Synthesis of natural glucomannan derivative as a highly-efficient green inhibitor for mild steel in the simulated seawater

In-Depth Insight into Corrosion Inhibition Performance of Sweet Potato Leaf Extract as a Green and Efficient Inhibitor for 6N01 Al Alloy in the Seawater: Experimental and Theoretical Perspectives

“…This suggests an excess of negative charges on the surface of the Al alloy, facilitating the adsorption of SPL. The aforementioned results reveal that there are rich −NH 2 and −OH groups in the components of SPL (Figure S2), which are easily protonated in the acidic solution . Therefore, the protonated species could comfortably adsorb on the Al alloy surface by the electrostatic force, thus generating the physical adsorption .…”

“…Weight loss method as a simple and efficient technology has been widely applied to determine the corrosion inhibition behavior. 17 The results obtained by the weight loss method are displayed in Figure 2. Accompanied by the addition of SPL to the seawater, the corrosion rate (C R ) of the 6N01 Al alloy sharply reduces (Figure 2a), suggesting that the corrosion of the 6N01 Al alloy is severely inhibited by SPL.…”

“…The aforementioned results reveal that there are rich −NH 2 and −OH groups in the components of SPL (Figure S2), which are easily protonated in the acidic solution. 17 Therefore, the protonated species could comfortably adsorb on the Al alloy surface by the electrostatic force, thus generating the physical adsorption. 60 In addition, there are some N, O heteroatoms in the components of SPL (Figure S2), which can act as an electron donor to provide the electron to the vacant d-atomic orbital of the Al atom, forming inhibitor to metal and metal to inhibitor bond.…”

“…For example, Guo et.al reported that soybean extract as a green corrosion inhibitor exhibits about 93.2% of inhibition efficiency for carbon steel in sulfuric solution. 17 Li et al recently revealed that Lycium barbarum leaf was a biodegradable corrosion inhibitor with 94.1% of inhibition efficiency for copper in 0.5 M H 2 SO 4 solution at 400 mg L −1 by various electrochemical tests. 25 Liao et al first obtained the Acanthopanax senticosus leaf extract by a one-step pure water method and then investigated its corrosion inhibition performance for carbon steel in an acidic solution by various electrochemical measurements.…”

“…In recent years, corrosion inhibitors have garnered significant attention in the field of metal protection owing to their cost-effectiveness and high inhibition efficiency. Lots of organic heterocyclic compounds (i.e., triazole derivatives, imidazoline derivatives, Schiff bases) can be used as effective corrosion inhibitors. − These compounds contain some heteroatoms as well as polar groups, which are beneficial for adsorption on the metal surface. However, most of the traditional corrosion inhibitors possess some shortcomings, including being expensive, nonbiodegradable, and toxic, seriously limiting their large-scale application.…”