Superhydrophobic films-based nonanyl carboxy methylcellulose grafted polyacrylamide for AISI-stainless steel corrosion protection: Empirical explorations and computational models
By El-Lateef, Hany M. Abd; Gouda, M.; Shalabi, K.; Al-Omair, Mohammed A.; Khalaf, Mai M.
Published in Journal of Molecular Liquids
2022
Abstract
The current work offers an alternate environmental and facile technique to fabricate a thin coating based on the superhydrophobic film of Nonanyl carboxy methylcellulose grafted polyacrylamide (NCMC-g-PAAm-SB) which could be applied as protective layers for AISI-stainless steel corrosion. FTIR and FESEM apparatuses were used to characterize the synthesized NCMC-g-PAAm-SB. Furthermore, water uptake measurements were tested to prove the hydrophobicity character of NCMCPAAm. The thermal permanence of the NCMC-g-PAAm-SB was detected by thermo-gravimetric examination (TGA) display thermal steadiness up to 250 °C. The anticorrosive performance of the pristine and coated AISI-steel was estimated in a combination of diverse chloride solution, 3.5% NaCl + 1.0 M HCl. PDP, EIS, and potential-time experiments were performed to assess the corrosion protection features. Moreover, LPR corrosion rate tests were completed for the long-term to determine the stability of coating films in the corrosive medium. The impact of the film thickness (number of coating layers) on the corrosion characteristics was inspected. The total polarization resistance increased to 1560.3 Ω cm2 for AISI-steel coated with the NCMC-g-PAAm-SB five layers compared to 55.8 Ω cm2 for pristine AISI-steel, displayed outstanding anticorrosion behavior with 96.4% of protection capacity. FESEM was utilized to describe the surface topology of the uncoated and coated AISI-steel samples before and after exposure in the aggressive medium. The computational models were accomplished to extremely examine the corrosion protection coating mechanism of AISI-steel. Owing to their remarkable physicochemical characteristics, such superhydrophobic films are an economically and innovative accessible substitute to progress the stainless of AISI-steel corrosion resistance and can be utilized in steel protection in acidic chloride environments.