Abstract
The synergistic inhibitory effect of stearic acid and (+)-α-tocopherol (E307) as a green inhibitor within a highly hydrophobic layer on the corrosion of low-carbon ferritic stainless steels was investigated in 3.0 wt% NaCl solution at 25 °C, focusing on long-term immersion tests. For a broader characterisation of the surface properties, especially the modified surfaces, of the samples used, the following methods were chosen: SEM was used to investigate the surface morphologies, the water contact angle to examine the wettability, while the corrosion resistance was investigated by potentiodynamic measurements and electrochemical impedance spectroscopy. The inhibition efficiency for modified ferritic stainless steel surfaces reached more than 99% after 1 h of immersion and remained the same after 5 days immersion testing when the surfaces were modified with (SA + 2.0 wt% E307) and more than 97% with (SA + 0.5 wt% E307) under the same test conditions.
Highlights
Despite a variety of new materials, different surface treatments such as plasma or laser surface treatment, and the development of different types of protective coating, corrosion remains a widespread problem at the top of the damage scale
Modified surfaces of SS AISI 410S in an ethanolic solution of SA with and without the addition of E307 exhibited a hydrophobic protective layer structured as a hierarchical flower-like cluster
Of all the techniques used in this work, the presence of (+)-α-tocopherol (E307) in the as-prepared hydrophobic flower structured protective layer caused a notable increase in the corrosion inhibition properties of the modified surface of SS AISI 410S in a solution of 3.0 wt% NaCl
Summary
Despite a variety of new materials, different surface treatments such as plasma or laser surface treatment, and the development of different types of protective coating, corrosion remains a widespread problem at the top of the damage scale. The result showed that the stable superhydrophobic ZnAl-LDH-La film was able to efficiently protect the underlying Al substrate for a long time, up to one month in 3.5 wt% NaCl solution Ke and his group [58] investigated a surface functionalisation approach that utilises the chemical adsorption and autopolymerisation effects of 1H, 1H, 2H, 2H perfluorodecyltriethoxysilane (FAS-17) to build a highly stable barrier coating against water and further equip it with highly reactive aluminium nanoparticles with long-term storage stability and self-activation reactivity. In addition to their unique properties, these metals have some limitations, with corrosion being one of them, the use of different types of coating is one of the effective strategies for protecting them. Germany. - Scanning electron microscope (SEM): FEI Sirion 400 NC, Eindhoven, Netherlands. - Goniometer: Data Physics OCA 35, Filderstadt, Germany
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