used to assess the inhibitive and adsorption behaviour of Potassium chromate (K 2 CrO 4 ) and Cetylpyridinium chloride (CPC) on mild steel (MS) in HCl/NaCl solution. Results obtained show that K 2 CrO 4 and CPC inhibit MS signifi...

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Bibliographic Details
Published in:Cogent engineering 2017-01, Vol.4 (1), p.1318736
Main Authors: Fayomi, O.S.I., Popoola, A.P.I., Oloruntoba, T., Ayoola, A.A.
Format: Article
Language:English
Subjects:
Adsorption
Chloride resistance
Chromates
Corrosion
Corrosion effects
Corrosion inhibitors
Corrosion prevention
Corrosion products
Degradation
interfaces
Linear polarization
Low carbon steels
micrographs
mild steel
Open circuit voltage
passivation
Pitting (corrosion)
polarization
Potassium
Surface chemistry
Synergistic effect
Uniform attack (corrosion)
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Summary:Linear polarization resistance and open circuit potential methods were used to assess the inhibitive and adsorption behaviour of Potassium chromate (K 2 CrO 4 ) and Cetylpyridinium chloride (CPC) on mild steel (MS) in HCl/NaCl solution. Results obtained show that K 2 CrO 4 and CPC inhibit MS significantly against massive degradation. However, under open circuit potential method, inhibition efficiency of K 2 CrO 4 decreased at higher concentration. The synergistic effect of both inhibitors is positive on the protection of mild steel against corrosion. An inhibitive efficiency of over 60% was recorded for the combined admixture. Morphological study showed that the exposed steel with the presence of K 2 CrO 4 and CPC possess some corrosion product with lesser pitting effect compare to unprotected steel with severe surface deterioration and uniform corrosion degradation. The corrosion inhibition performance of K 2 CrO 4 and CPC on mild steel surface was found to follow Langmuir adsorption isotherm model.
ISSN:2331-1916
2331-1916
DOI:10.1080/23311916.2017.1318736